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Journal articles on the topic '3-c]pyridine-4-one'

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Published: 5 June 2025

Last updated: 1 August 2025

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1

Quiroga, Jairo, Yurina Díaz, Justo Cobo, and Christopher Glidewell. "Hydrogen-bonded assembly in six closely related pyrazolo[3,4-b]pyridine derivatives; a simple chain, three types of chains of rings and a complex sheet structure." Acta Crystallographica Section C Crystal Structure Communications 68, no. 1 (2011): o12—o18. http://dx.doi.org/10.1107/s0108270111050207.

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Six closely related pyrazolo[3,4-b]pyridine derivatives, namely 6-chloro-3-methyl-1,4-diphenylpyrazolo[3,4-b]pyridine-5-carbaldehyde, C20H14ClN3O, (I), 6-chloro-3-methyl-4-(4-methylphenyl)-1-phenylpyrazolo[3,4-b]pyridine-5-carbaldehyde, C21H16ClN3O, (II), 6-chloro-4-(4-chlorophenyl)-3-methyl-1-phenylpyrazolo[3,4-b]pyridine-5-carbaldehyde, C20H13Cl2N3O, (III), 4-(4-bromophenyl)-6-chloro-3-methyl-1-phenylpyrazolo[3,4-b]pyridine-5-carbaldehyde, C20H13BrClN3O, (IV), 6-chloro-4-(4-methoxyphenyl)-3-methyl-1-phenylpyrazolo[3,4-b]pyridine-5-carbaldehyde, C21H16ClN3O2, (V), and 6-chloro-3-methyl-4-(4-n

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2

Jones, Raymond C. F., Abdul K. Choudhury, James N. Iley, Mark E. Light, Georgia Loizou, and Terence A. Pillainayagam. "Aldol elaboration of 4,5,6,7-tetrahydroisoxazolo[4,3-c]pyridin-4-ones, masked precursors to acylpyridones." Beilstein Journal of Organic Chemistry 8 (February 27, 2012): 308–12. http://dx.doi.org/10.3762/bjoc.8.33.

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A core 4,5,6,7-tetrahydroisoxazolo[4,3-c]pyridine-4-one scaffold is elaborated at C-3(Me) by base-mediated aldol condensation to give new 3-alkenyl-4,5,6,7-tetrahydroisoxazolo[4,3-c]pyridine-4-ones, which are masked forms related to the acylpyridone natural products.

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3

Vishnupriya, R., J. Suresh, S. Maharani, and R. Ranjith Kumar. "C—H...O and C—H...N interactions in three hexahydrocycloocta[b]pyridine-3-carbonitriles." Acta Crystallographica Section C Structural Chemistry 70, no. 2 (2014): 236–40. http://dx.doi.org/10.1107/s2053229614000291.

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The structures of three new pyridine derivatives, 2-methoxy-4-(4-methoxyphenyl)-5,6,7,8,9,10-hexahydrocycloocta[b]pyridine-3-carbonitrile, C20H22N2O2, (I), 2-ethoxy-4-(3-nitrophenyl)-5,6,7,8,9,10-hexahydrocycloocta[b]pyridine-3-carbonitrile, C20H21N3O3, (II), and 2-ethoxy-4-(4-methoxyphenyl)-5,6,7,8,9,10-hexahydrocycloocta[b]pyridine-3-carbonitrile, C21H24N2O2, (III), differ in the nature of the substituents either at the 2-position of the central pyridine ring or on the pendent aryl ring. This simple change in the structure substantially alters the intermolecular interaction patterns. The sub

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4

M., B. Deshmukh, A. Deshmukh S., S. Jagtap S., W. Suryavanshi A., Jadhav S.D., and V. Anbhule P. "Synthesis and antimicrobial activity of pyridopyrazole and pyrazolo[3,4-d]dihydrothiazole." Journal of Indian Chemical Society Vol. 86, Jun 2009 (2009): 613–16. https://doi.org/10.5281/zenodo.5811785.

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Department of Chemistry, Shivaji University, Kolhapur-416 004, Maharashtra, India <em>E-mail</em>: m_deshmukhl@rediffmail.com <em>Manuscript received 30 July 2007, revised 2 January 2009, accepted 27 February 2009</em> 6-Methyl-1,3-dihydro-4<em>H,</em>7<em>H</em>-pyrazolo[2,3-c)pyridine-4-one (4) were synthesized by microwave as well as conventional method. The reaction time reduced 10 times than that of conventional method. The pyrazolo[3,4-<em>d</em>]dihydrothiazole (8) were synthesized by reacting phenylisothiocyanate with 1-carbethoxy-5-amino-pyrazol-4-ene-3- one and were screened for thei

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5

Hrašna, Martin, Eva Ürgeová, and Alžbeta Krutošíková. "Synthesis, Complex Compounds and Antimicrobial Activity of Some Derivatives of Furo[3,2-C]Pyridine and Their Starting Compounds." Nova Biotechnologica et Chimica 11, no. 1 (2012): 73–85. http://dx.doi.org/10.2478/v10296-012-0008-x.

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Synthesis, Complex Compounds and Antimicrobial Activity of Some Derivatives of Furo[3,2-C]Pyridine and Their Starting CompoundsSome [3,2-c]pyridine derivatives were synthesized. 3-(Furan-2-yl)propenoic acid (1a) was prepared from furan-2-carbaldehyde under the Perkin's conditions. Obtained acid was converted to the corresponding azide3, which in turn was cyclized to give furo[3,2-c]pyridin-4(5H)-one (4a). The reaction of pyridone4awith phosphorus oxychloride rendered the chloroderivative7a, which was treated in the condition of Suzuki coupling reaction with boronic acid to give 4-phenylfuro[3,

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6

Aly, Ashraf A., Alaa A. Hassan, Nasr K. Mohamed, et al. "Synthesis of New Fused Heterocyclic 2-Quinolones and 3-Alkanonyl-4-Hydroxy-2-Quinolones." Molecules 24, no. 20 (2019): 3782. http://dx.doi.org/10.3390/molecules24203782.

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Herein, we report the synthesis of 5,12-dihydropyrazino[2,3-c:5,6-c′]difuro[2,3-c:4,5-c′]-diquinoline-6,14(5H,12H)diones, 2-(4-hydroxy-2-oxo-1,2-dihydroquinolin-3-yl)-1,4-diphenyl- butane-1,4-diones and 4-(benzo-[d]oxazol-2-yl)-3-hydroxy-1H-[4,5]oxazolo[3,2-a]pyridine-1-one. The new candidates were synthesized and identified by different spectroscopic techniques, and X-ray crystallography.

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7

Dodoff, Nicolay I., Richard A. Varga, and Dimitra Kovala-Demertzi. "Crystal Structure of N-3-Pyridinyl-methanesulfonamide and trans-Diiodobis(N-3-pyridinyl-methanesulfonamide)platinum(II)." Zeitschrift für Naturforschung B 59, no. 9 (2004): 1070–76. http://dx.doi.org/10.1515/znb-2004-0922.

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Crystals of N-3-pyridinyl-methanesulfonamide, PMSA (monoclinic, P21/c, a = 5.6436(7), b = 33.875(4), c = 8.3356(10) Å , β = 96.885(2)°) contain two non-equivalent molecules differing considerably in their conformations. The structure is stabilized by a network of hydrogen bonds, the strongest one being between the pyridine N atom and the sulfonamide H atom. Crystals of trans-[Pt(PMSA)2I2] (monoclinic, C2/c, a = 22.912(2), b = 5.2397(5), c = 17.3376(17) Å , β = 92.631(2)◦) contain centrosymmetric complex molecules in which PMSA is coordinated via the pyridine N atom, and Pt has a planar coordin

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8

Hökelek, Tuncer, Nurcan Akduran, Azer Özen, Güventürk Uğurlu та Hacali Necefoğlu. "Crystal structure of bis(μ-3-nitrobenzoato)-κ3O,O′:O;κ3O:O,O′-bis[bis(3-cyanopyridine-κN1)(3-nitrobenzoato-κ2O,O′)cadmium]". Acta Crystallographica Section E Crystallographic Communications 73, № 3 (2017): 413–16. http://dx.doi.org/10.1107/s2056989017002675.

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The asymmetric unit of the title compound, [Cd2(C7H4NO4)4(C6H4N2)4], contains one CdIIatom, two 3-nitrobenzoate (NB) anions and two 3-cyanopyridine (CPy) ligands. The two CPy ligands act as monodentate N(pyridine)-bonding ligands, while the two NB anions act as bidentate ligands through the carboxylate O atoms. The centrosymmetric dinuclear complex is generated by application of inversion symmetry, whereby the CdIIatoms are bridged by the carboxylate O atoms of two symmetry-related NB anions, thus completing the distorted N2O5pentagonal–bipyramidal coordination sphere of each CdIIatom. The ben

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9

Niu, Xiang-Long, Lin Wei, Jian-Cheng Liu, et al. "Syntheses and structures of three macrocyclic supramolecular complexes and one ZnII-containing coordination polymer generated from a semi-rigid multidentate N-containing ligand." Acta Crystallographica Section C Structural Chemistry 77, no. 1 (2021): 29–39. http://dx.doi.org/10.1107/s2053229620016083.

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Semirigid organic ligands can adopt different conformations to construct coordination polymers with more diverse structures when compared to those constructed from rigid ligands. A new asymmetric semirigid organic ligand, 4-{2-[(pyridin-3-yl)methyl]-2H-tetrazol-5-yl}pyridine (L), has been prepared and used to synthesize three bimetallic macrocyclic complexes and one coordination polymer, namely, bis(μ-4-{2-[(pyridin-3-yl)methyl]-2H-tetrazol-5-yl}pyridine)bis[dichloridozinc(II)] dichloromethane disolvate, [Zn2Cl4(C12H10N6)2]·2CH2Cl2, (I), the analogous chloroform monosolvate, [Zn2Cl4(C12H10N6)2

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10

Zhang, Shuguang, and Junpeng Zhuang. "r-1,t-3-Bis[4-(dimethylamino)phenyl]-c-2,t-4-bis(pyridin-4-yl)cyclobutane." Acta Crystallographica Section E Structure Reports Online 70, no. 3 (2014): o311. http://dx.doi.org/10.1107/s1600536814002311.

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The title compound, C30H32N4, was synthesized by the photodimerization oftrans-4-{2-[4-(dimethylamino)phenyl]ethenyl}pyridine in benzene upon irradiation with UV light. This photodimer has a puckered cyclobutane ring with the four aryl substituents in anr-1,t-2,c-3,tconformation. The puckering angle of the cyclobutane ring is 32.22 (7)°, which is the largest among reported tetraaryl-substituted cyclobutanes. In the crystal, the molecules form a hollow, one-dimensional structure extending parallel to thecaxisviatwo different pairs of C—H...π interactions.

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11

Bruns, Jörn, Christian Logemann, Alexander Weiz, Claudia Kolb, and Mathias S. Wickleder. "“Naked” S2O72– ions – the serendipitous formation of the disulfates [HPy]2[S2O7] and [bmim][HPy][S2O7] (HPy = pyridinium; bmim = 1-Butyl-3-methylimidazolium)." Zeitschrift für Naturforschung B 70, no. 1 (2015): 3–8. http://dx.doi.org/10.1515/znb-2014-0203.

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Abstract[bmim][HPy][S2O7] [monoclinic, P21/n, Z = 4, a = 825.78(2), b = 1545.30(3), c = 1410.80(3) pm, β = 104.726(1)°, V = 1741.16(7) Å3] was obtained as a side product in the reaction of GeCl4, oleum (65% SO3), and the pyridine (Py) complex Py·SO3 in the ionic liquid 1-butyl-3-methylimidazolium hydrogensulfate, [bmim][HSO4], at 50 °C. Charge compensation of the disulfate ion is achieved by the counterions pyridinium, [HPy]+, and 1-butyl-3-methylimidazolium, [bmim]+. The crystal structure shows alternating layers of [bmim]+ cations on one hand and [HPy]+ cations and disulfate anions on the ot

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12

Moon, Bokhee, Youngeun Jeon, Suk-Hee Moon та Ki-Min Park. "Crystal structure of a one-dimensional helical-type silver(I) coordination polymer:catena-poly[[silver(I)-μ-N-(pyridin-4-ylmethyl)pyridine-3-amine-κ2N:N′] nitrate dimethyl sulfoxide disolvate]". Acta Crystallographica Section E Structure Reports Online 70, № 12 (2014): 507–9. http://dx.doi.org/10.1107/s1600536814024817.

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The asymmetric unit of the title compound, {[Ag(C11H11N3)]NO3·2(CH3)2SO}n, comprises one AgIatom, oneN-(pyridine-4-ylmethyl)pyridine-3-amine ligand, one nitrate anion and two dimethyl sulfoxide molecules. The AgIatoms are bridged by two pyridine N atoms from two symmetry-related ligands, forming a helical chain and adopting a slightly distorted linear coordination geometry [N—Ag—N = 175.37 (8)°]. The helical chain, with a pitch length of 16.7871 (8) Å, propagates along theb-axis direction. In the crystal, symmetry-related right- and left-handed helical chains are alternately arrangedviaAg...Ag

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13

Riedel, Sophie, Maik Gerwig, Daniela Gerlach, et al. "The Hexacoordinate Si Complex SiCl4(4-Azidopyridine)2—Crystallographic Characterization of Two Conformers and Probing the Influence of SiCl4-Complexation on a Click Reaction with Phenylacetylene." Inorganics 11, no. 12 (2023): 473. http://dx.doi.org/10.3390/inorganics11120473.

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4-Azidopyridine (1) and SiCl4 react with the formation of the hexacoordinate silicon complex SiCl4(4-azidopyridine)2 (2). Upon dissolving in warm chloroform, the complex dissociates into the constituents 1 and SiCl4 and forms back upon cooling. Depending on the cooling, two different crystalline modifications of 2 were obtained, which feature two different trans-conformers. Slow cooling to room temperature afforded conformer 2′, which features coplanar pyridine rings. Rapid cooling to −39 °C afforded crystals of conformer 2″, in which the planes of the pyridine ligands are nearly orthogonal to

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14

Patel, Urmila H., and Ketankumar P. Purohit. "Pyridine and 3-methylpyridine solvates of the triple sulfa drug constitutent sulfamethazine." Acta Crystallographica Section C Structural Chemistry 73, no. 1 (2017): 9–12. http://dx.doi.org/10.1107/s2053229616015898.

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Sulfonamides display a wide variety of pharmacological activities. Sulfamethazine [abbreviated as SMZ; systematic name 4-amino-N-(4,6-dimethylpyrimidin-2-yl)benzenesulfonamide], one of the constitutents of the triple sulfa drugs, has wide clinical use. Pharmaceutical solvates are crystalline solids of active pharmaceutical ingredients (APIs) incorporating one or more solvent molecules in the crystal lattice, and these have received special attention, as the solvent molecule can impart characteristic physicochemical properties to APIs and solvates, therefore playing a significant role in drug d

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15

Kroņkalne, Rasma, Rūdolfs Beļaunieks, and Māris Turks. "Synthesis of 4-(tert-Butyldimethylsilyl)-4,5,6,7-tetrahydro-[1,2,3]triazolo[1,5-a]pyridine." Molbank 2022, no. 3 (2022): M1427. http://dx.doi.org/10.3390/m1427.

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SN2 rection between 4-(tert-butyldimethylsilyl)hex-5-yn-1-yl 4-methylbenzenesulfonate and NaN3 in DMF at 80 °C provided (6-azidohex-1-yn-3-yl)(tert-butyl)dimethylsilane intermediate, which underwent in situ intramolecular thermal Huisgen azide–alkyne cycloaddition reaction. This one-pot process gave 4-(tert-butyldimethylsilyl)-4,5,6,7-tetrahydro-[1,2,3]triazolo[1,5-a]pyridine in 78% yield.

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16

Wang, Hong Sheng, and Hai Feng Suo. "Synthesis and Structure of a Two-Dimensional Metal-Organic Framework: [Fe(C₇H₃NO₄)(H₂O)₂]_n." Advanced Materials Research 790 (September 2013): 33–36. http://dx.doi.org/10.4028/www.scientific.net/amr.790.33.

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A two-dimensional coordination polymer [Fe (C7H3NO4)(H2O)2]n was prepared with pyridine-2,3,5-tricarboxylic acid (H3pta) and iron (II) perchlorate at hydrothermal condition. Pyridine-2,3,5-tricarboxylic acid was decomposed to form the organic ligand of pyridine-3,5-dicarboxylate anion appeared in 1. Its crystal structure was determined by single crystal X-ray diffraction. The complex belongs to monoclinic crystal system, C2/c space group with a = 0.9945(2) nm, b = 1.2067(3) nm, c = 0.74125(15) nm, α = γ = 90°, β = 105.859(3)°, V = 0.8557(3) nm3, Z = 4, D =1.995 Mg/ m3. The Fe (II) ion is five-

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17

Aşkın, Gülçin Şefiye, Hacali Necefoğlu, Ali Murat Tonbul, Nefise Dilek та Tuncer Hökelek. "Crystal structure oftrans-diaquabis(nicotinamide-κN1)bis(4-nitrobenzoato-κO)manganese(II)". Acta Crystallographica Section E Crystallographic Communications 72, № 5 (2016): 656–58. http://dx.doi.org/10.1107/s2056989016005612.

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The asymmetric unit of the title compound, [Mn(C7H4NO4)2(C6H6N2O)2(H2O)2], contains one MnIIatom, one 4-nitrobenzoate (NB) anion, one nicotinamide (NA) ligand and one water molecule; NA and NB each act as a monodentate ligand. The MnIIatom, lying on an inversion centre, is coordinated by four O atoms and two pyridine N atoms in a distorted octahedral geometry. The water molecules are hydrogen bonded to the carboxylate O atoms. The dihedral angle between the carboxylate group and the adjacent benzene ring is 24.4 (3)°, while the benzene and pyridine rings are oriented at a dihedral angle of 86.

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18

Moon, Dohyun, Keon Sang Ryoo та Jong-Ha Choi. "Bis[trans-difluoridotetrakis(pyridine-κN)chromium(III)] sodium tetrachloridozincate perchlorate from synchrotron data". Acta Crystallographica Section E Structure Reports Online 70, № 7 (2014): m280. http://dx.doi.org/10.1107/s1600536814014408.

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The title salt, Na[CrF2(C5H5N)4]2[ZnCl4]ClO4, consists of two cationic CrIIIcomplexes, an Na+cation, one [ZnCl4]2−anion and one ClO4−anion. The CrIIIatoms are coordinated by four pyridine (py) N atoms and two F atoms in atransarrangement, displaying a distorted octahedral geometry. The mean Cr—N(py) and Cr—F bond lengths are 2.086 (8) and 1.864 (14) Å, respectively. The [ZnCl4]2−anion has a distorted tetrahedral geometry. The most notable feature of the crystal packing is the formation of weak pyridine–perchlorate C—H...O hydrogen bonds, resulting in supramolecular chains along theb-axis direc

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19

Moon, Suk-Hee, Hansu Im, Tae Ho Kim, and Ki-Min Park. "Crystal structure ofN,N′-bis(pyridin-3-ylmethyl)cyclohexane-1,4-diammonium dichloride." Acta Crystallographica Section E Crystallographic Communications 72, no. 12 (2016): 1728–30. http://dx.doi.org/10.1107/s2056989016017205.

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The title salt, C18H26N42+·2Cl−, was obtained by the protonation ofN,N-bis(pyridin-4-ylmethyl)cyclohexane-1,4-diamine with hydrochloric acid in ethanol. The asymmetric unit consists of one half of anN,N-bis(pyridin-3-ylmethyl)cyclohexane-1,4-diammonium dication, with a crystallographic inversion centre located at the centre of the cyclohexyl ring, and a chloride anion. The central cyclohexyl ring in the dication adopts a chair conformation. The twotrans-(4-pyridine)–CH2–NH2– moieties at the 1- and 4-positions of the central cyclohexyl ring occupy equatorial sites. The terminal pyridine ring is

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20

M., K. A. IBRAHIM, H. H. ELGHANDOUR A., S.M. ABDBL-SAYED G., and S.M. ABDEL FATTAH A. "Synthesis of Pyrazoles and Fused Pyrazoles. Novel Synthesis of Pyrano[2,3-c]pyrazole, Thieno[2,3-c]pyrazole and Pyrazolo[3,4-b ]pyridine Derivatives." Journal of Indian Chemical Society Vol. 74, Mar 1997 (1997): 206–8. https://doi.org/10.5281/zenodo.5885902.

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Department of Chemistry, Faculty of Science, Cairo University, Giza, A. R. Egypt <em>Manuscript received 17 November 1994, revised 26 July 1995, accepted 28 September 1995</em> 3-Metbyl-1-thiocarbamoylpyrazoi-5-one (1) reacted with <em>p</em>-metbylpbenscyl bromide to give 3-metbyl-1(4-tbiazol-2-yl)pyrazol-5-one (2). Compounds 1 and 2 were reacted with reagents such as α-cyanocinnamo. benzaldehyde, elemental suJphurlmalononltrlle, benzenediazomum chloride, pyrazol-5-yl-diazonium chloride malononitriie, and ethyl acetoacetate to afford pyrano[2,3-<em>c</em>]pyrazoles (4, 6) Pyra

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21

Hökelek, Tuncer, Elif Özbek, Mustafa Sertçelik, Çiğdem Şahin Yenice та Hacali Necefoğlu. "Crystal structure and Hirshfeld surface analysis of hexakis(μ-benzoato-κ2O:O′)bis(pyridine-3-carbonitrile-κN1)trizinc(II)". Acta Crystallographica Section E Crystallographic Communications 73, № 12 (2017): 1966–70. http://dx.doi.org/10.1107/s2056989017016899.

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The asymmetric unit of the title complex, [Zn3(C7H5O2)6(C6H4N2)2], contains one half of the complex molecule,i.e.one and a half ZnIIcations, three benzoate (Bnz) and one pyridine-3-carbonitrile (Cpy) molecule; the Bnz anions act as bidentate ligands through the carboxylate O atoms, while the Cpy ligand acts as a monodentate N(pyridine)-bonding ligand. The complete centrosymmetric trinuclear complex thus comprises a linear array of three ZnIIcations. The central ZnIIcation shows an octahedral coordination and is bridged to each of the terminal ZnIIcations by three Bnz anions. By additional coor

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22

Strey, Mark, and Peter G. Jones. "Pyridine 1:1 adducts of urea (Z′ = 1) and thiourea (Z′ = 8)." Acta Crystallographica Section C Structural Chemistry 74, no. 4 (2018): 406–10. http://dx.doi.org/10.1107/s2053229618002632.

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During our studies of urea and thiourea adducts, we noticed that no adducts with unsubstituted pyridine had been structurally investigated. The 1:1 adduct of pyridine and urea, C5H5N·CH4N2O, crystallizes in the P21/c space group with Z = 4. The structure is of a standard type for urea adducts, whereby the urea molecules form a ribbon, parallel to the a axis, consisting of linked R 2 2(8) rings, and the pyridine molecules are attached to the periphery of the ribbon by bifurcated (N—H...)2N hydrogen bonds. The 1:1 adduct of pyridine and thiourea, C5H5N·CH4N2S, crystallizes in the P21/n space gro

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23

Koshetova, Zh A., V. K. Yu, T. K. Iskakova, et al. "Novel 7-Aryliden-3,3a,4,5,6,7-(hexahydro-5-(2-ethoxyethyl)-2-phenyl-3-aryl-2H-pyrazolo[4,3-c]pyridine Hydrochloride: Synthesis and Structure." Eurasian Chemico-Technological Journal 24, no. 1 (2022): 43. http://dx.doi.org/10.18321/ectj1147.

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A Claisen-Schmidt type reaction of 1-(2-ethoxyethyl)piperidin-4-one with differ¬ent aromatic aldehydes led to corresponding dienones with a yield of 65‒71%. 7-Arylidene-3,3a,4,5,6,7-(hexahydro-5-(2-ethoxyethyl)-2-phenyl-3-aryl-2H-pyrazolo[4,3-c]pyridines were synthesized by heterocyclization of 3,5-dia¬rylidene-piperidin-4-ones with phenylhydrazine hydrochloride in methanol at 70 °C over 4‒6 h. The X-ray crystal structure determination of 7-(p-methoxy¬benzyliden)-3,3a,4,5,6,7-(hexahydro-5-(2-ethoxyethyl)-2-phenyl-3-(p-methoxy¬phenyl)-2H-pyrazolo[4,3-c]pyridine hydrochloride (the deposition num

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24

Palka, Barbara, Angela Di Capua, Maurizio Anzini, Gyté Vilkauskaité, Algirdas Šačkus, and Wolfgang Holzer. "Synthesis of trifluoromethyl-substituted pyrazolo[4,3-c]pyridines – sequential versus multicomponent reaction approach." Beilstein Journal of Organic Chemistry 10 (July 31, 2014): 1759–64. http://dx.doi.org/10.3762/bjoc.10.183.

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A straightforward synthesis of 6-substituted 1-phenyl-3-trifluoromethyl-1H-pyrazolo[4,3-c]pyridines and the corresponding 5-oxides is presented. Hence, microwave-assisted treatment of 5-chloro-1-phenyl-3-trifluoromethylpyrazole-4-carbaldehyde with various terminal alkynes in the presence of tert-butylamine under Sonogashira-type cross-coupling conditions affords the former title compounds in a one-pot multicomponent procedure. Oximes derived from (intermediate) 5-alkynyl-1-phenyl-3-trifluoromethyl-1H-pyrazole-4-carbaldehydes were transformed into the corresponding 1H-pyrazolo[4,3-c]pyridine 5-

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25

Gryko, Dorota. "(Invited) Application of N-Amino Pyridinium Salts in Photochemical Transformations." ECS Meeting Abstracts MA2025-01, no. 56 (2025): 2717. https://doi.org/10.1149/ma2025-01562717mtgabs.

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Amines play crucial roles as biologically active compounds in medicine, as synthetic intermediates in organic chemistry.1 Along this line, N-amino pyridinium salts have recently received a lot of attention as precursors to generate N-centered radicals via photochemical means.1 These are attractive for generating new C-N bonds, giving access to γ-aminocarbonyl moieties2 or meta-functionalized pyridine.3 Upon light irradiation, electron transfer from the excited state of the Ir(III)*-catalyst to the N-amino pyridinium salt results in the N-N bond cleavage generating an amidyl radical. Subsequent

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26

Červená, Irena, Jiří Holubek, Emil Svátek, Jan Metyš, Martin Valchář, and Miroslav Protiva. "Potential antidepressants: Synthesis of two 4-(aminoalkoxy)dibenzo[b,e]thiepin-11(6H)-ones." Collection of Czechoslovak Chemical Communications 54, no. 1 (1989): 225–28. http://dx.doi.org/10.1135/cccc19890225.

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Heating of 4-methoxydibenzo[b,e]thiepin-11(6H)-one with pyridine hydrochloride to 225 to 235 °C effected demethylation and gave IV. Its sodium salt reacted with 3-dimethylaminopropyl chloride in ethanol and afforded the 4-(3-dimethylaminopropoxy) compound II. The isomeric ether III was prepared via the 4-(4-bromobutoxy) compound V. Hydrochloride of II (VÚFB-17 033) inhibited mildly the binding of [3H]desipramine in rat hypothalamus, had antireserpine activity in rats, mild anticonvulsant effect, and antihypoxic effect in the test of nitrogen anoxia in mice.

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27

Donath, Ch, M. Meisel, K. H. Jost, K. K. Palkina, S. I. Maksimova та N. T. Čibiskova. "Preparation and Crystal Structure of New 1,3-Diaza-λ5,λ5-diphosphetidines". Zeitschrift für Naturforschung B 41, № 10 (1986): 1201–5. http://dx.doi.org/10.1515/znb-1986-1003.

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Abstract Reaction of py · PS2Cl (py = pyridine) with benzyl amine in the presence of NEt3 yields triethyl-ammonium 1,3-dibenzyl-2,4-dithioxo-1,3-diaza-2λ5,4λ5-diphosphetidine-2,4-dithiolate which reacts with MeI to give the corresponding methyl ester. By fractional crystallization from cyclohexane three modifications of the methyl ester were obtained (two trans-(A and A') and one cis-modification (B)). The crystal structure of these modifications have been determined by single crystal X-ray diffraction. Crystal data: A: triclinic, space group P1̄ , Z = 2, a = 7.100(3), b = 10.088(6), c = 17.78

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28

Meyer, Andreas, Gregor Schnakenburg, and Olav Schiemann. "Crystal structure of 4′-{[4-(2,2′:6′,2′′-terpyridyl-4′-yl)phenyl]ethynyl}biphenyl-4-yl (2,2,5,5-tetramethyl-1-oxyl-3-pyrrolin-3-yl)formate benzene 2.5-solvate." Acta Crystallographica Section E Crystallographic Communications 71, no. 10 (2015): 1245–49. http://dx.doi.org/10.1107/s2056989015017697.

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The title compound, C44H35N4O3·2.5C6H6(1), consists of a terpyridine and aN-oxylpyrroline-3-formate group separated by an aromatic spacer,viz.4-(phenylethynyl)-1,1′-biphenyl. It crystallized in the triclinic space groupP-1 with two and a half benzene solvate molecules (one benzene molecule is located about an inversion center), while the dichloromethane solvate (2) of the same molecule [Ackermannet al.(2015).Chem. Commun.51, 5257–5260] crystallized in the tetragonal space groupP42/n, with considerable disorder in the molecule. In (1), the terpyridine (terpy) group assumes an all-transconformat

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29

Antony, Priya, S. Antony Inglebert, Jerald V. Ramaclus, S. John Sundaram, and P. Sagayaraj. "Crystal structures of two stilbazole derivatives: bis{(E)-4-[4-(diethylamino)styryl]-1-methylpyridin-1-ium} tetraiodidocadmium(II) and (E)-4-[4-(diethylamino)styryl]-1-methylpyridin-1-ium 4-methoxybenzenesulfonate monohydrate." Acta Crystallographica Section E Crystallographic Communications 74, no. 12 (2018): 1891–94. http://dx.doi.org/10.1107/s2056989018016808.

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The title molecular salts, (C18H23N2)2[CdI4], (I), and C18H23N2 +·C7H7O4S−·H2O, (II), are stilbazole, or 4-styrylpyridine, derivatives. The cation, (E)-4-[4-(diethylamino)styryl]-1-methylpyridin-1-ium, has a methyl group attached to pyridine ring and a diethyl amine group attached to the benzene ring. The asymmetric unit of salt (I), comprises one cationic molecule and half a CdI4 dianion. The Cd atom is situated on a twofold rotation axis and has a slightly distorted tetrahedral coordination sphere. In (II), the anion consists of a 4-methoxybenzenesulfonate and it crystallizes as a monohydrat

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30

Cati, Dilovan S., and Helen Stoeckli-Evans. "Crystal structures ofN2,N3,N5,N6-tetrakis(pyridin-2-ylmethyl)pyrazine-2,3,5,6-tetracarboxamide andN2,N3,N5,N6-tetrakis(pyridin-4-ylmethyl)pyrazine-2,3,5,6-tetracarboxamide." Acta Crystallographica Section E Crystallographic Communications 73, no. 2 (2017): 300–305. http://dx.doi.org/10.1107/s205698901700127x.

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The title compounds, C32H28N10O4· unknown solvent, (I), and C32H28N10O4, (II), are pyrazine-2,3,5,6-tetracarboxamide derivatives. In (I), the substituents are (pyridin-2-ylmethyl)carboxamide, while in (II), the substituents are (pyridin-4-ylmethyl)carboxamide. Both compounds crystallize in the monoclinic space groupP21/n, withZ′ = 1 for (I), andZ′ = 0.5 for (II). The whole molecule of (II) is generated by inversion symmetry, the pyrazine ring being situated about a center of inversion. In (I), the four pyridine rings are inclined to the pyrazine ring by 83.9 (2), 82.16 (18), 82.73 (19) and 17.

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31

Park, Ki-Min, Jieun Lee та Youngjin Kang. "Crystal structure of [2,6-difluoro-3-(pyridin-2-yl-κN)pyridin-4-yl-κC4](pentane-2,4-dionato-κ2O,O′)platinum(II)". Acta Crystallographica Section E Crystallographic Communications 71, № 4 (2015): 354–56. http://dx.doi.org/10.1107/s2056989015004375.

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The asymmetric unit of the title compound, [Pt(C10H5F2N2)(C5H7O2)], comprises one PtIIatom, one 2,6-difluoro-2,3-bipyridine ligand and one acetylacetonate anion. The PtIIatom adopts a distorted square-planar coordination geometry, beingC,N-chelated by the 2,6-difluoro-3-(pyridin-2-yl)pyridin-4-yl ligand andO,O′-chelated by the pentane-2,4-dionate ligand. The two pyridine rings of the bipyridine ligand are approximately coplanar, making a dihedral angle of 1.2 (2)°. A variety of intra- and intermolecular C—H...O and C—H...F hydrogen bonds, as well as π–π interactions [centroid–centroid distance

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32

Seredyuk, Maksym, Natalia O. Sharkina, Elzbieta Gumienna-Kontecka, and Anatoly A. Kapshuk. "Bis[3-methyl-5-(pyridin-2-yl)-1H-pyrazol-4-yl] selenide methanol hemisolvate." Acta Crystallographica Section E Structure Reports Online 70, no. 2 (2014): o127—o128. http://dx.doi.org/10.1107/s1600536813034624.

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The asymmetric unit of the title compound, C18H16N6Se·0.5CH3OH, contains two independent molecules of bis[3-methyl-5-(pyridin-2-yl)-1H-pyrazol-4-yl] selenide with similar C—Se—C bond angles [99.30 (14) and 98.26 (13)°], and a methanol molecule of solvation. In one molecule, the dihedral angles between pyrazole and neighbouring pyridine rings are 18.3 (2) and 15.8 (2)°, and the corresponding angles in the other molecule are 13.5 (2) and 8.3 (2)°. In the crystal, the selenide and solvent molecules are linked by classical O—H...N and N—H...N hydrogen bonds, as well as by weak C—H...O and C—H...π

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33

Scaffidi, Adrian, Brian W. Skelton, Robert V. Stick та Allan H. White. "The Synthesis of Some Oligopeptides Derived from Novel Carbohydrate α-Amino Acids". Australian Journal of Chemistry 57, № 8 (2004): 733. http://dx.doi.org/10.1071/ch04014.

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The attempted coupling of a carbohydrate α-azido acid with a carbohydrate α-amino ester in the presence of a diimide, hopefully to produce a dipeptide, yielded only the carboxylic anhydride. However, the combination of 4-toluenesulfonyl chloride in pyridine was successful, and four carbohydrate dipeptides were separately produced. One of these dipeptides was further transformed into a tripeptide, and another into a hexapeptide. A single-crystal X-ray structure is reported for (3S)-3-azido-3-C-carboxy-3-deoxy-1,2:5,6-di-O-isopropylidene-α-d-ribo-hexose, amide with (3S)-3-amino-3-deoxy-1,2:5,6-d

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34

Onggo, D., DC Craig, AD Rae, and HA Goodwin. "Coordination of 6-Methyl-2,2'-bipyridine. Structure of Bivalent Copper and Palladium Complexes." Australian Journal of Chemistry 44, no. 2 (1991): 219. http://dx.doi.org/10.1071/ch9910219.

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Bis ( ligand ) complexes of 6-methyl-2,2′-bipyridine (L) with copper(II) and palladium(II) have been prepared, and their structures have been determined by single-crystal X-ray diffractometry . In the formation of the complex fromcopper(II) tetrafluoroborate and L, partial hydrolysis of a coordinated fluoroborate ion to the hydroxytrifluoroborate ion occurs. The stereochemistry about copper in [CuL2OHBF3][BF4] is essentially trigonal bipyramidal with an axial compression. The nitrogens of the methyl-substituted pyridine rings coordinate in the axial sites. In [PdL2Cl][BF4] the coordination env

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35

Moon, Suk-Hee, Donghyun Kang та Ki-Min Park. "Crystal structure of an HgIIcoordination polymer with an unsymmetrical dipyridyl ligand:catena-poly[[[dichloridomercury(II)]-μ-N-(pyridin-4-ylmethyl)pyridin-3-amine-κ2N:N′] chloroform hemisolvate]". Acta Crystallographica Section E Crystallographic Communications 72, № 11 (2016): 1513–16. http://dx.doi.org/10.1107/s2056989016015310.

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The asymmetric unit of the title compound, {[HgLCl2]·0.5CHCl3}n(L=N-(pyridin-4-ylmethyl)pyridin-3-amine, C11H11N3), contains one HgIIion, one bridgingLligand, two chloride ligands and a chloroform solvent molecule with half-occupancy that is disordered about a crystallographic twofold rotation axis. Each HgIIion is coordinated by two pyridine N atoms from two symmetry-relatedLligands and two chloride anions in a highly distorted tetrahedral geometry with bond angles falling in the range 99.05 (17)–142.96 (7)°. EachLligand bridges two HgIIions, forming polymeric zigzag chains propagating in [01

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36

Hartmann, Edmund, Raimund Schmid, and Joachim Strähle. "Synthese von zweikernigen Triazenido- und Pentaazadienidokomplexen des einwertigen Silbers. Kristallstruktur von [Ag(MeOC6H4N3C6H4OM e)]2· 2/3 Py, [Ag(MeOC6H4N5C6H4OMe)]2 und [Ag(EtOC6H4N5C6H4OEt)]2 · Py / Dimeric Triazenido and Pentaazadienido Complexes of Monovalent Silver. Synthesis and Structure of [Ag(MeOC6H4N3C6H4OM e)]2· 2/3 Pyridine, [Ag(MeOC6H4N5C6H4OMe)]2 und [Ag(EtOC6H4N5C6H4OEt)]2 · Pyridine." Zeitschrift für Naturforschung B 44, no. 7 (1989): 778–85. http://dx.doi.org/10.1515/znb-1989-0710.

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[Ag(MeOC6H4N3C6H4OMe)]2 (1) is formed in THF from AgNO3 , and the triazenide anion, as obtained from the corresponding triazene and Na. 1 crystallizes from pyridine in the form of orange-yellow , air stable crystals with the com position 1·2/3 C5H5N: space group P 1̅ with a = 1468.0(5), b = 1514.1(6), c - 1316.1(3) pm, a = 113.45(3)°, β = 1 1 4 .8 1 (2 )°, γ = 66.78(3)°, Z - 3. The triazenide ion functions as a bridging ligand forming planar (AgN3)2 heterocycles. The unit cell contains two symmetry-independent dinuclear complexes, one of which is centrosymmetrical. The short Ag -Ag distances o

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37

Cati, Dilovan S., and Helen Stoeckli-Evans. "Crystal structure of a pyrazine-2,3-dicarboxamide ligand and of its silver(I) nitrate complex, a three-dimensional coordination polymer." Acta Crystallographica Section E Crystallographic Communications 73, no. 6 (2017): 798–803. http://dx.doi.org/10.1107/s2056989017006387.

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The title ligand, C18H16N6O2·2H2O (L1) [N2,N3-bis(pyridin-4-ylmethyl)pyrazine-2,3-dicarboxamide], crystallized as a dihydrate. The molecule is U-shaped with the carboxamide groups beingcisto one another, making a dihedral angle of 81.6 (5)°. The terminal pyridine rings are inclined to one another by 58.5 (4)°. There is an intramolecular N—H...Npyrazinehydrogen bond present, forming anS(5) ring motif. In the crystal, adjacent molecules are linked by N—H...Ocarboxamidehydrogen bonds, forming a chain along [001]. A chain of hydrogen-bonded water molecules is linked to the chain of (L1) molecules

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38

Ha, Kwang. "(Acridine-κN)(pyridine-2,6-dicarboxylato-κ3O2,N,O6)palladium(II)". Acta Crystallographica Section E Structure Reports Online 68, № 4 (2012): m454. http://dx.doi.org/10.1107/s1600536812011385.

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In the title complex, [Pd(C7H3NO4)(C13H9N)], the PdIIion is four-coordinated in a distorted square-planar environment by one N and two O atoms from the tridentate pyridine-2,6-dicarboxylate (dipic) anionic ligand and one N atom of the acridine (acr) ligand. The dipic and acr ligands are nearly planar [maximum deviation = 0.069 (3) Å in dipic and 0.091 (4) Å in acr] and the dihedral angle between their mean planes is 58.67 (7)°. The Pd—O bond lengths are nearly equal, but the Pd—N bond lengths are slightly different. There is a short C—H...O interaction in the molecule involving the two ligands

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39

Fu, Zhiyong, and Tristram Chivers. "Solvent effects on the reactions of copper chlorides with OP(NH-t-Bu)3 — Formation of the novel [Cu5Cl10]5– anion via in situ templation." Canadian Journal of Chemistry 85, no. 5 (2007): 358–65. http://dx.doi.org/10.1139/v07-038.

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X-ray structural investigations have shown that the products of the reaction of CuCl2·2H2O and OP[NH-t-Bu]3 are markedly dependent on solvent and temperature. The polymeric ionic complex [(t-BuNH3)2(Cu3(OH)(H2O)Cl7)]∞ (1), containing a trinuclear anionic repeating unit, is obtained from toluene at 80 °C, whereas the 2:1 adduct Cu(t-BuNH2)2Cl2 (4) is formed at 150 °C. By contrast, a neutral tetranuclear cluster Cu4[PO(NH-t-Bu)3]4(µ4-O)Cl6 (2) or the one-dimensional chain [Cu(Py)2Cl2]∞ (3) is produced when the reaction is carried out in hexane or pyridine, respectively, at 80 °C. The reaction of

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40

Shakurova, Elvira Rifovna, Darina Alexandrovna Pozdnyakova, Elena Valeryevna Tretyakova, and Lyudmila Vyacheslavovna Parfenova. "One-pot Synthesis of Betulin Triterpenoid Quaternized Pyridine Derivatives and their Antimicrobial Activity." Letters in Drug Design & Discovery 17, no. 1 (2019): 79–84. http://dx.doi.org/10.2174/1570180816666181217123629.

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Background: A wide range of biological activity, relatively low toxicity and multiple pharmacological effects of triterpenoids are major advantages of these compounds in the prevention and treatment of various diseases. They include the lupane- type triterpenoids that proved to be a promising platform for the synthesis of analogs with a wide range of biological activities, including anti-inflammatory, antitumor, antiparasitic and antiviral properties. The main disadvantage complicating the use of all known derivatives of lupane acids in medical practice is low bioavailability associated with p

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41

da Silva Lima, Camilo Henrique, Júlio César de Araujo Vanelis Soares, Joana Lucius de Sousa Ribeiro, Estela Maris Freitas Muri, Sérgio de Albuquerque, and Luiza Rosaria Sousa Dias. "Anti-Trypanosoma cruzi Activity and Molecular Docking Studies of 1Hpyrazolo[ 3, 4-b]pyridine Derivatives." Letters in Drug Design & Discovery 17, no. 2 (2020): 184–91. http://dx.doi.org/10.2174/1570180816666190305141733.

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Background: Untargeted studies led to the development of some pyrazolopyridine derivatives for the antiparasitic profile, particularly the derivatives containing the structural carbohydrazide subunit. In this work, we proceeded in the biological screening of 27 N’- (substitutedphenylmethylene)- 4-carbohydrazide-3-methyl-1-phenyl-1H-pyrazolo[3, 4-b]pyridine derivatives against T. cruzi as well as the cytotoxic evaluation. To obtain more information about the trypanocidal activity of this class of compounds, we carried out molecular docking simulations to get an insight into putative targets in

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42

Waters, AF, and AH White. "Synthesis and Structural Systematics of Nitrogen Base Adducts of Group 2 Salts. II. Some Adducts of Group 2 Salts With Pyridine." Australian Journal of Chemistry 49, no. 1 (1996): 35. http://dx.doi.org/10.1071/ch9960035.

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Recrystallization of Group 2 halides from pyridine ( py ) solution has yielded, in a number of cases, crystalline adducts MX2.npy which have been the subject of room-temperature single-crystal X-ray structural characterization. MgBr2.6py (1) is orthorhombic, Ccca, a 11.575(2), b 14.999(4), c 17.292(2) Ǻ, Z = 4; conventional R on [F] for No = 752 'observed' (I > 3σ(I)) reflections was 0.043. The compound is formulated as [( py )4MgBr2].2py, the metal atom on a site of 222 symmetry having a trans-X2MN4 coordination environment. With CaCl2, a 1:2 adduct (2) is formed, orthorhombic, Fdd2, a 33.

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43

Neumann, Tristan, Inke Jess та Christian Näther. "Crystal structures of bis[4-(dimethylamino)pyridinium] tetrakis(thiocyanato-κN)manganate(II) and tris[4-(dimethylamino)pyridinium] pentakis(thiocyanato-κN)manganate(II)". Acta Crystallographica Section E Crystallographic Communications 74, № 1 (2018): 15–20. http://dx.doi.org/10.1107/s2056989017017510.

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The crystal structures of the title salts, (C7H11N2)2[Mn(NCS)4] (1) and (C7H11N2)3[Mn(NCS)5] (2), consist of manganese(II) cations that are tetrahedrally (1) or trigonal–bipyramidally (2) coordinated to four or five terminal N-bonded thiocyanate ligands, respectively, into discrete anionic complexes. The negative charge is compensated by two (1) or three (2) 4-(dimethylamino)pyridinium cations, which are protonated at the pyridine N atom. The asymmetric unit of compound1consists of one anionic complex and two 4-(dimethylamino)pyridinium cations, whereas that of compound2consists of two anionic

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44

Werner, Helmut, and Uwe Brekau. "Synthese und Reaktivität von Vinyliden-Rhodiumkomplexen mit C=CHtBu und C=CHCO2Me als Liganden [1] / Synthesis and Reactivity of Vinylidene Rhodium Complexes Containing C=CHtBu and C=CHCO2Me as Ligands [1]." Zeitschrift für Naturforschung B 44, no. 11 (1989): 1438–46. http://dx.doi.org/10.1515/znb-1989-1119.

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Square-planar alkyne rhodium complexes trans-[RhCl(RC=CCO2Me)(PiPr3)2] (4-6) bearing at least one electron withdrawing substituent at the C=C triple bond are prepared from [RhCl(PiPr3)2] (3) and RC=CCO2Me. Reaction of 3 with tBuC≡CH gives the isomeric alkyne (7) and alkynyl hydrido (8) rhodium complexes in a stepwise fashion. 8 can be trapped with pyridine to produce [RhH(C2tBu)Cl(PiPr3)2(NC5H5)] (10). Thermal rearrangement of 6 (R = H) and 8 leads to the formation of the vinylidene complexes trans-[RhCl(=C=CHR)(PiPr3)2] (9,12) which react with NaC5H5 in THF to give the cyclopentadienyl deriva

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45

Kavitha, Channappa N., Hemmige S. Yathirajan, Manpreet Kaur, Eric C. Hosten, Richard Betz, and Christopher Glidewell. "Three-dimensional hydrogen-bonded framework structures in flunarizinium nicotinate and flunarizinediium bis(4-toluenesulfonate) dihydrate." Acta Crystallographica Section C Structural Chemistry 70, no. 8 (2014): 805–11. http://dx.doi.org/10.1107/s2053229614016532.

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The structures of two salts of flunarizine, namely 1-bis[(4-fluorophenyl)methyl]-4-[(2E)-3-phenylprop-2-en-1-yl]piperazine, C26H26F2N2, are reported. In flunarizinium nicotinate {systematic name: 4-bis[(4-fluorophenyl)methyl]-1-[(2E)-3-phenylprop-2-en-1-yl]piperazin-1-ium pyridine-3-carboxylate}, C26H27F2N2+·C6H4NO2−, (I), the two ionic components are linked by a short charge-assisted N—H...O hydrogen bond. The ion pairs are linked into a three-dimensional framework structure by three independent C—H...O hydrogen bonds, augmented by C—H...π(arene) hydrogen bonds and an aromatic π–π stacking in

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46

Ullah, Nisar, and Helen Stoeckli-Evans. "Crystal structure and Hirshfeld surface analysis of the hydrochloride salt of 8-{4-[(6-phenylpyridin-3-yl)methyl]piperazin-1-yl}-3,4-dihydroquinolin-2(1H)-one." Acta Crystallographica Section E Crystallographic Communications 77, no. 2 (2021): 208–12. http://dx.doi.org/10.1107/s2056989021000979.

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The amine 8-{4-[(6-phenylpyridin-3-yl)methyl]piperazin-1-yl}-3,4-dihydroquinolin-2(1H)-one was crystallized as the hydrochloride salt, 4-(2-oxo-1,2,3,4-tetrahydroquinolin-8-yl)-1-[(6-phenylpyridin-3-yl)methyl]piperazin-1-ium chloride, C25H27N4 +·Cl− (I·HCl). The conformation of the organic cation is half-moon in shape enclosing the chloride anion. The piperidine ring of the 3,4-dihydroquinolin-2(1H)-one moiety has a screw-boat conformation, while the piperazine ring has a chair conformation. In the biaryl group, the pyridine ring is inclined to the phenyl ring by 40.17 (7) and by 36.86 (8)° to

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47

Hamann, Thomas, Dagmar Henschel, Ilona Lange, Oliver Moers, Armand Blaschette, and Peter G. Jones. "Polysulfonylamine, CLVII [1]. Molekulare Cokristalle aus Di(4-halogenbenzolsulfonyl)aminen und Sauerstoffbasen: Lamellare Schichten mit engen Zwischenschichtkontakten der Art C-H···Hal, Cl ··· Cl oder Br ··· Br / Molecular Co-crystals of Di(4-halobenzenesulfonyl)amines and Oxygen Bases: Lamellar Layers with Close C-H···Hal, Cl · · · Cl or Br · · · Br." Zeitschrift für Naturforschung B 57, no. 9 (2002): 1051–65. http://dx.doi.org/10.1515/znb-2002-0912.

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Di(4-fluorobenzenesulfonyl)amine (DFBSA), di(4-chlorobenzenesulfonyl)amine (DCBSA) or di(4-bromobenzenesulfonyl)amine (DBBSA) were co-crystallized with equimolar amounts of pyridine-N-oxide (PyO), dimethyl formamide (DMF) or 1,3-dimethylurea (DMU), respectively, to form the supramolecular complexes DFBSA·PyO (1; triclinic, space group P1 , Z = 1), DCBSA·DMF (2; monoclinic, P21/n, Z = 1) and DBBSA·DMU (3; triclinic, P1 , Z = 1). Throughout the triad, the molecules are ordered into lamellar layers parallel to the xy plane. Owing to the folded conformations of the disulfonylamines, the layers dis

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48

Nayak, Prakash S., Badiadka Narayana, Hemmige S. Yathirajan, Eric C. Hosten, Richard Betz, and Christopher Glidewell. "(2E)-3-(6-Methoxynaphthalen-2-yl)-1-(pyridin-3-yl)prop-2-en-1-one and its cyclocondensation product with guanidine, (4RS)-2-amino-4-(6-methoxynaphthalen-2-yl)-6-(pyridin-3-yl)-3,4-dihydropyrimidine monohydrate: two types of hydrogen-bonded sheet." Acta Crystallographica Section C Structural Chemistry 70, no. 11 (2014): 1011–16. http://dx.doi.org/10.1107/s2053229614021524.

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The structures of a chalcone and of its cyclocondensation product with guanidine are reported. In (2E)-3-(6-methoxynaphthalen-2-yl)-1-(pyridin-3-yl)prop-2-en-1-one, C19H15NO2, (I), the planes of the pyridine and naphthalene units make dihedral angles with that of the central spacer unit of 23.61 (13) and 23.57 (15)°, respectively, and a dihedral angle of 47.24 (9)° with each other. The molecules of (I) are linked into sheets by a combination of C—H...O and C—H...π(arene) hydrogen bonds. In the cyclocondensation product (4RS)-2-amino-4-(6-methoxynaphthalen-2-yl)-6-(pyridin-3-yl)-3,4-dihydropyri

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49

Moon, Suk-Hee, Youngjin Kang та Ki-Min Park. "Crystal structure of a helical silver(I) coordination polymer based on an unsymmetrical dipyridyl ligand:catena-poly[[silver(I)-μ-N-(pyridin-4-ylmethyl)pyridine-3-amine-κ2N:N′] tetrafluoridoborate methanol hemisolvate]". Acta Crystallographica Section E Crystallographic Communications 71, № 11 (2015): 1287–89. http://dx.doi.org/10.1107/s205698901501837x.

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The asymmetric unit of the title compound, {[AgL]·BF4·0.5CH3OH}n,L=N-(pyridin-4-ylmethyl)pyridine-3-amine, C11H11N3, contains one AgIion, one ligandL, one tetrafluoridoborate anion disordered over two orientations in a 0.669 (13):0.331 (13) ratio and one half of a methanol solvent molecule situated on an inversion center. Each AgIion is coordinated by two N atoms from twoLligands in a distorted linear geometry [N—Ag—N = 174.70 (19)°]. EachLligand bridges two AgIions, thus forming polymeric helical chains propagating in [010]. In the crystal, Ag...Ag [3.3369 (10) Å] and π–π interactions between

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Myśliborski, Radomir, Krystyna Rachlewicz, and Lechosław Latos-Grażyński. "Low-spin organoiron(III) N-confused pyriporphyrin." Journal of Porphyrins and Phthalocyanines 11, no. 03 (2007): 172–80. http://dx.doi.org/10.1142/s1088424607000229.

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Abstract:

Oxidation of ( PyP H) Fe II Br , an iron(II) complex of 6,11,16,21-tetraaryl-3-aza-m-benziporphyrin ( N -confused pyriporphyrin, ( PyP H) H ) has been followed, in the presence of pyridine, by 1 H and 2 H NMR spectroscopy. One-electron oxidation with dioxygen, accompanied by deprotonation of a C (22) H fragment and formation of a Fe - C (22) bond, produced a low-spin, six-coordinate iron(III) complex [( PyP ) Fe III( py )2]+ as confirmed by combination of 1 H NMR, EPR and structural data. The characteristic patterns of 1 H NMR pyrrole and meso-aryl resonances resemble features assigned to the

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