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Journal articles on the topic 'Pyridine adduct'

Author: Grafiati

Published: 5 June 2025

Last updated: 1 August 2025

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1

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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2

Suresh, T., S. Santosh Kumar, N. M. Kottureshawara, M. Revanasidappa, Syed Khasim, and Suresh. "Spectrophotometric Study of Nitrogen Base Adducts of Nickel(II)-4-methyl-8–quinolinate." E-Journal of Chemistry 5, no. 2 (2008): 404–8. http://dx.doi.org/10.1155/2008/989205.

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Adduct formation constants have been determined by spectrophotometric study of a few typical bases with nickel(II) chelate of 4-methyl-8-quinolinol in chloroform. Bathochromic and hypsochromic shifts were observed in the visible range due to the adduct formation. Monobasic bases like pyridine, methyl substituted anilines and such other bases exhibit 1: 2 stoichiometry giving hexa – coordinated adductds . The dibasic bases such as 1,10-phenanthroline and 2,9- neocuproine exhibit 1 : 1 stoichiometry giving hexacoordinated adducts . The experimental results are discussed in terms of the basicity

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3

Riedel, Sophie, Erica Brendler, Robert Gericke, Edwin Kroke, and Jörg Wagler. "Cyanopyridine adducts of SiF₄ and SiCl₄." Zeitschrift für Naturforschung B 79, no. 12 (2024): 675–85. https://doi.org/10.1515/znb-2024-0085.

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Abstract The formation of cyanopyridine (CN-py) adducts of silicon tetrahalides was investigated for 3- and 4-cyanopyridine in combination with SiF4 and SiCl4. Whereas bubbling of SiF4 through toluene solutions of 3-CN-py and 4-CN-py afforded white precipitates, which should possess the respective composition SiF4(CN-py)2, addition of SiCl4 did not cause any precipitation. Upon storage of the toluene solution of SiCl4 and 4-CN-py at 6 °C for several weeks, some crystals of the composition SiCl4(4-CN-py)2 ⋅ 2 (4-CN-py) ⋅ (toluene) were obtained. The use of SiCl4 as the solvent (i.e. SiCl4 in la

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4

Tuna, Ali, Anastassios Papageorgiou, Anssi Peuronen, Pekka Peljo, and Günther Knör. "mer-[InCl3(C5D5N)3]2·C5D5N: A New d5-pyridine Derivative of Indium(III) Chloride Complex." Journal of the Turkish Chemical Society Section A: Chemistry 12, no. 1 (2025): 15–22. https://doi.org/10.18596/jotcsa.1590991.

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In this study, we report the crystal structure of a meridional octahedral pyridine-indium(III) chloride adduct, mer-trichlorotris(d5-pyridine)indium(III)·0.5(d5-pyridine), InCl3(C5D5N)3·0.5(C5D5N), which exhibits an unreported molecule-to-solvent ratio compared to other substituted and unsubstituted pyridine-indium(III) chloride adducts described in earlier literature. The bonding characteristics of this d5-pyridine complex are compared to analogous complexes that have already been reported. Furthermore, the role of this metal complex in indium insertion into corrole ligands is discussed.

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5

Drebushchak, Tatiana N., Mikhail A. Mikhailenko, Elena V. Boldyreva, and Tatyana P. Shakhtshneider. "Tetragonal polymorph of the 1:1 adduct of sulfathiazole with pyridine." Acta Crystallographica Section E Structure Reports Online 62, no. 7 (2006): o2669—o2671. http://dx.doi.org/10.1107/s1600536806020101.

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The title tetragonal polymorph is one of the two sulfathiazole–pyridine adducts, C9H9N3O2S2·C5H5N, that can be formed either by crystallization from an n-propanol–pyridine solution, or by exposure of solid sulfathiazole to pyridine vapour. The asymmetric unit consists of a hydrogen-bonded sulfathiazole–pyridine pair. Hydrogen bonds of the form Naniline—H...Osulfonyl form a three-dimensional network. Pyridine molecules linked to sulfathiazole molecules by Namino—H...Npyridine hydrogen bonds are located in the channels of the sulfathiazole framework which extend along the 41 axis. The angle betw

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6

El-Abadelah, Mustafa M., Firas F. Awwadi, Ahmad H. Abdullah, and Wolfgang Voelter. "The reaction of imidazo[1,5-a]pyridines with ninhydrin revisited." Zeitschrift für Naturforschung B 75, no. 6-7 (2020): 559–65. http://dx.doi.org/10.1515/znb-2020-0027.

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AbstractThe synthesis of 2,2′-(Imidazo[1,5-a]pyridine-1,3-diyl)bis(2-hydroxy-1H-indene-1,3(2H)-dione) (11) is achieved by reaction of imidazo[1,5-a]pyridine (7) with two equivalents of ninhydrin (1) at room temperature. The structure of this new 1,3-bis-adduct 11 is evidenced from HRMS and NMR spectral data and confirmed by single-crystal X-ray crystallography. Employment of equimolar amounts of 1 and 7 gave a separable mixture of the respective 1- and 3-monomeric adducts (9, 10).

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7

K., C. MALHOTRA, BALA NEERAJ SHARMA BRIJ, S. BHATI S., and CHAUDHRY S.C. "Adducts of 4-t-Butylphenoxo Complexes of Oxovanadium(v) with 2-, 3- and 4-Cyanopyridines." Journal of Indian Chemical Society Vol. 75, Mar 1998 (1998): 137–39. https://doi.org/10.5281/zenodo.5915570.

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Department of Chemistry, Himachal Pradesh University, Summer Hill, Shimla-171 005 <em>Manuscript received 27 May 1996, revised 14 March 1997, accepted 16 May 1997</em> 4-t-Butylphenoxo-complexes of oxovanadium(v) of composition <strong>VOCl<sub>3-x</sub>(OC<sub>6</sub>H<sub>4</sub>Bu<sup>t</sup>-4)<sub>x</sub></strong>, where x = 1 → 3, react with 2-, 3- and 4- cyanopyridines to give adducts of varying composition. 2-Cyanopyridine forms adduct of 1 : 1 composition, coordinating simultaneously through pyridine as well as nitrile nitrogens of the ligand, while 3- and 4-cyanopyridines forms

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8

Wharf, Ivor, Ryszard Wojtowski, Carol Bowes, Anne-Marie Lebuis, and Mario Onyszchuk. "Spectroscopic studies of triphenyltin azide and of its adducts with O- and N-donor ligands; the crystal and molecular structures of triphenyltin azide and of azido(hexamethylphosphoramide)triphenyltin(IV)." Canadian Journal of Chemistry 76, no. 12 (1998): 1827–35. http://dx.doi.org/10.1139/v98-207.

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Complete far-IR and Raman data (<400 cm-1) are reported for triphenyltin azide (1) as well as for adducts Ph3SnN3·L (L = hexamethylphosphoramide (HMPA), triphenylphosphine oxide, pyridine-N-oxide, 4-picoline-N-oxide, or pyridine). The small changes in v(Sn-N3) noted on going from (1) to the adducts, as well as solid-state 119Sn nmr data, indicate that (1), like the adducts, has five-coordinate tin atoms. X-ray analysis shows that (1) crystallizes with two different chains of five-coordinate Ph3Sn units joined by 1,3-azide bridges. In one unit, the geometry around tin is similar to that foun

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9

Mbarki, Mohammed, Marc Oettinghaus, and Gerhard Raabe. "Quantum-chemical Ab Initio Calculations on the Donor–Acceptor Complex Pyridine–Borabenzene (C5H5N–BC5H5)." Australian Journal of Chemistry 67, no. 2 (2014): 266. http://dx.doi.org/10.1071/ch13407.

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The adduct of borabenzene (C5H5B) and pyridine (C5H5N) was studied by means of quantum-chemical ab initio and time-dependent density functional theory calculations at different levels of theory. In the fully optimized structure (MP2/6-311++G**) of the free donor–acceptor complex (C2), the C–B–C angle amounts to 120.6°. The planes of the two aromatic rings enclose a torsion angle of ~40° with a barrier to rotation about the B–N bond of less than 3 kcal mol–1 (1 kcal mol–1 = 4.186 kJ mol–1). The highest computational level applied in this study (complete basis set limit, coupled cluster with sin

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10

Mbarki, M., M. Oettinghaus, and G. Raabe. "Corrigendum to: Quantum-chemical Ab Initio Calculations on the Donor–Acceptor Complex Pyridine–Borabenzene (C5H5N–BC5H5)." Australian Journal of Chemistry 69, no. 5 (2016): 583. http://dx.doi.org/10.1071/ch13407_co.

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The adduct of borabenzene (C5H5B) and pyridine (C5H5N) was studied by means of quantum-chemical ab initio and time-dependent density functional theory calculations at different levels of theory. In the fully optimized structure (MP2/6-311++G**) of the free donor–acceptor complex (C2), the C–B–C angle amounts to 120.6°. The planes of the two aromatic rings enclose a torsion angle of ~40° with a barrier to rotation about the B–N bond of less than 3kcalmol–1 (1kcalmol–1=4.186kJmol–1). The highest computational level applied in this study (complete basis set limit, coupled cluster with single and

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11

Bowmaker, Graham A., Kevin C. Lim, Brian W. Skelton, and Allan H. White. "Syntheses, Structures and Vibrational Spectroscopy of Some Adducts of Copper(I) Cyanide with Pyridine Bases." Zeitschrift für Naturforschung B 59, no. 11-12 (2004): 1264–76. http://dx.doi.org/10.1515/znb-2004-11-1245.

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Abstract Synthetic and room temperature single crystal X-ray structural characterizations are recorded for adducts of copper(I) cyanide formed by crystallization of copper(I) cyanide from (unidentate) pyridine (‘py’) bases L, of 1:2 (L = py; new phase), 1:1.5 (L = 2-methylpyridine, ‘2mp’) and 1:1 (L = quinoline, ‘quin’) stoichiometries. All are single-stranded polymers, with successive copper atoms linked by single linear cyanide bridges (C,N disordered, individual components not resolved), with four- or three-coordinate N2Cu(CN)2 or NCu(CN)2 copper environments in the 1:2 and 1:1 adducts, the

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12

Raev, Lyubomir Dimitrov, Ivo Christov Ivanov, and Silviya Georgieva Agontseva. "Addition of some 6-amino-4-aryl-2(1H)-pyridones to phenylisocyanate and related reactions." Zeitschrift für Naturforschung B 74, no. 2 (2019): 191–95. http://dx.doi.org/10.1515/znb-2018-0184.

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AbstractThe Michael addition of enaminoesters to coumarins leads to the formation of the rearranged adduct 1 whose structure has been previously elucidated by X-ray crystallographic analysis. Now, N- and/or O-carbamoylation of the 6-amino-2-pyridone 1 by treatment with phenyl isocyanate in a molar ratio of 1:1 and 1:2 gave N-mono- (2a) or N,O-bis-(phenylcarbamoyl) (3) derivatives, respectively. Further transformations of the corresponding new 2-pyridone derivative 2a into the O-acetyl derivative 2b and the chromeno[3,4-c]pyridine 4 are reported as well.

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13

Graham, AJ, PC Healy, JD Kildea, and AH White. "Lewis-Base Adducts of Group 11 Metal(I) Compounds. XLVI. Synthesis and Conformational Systematics of Some Novel Polymeric Adducts of Pyridine-4-carbonitrile With Copper(I) Halides." Australian Journal of Chemistry 42, no. 1 (1989): 177. http://dx.doi.org/10.1071/ch9890177.

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The isolation and structural characterization of 1 : 1 adducts of copper(1) chloride (1) and bromide (2) with pyridine-4-carbonitrile (L) is described; crystals of the two complexes are isomorphous (monoclinic, P21/c, a ≈ 3.9, b ≈ 14.7, c ≈ 13.0 � , β ≈ 96°, Z 4; R0.047, 0.063 for No 630, 707 'observed' reflections respectively). Unlike the 1 : 1 adducts with the parent pyridine and benzonitrile ligands which are 'stair' polymers, these complexes comprise 'split-stair' strands woven into a two-dimensional sheet by crosslinking ambidentate ligands. Cu-N ( nitrile ) (1.942(9), 1.96(1) � ) are ap

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14

Sulekh, Chandra, and Sangeetika. "EPR and electronic spectral studies on copper(II) complexes of some N-O donor ligands." Journal of Indian Chemical Society Vol. 81, Mar 2004 (2004): 203–6. https://doi.org/10.5281/zenodo.5830391.

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Department of Chemistry, Zakir Husain College (University of Delhi), J. L Nehru Marg, New Delhi-110 002, India <em>E-mail:</em> schandra_00@yahoo.com <em>Manuscript received 16 October 2001, revised 24 June 2003, accepted 12 September 2003</em> Complexes, [Cu(ligand-H)<sub>2</sub>] of copper(II) with bidentate nitrogen-oxygen donor ligands, viz. 2-hydroxynaphthaldehydeoxime[hnoH<sub>2</sub>], 2-hydroxyacetophenoneoxime [haOH<sub>2</sub>], salicyladoxime [saIH<sub>2</sub>] and 2-hydroxypropiophenoneoxime [hmpH<sub>2</sub>] hate. been prepared. The complexes have square-planar geometry. The effe

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15

Plé, Nelly, Alain Turck, and Guy Queguiner. "Additions covalentes de nucléophiles sur les pyrido-as-triazines." Canadian Journal of Chemistry 70, no. 11 (1992): 2828–33. http://dx.doi.org/10.1139/v92-359.

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Covalent addition of various nucleophiles to pyrido-as-triazines was studied and the σ-adduct structures were determined by NMR. A remarkable reactivity toward carbon nucleophiles has been highlighted for pyrido-as-triazines bearing a pyridinic nitrogen in the β position: only in the pteridine series has a similar reactivity been encountered. Complete regioselectivity of the nucleophilic attack on the pyridine nucleus peri to the triazine was observed.

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16

Wharf, Ivor, Ryszard Wojtowski, and Mario Onyszchuk. "Adducts of diphenyllead diselenocyanate with some O- and N-donor ligands." Canadian Journal of Chemistry 63, no. 12 (1985): 3398–402. http://dx.doi.org/10.1139/v85-560.

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The preparation and properties of Ph2Pb(SeCN)2 have been reinvestigated. Infrared spectra show that the solid is polymeric with stronger Pb—Se and weaker Pb—N bonds. In N,N-dimethylformamide (DMF) solution v(CN) values are consistent with complete ionization to NCSe−, but coordinated N- and Se-bound selenocyanate species are observed when DMF/CH2CI2 mixtures are used as solvents. The first 1:2 adducts of Ph2Pb(SeCN)2 with hexamethylphosphoramide (HMPA), triphenylphosphine oxide (Ph3PO), pyridine-N-oxide (pyO), 2,4,6-collidine-N-oxide (collO), and dimethyl sulphoxide (DMSO) have been prepared,

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17

Murosaki, Ohno, Agou, Hashizume, and Matsuo. "Reaction of Dialumane Incorporating Bulky Eind Groups with Pyridines." Inorganics 7, no. 11 (2019): 129. http://dx.doi.org/10.3390/inorganics7110129.

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The reaction of the bulky Eind-based dialumane, (Eind)HAl(μ-H)2AlH(Eind) (1) (Eind = 1,1,3,3,5,5,7,7-octaethyl-s-hydrindacen-4-yl), with pyridines is described. When 1 was treated with pyridine (Py) in toluene, the Py adduct of aryldihydroalumane, Py→AlH2(Eind) (2), was initially formed. Then, the hydroalumination of Py took place to yield the Py-bound aryl(1,4-dihydropyrid-1-yl)hydroalumane, Py→AlH(1,4-dihydropyrid-1-yl)(Eind) (3). A similar reaction with a stronger Lewis base, 4-pyrrolidinopyridine (PPy), produced the stable PPy adduct, PPy→AlH2(Eind) (4). The resulting organoaluminum compou

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18

Wrackmeyer, Bernd, Elena V. Klimkina, and Wolfgang Milius. "1,3,2-Diazaalumina-[3]ferrocenophanes with Alkyn-1-yl Substituents at Aluminum." Zeitschrift für Naturforschung B 62, no. 10 (2007): 1259–66. http://dx.doi.org/10.1515/znb-2007-1005.

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The 1,3,2-diazaalumina-[3]ferrocenophane-ethyl(dimethyl)amine adduct 2, containing an Al-H function, reacts with terminal alkynes R-C≡C-H [R = nBu (a), tBu (b), Ph (c), SiMe3 (d)] by elimination of H2 to the amine adducts 4a - d containing an Al-C≡C-R function. Addition of pyridine leads to the corresponding pyridine adducts 5a - d, of which the molecular structure of 5d could be determined by single crystal X-ray diffraction. The formation of 4 is accompanied by side reactions such as trimerization of the alkynes to the 1,3,5-trisubstituted benzene derivatives 6a, c, and some polymerization o

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19

Mlowe, Sixberth, David J. Lewis, M. Azad Malik, et al. "Bis(piperidinedithiocarbamato)pyridinecadmium(ii) as a single-source precursor for the synthesis of CdS nanoparticles and aerosol-assisted chemical vapour deposition (AACVD) of CdS thin films." New J. Chem. 38, no. 12 (2014): 6073–80. http://dx.doi.org/10.1039/c4nj01201a.

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20

Wharf, Ivor, Lars Piehler, Bruce M. Sailofsky, Mario Onyszchuk, and Michel G. Simard. "Raman and far-infrared spectra of triphenyltin isochalcocyanates and their adducts with O- and N-donor ligands: the crystal and molecular structure of isocyanato-triphenyl (pyridine-N-oxide) tin." Canadian Journal of Chemistry 65, no. 3 (1987): 639–47. http://dx.doi.org/10.1139/v87-110.

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Solid state infrared and Raman data (350–100 cm−1) are reported for Ph3SnNCY (Y = O, S, Se) and their 1:1 adducts with hexamethylphosphoramide (HMPA), pyridine-N-oxide (pyO), 4-picoline-N-oxide (4-picO), triphenylphosphine oxide (Ph3PO), and pyridine (py), as well as for Ph3SnNCSe•L where L = β-pic (β-picoline) or γ-pic (γ-picoline), and assignments are given. The crystal structure of Ph3SnNCO•pyO was determined by single crystal X-ray analysis. The compound crystallizes in space group Pbca with a = 14.443(3), b = 16.676(4), c = 17.523(6) Å (−110 °C); Z = 8. The structure was solved by the dir

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21

Frohn, Hermann Josef, Thorsten Schroer, and Gerald Henkel. "Koordinationsverhalten des Pentafluorphenylxenonium Salzes [C6F5Xe]+[AsF6]- gegenüber Pyridinen unterschiedlicher Basizität / Co-ordinative Behaviour of the Pentafluorophenylxenonium Salt [C6F5Xe]+[AsF6]- to Pyridines of Different Basicity." Zeitschrift für Naturforschung B 50, no. 12 (1995): 1799–810. http://dx.doi.org/10.1515/znb-1995-1206.

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The arylxenonium cation in the salt [C6F5Xe]+ [AsF6]- is isoelectronic to C6F5I, but coordinatively unsaturated with respect to N-bases like MeCN and pyridines. Co-ordination of strongly basic pyridines causes weakening of the Xe-C bond and C6F1 radical formation. The thermal decomposition of pyridine co-ordinated arylxenonium cations gives three groups of products: C-pentafluorophenylated pyridines, N-pentafluorophenylated pyridinium and N-protonated pyridinium salts. The co-ordination ability of the different pyridines shows a good correlation (C6F5 group) with the 19F NMR shift values of th

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22

Brugos, Javier, Javier A. Cabeza, Pablo García-Álvarez, Enrique Pérez-Carreño та Juan F. Van der Maelen. "Octahedral manganese(i) and ruthenium(ii) complexes containing 2-(methylamido)pyridine–borane as a tripod κ3N,H,H-ligand". Dalton Transactions 46, № 12 (2017): 4009–17. http://dx.doi.org/10.1039/c7dt00378a.

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23

Semenov, S. G., and Yu F. Sigolaev. "Quantumchemical investigation of borabenzene adduct with pyridine." Russian Journal of General Chemistry 76, no. 12 (2006): 1925–29. http://dx.doi.org/10.1134/s1070363206120176.

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24

Ferguson, G., B. Kaitner, M. Myers, and T. R. Spalding. "Structure of 4-(dimethylamino)pyridine cyanoborane adduct." Acta Crystallographica Section C Crystal Structure Communications 46, no. 1 (1990): 125–26. http://dx.doi.org/10.1107/s0108270189005561.

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25

Cheng, Ji-xin, Yan Fang, Qun-jian Huang, Yi-Jing Yan, and Xiao-Yuan Li. "Blue-green photoluminescence from pyridine-C60 adduct." Chemical Physics Letters 330, no. 3-4 (2000): 262–66. http://dx.doi.org/10.1016/s0009-2614(00)01115-5.

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Shekar, Sukesh, and Seth N. Brown. "Mixed amidophenolate–catecholates of molybdenum(vi)." Dalton Trans. 43, no. 9 (2014): 3601–11. http://dx.doi.org/10.1039/c3dt53496k.

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Changing two catecholate ligands to amidophenolates tempers the Lewis acidity of tris(catecholato)molybdenum(vi), but seven-coordinate structures are still observed in the pyridine adduct or in a mixed catecholate-bridged dimer.

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Lee, Jin Heon, and Ho-Sang Shin. "Determination of hemoglobin adducts formed in rats exposed orally with 3,3′-dichlorobenzidine by GC/MS-SIM." Toxicology and Industrial Health 18, no. 4 (2002): 191–99. http://dx.doi.org/10.1191/0748233702th142oa.

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3,3?-dichlorobenzidine (DCB) can be metabolically N-acetylated and/or N-oxidized, and can form hemoglobin adducts. Gas chromatography/mass spectrometry-selected ion monitoring detection mode (GC/MS-SIM) could be a good analytical method to detect them. 4-Aminobiphenyl and phenanthrene-d10 were used as internal standards, and standard metabolites of DCB were synthesized from DCB. Pyridine is a promoter and acetic acid is a controller in the acetylation of DCB during titrating with acetyl chloride. After washing with acetone, the purity of N-acetyl DCB and N, N?-diacetyl DCB were 98.72% and 98.8

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Kivijärvi, Lauri, and Matti Haukka. "Crystal structure of the borabenzene–2,6-lutidine adduct." Acta Crystallographica Section E Crystallographic Communications 71, no. 12 (2015): o944. http://dx.doi.org/10.1107/s2056989015020599.

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In the title compound, C12H14BN, the complete molecule is generated by a crystallographic twofold axis, with two C atoms, the B atom and the N atom lying on the rotation axis. The dihedral angle between the borabenzene and pyridine rings is 81.20 (6)°. As well as dative electron donation from the N atom to the B atom [B—N = 1.5659 (18) Å], the methyl substituents on the lutidine ring shield the B atom, which further stabilizes the molecule. In the crystal, weak aromatic π–π stacking between the pyridine rings [centroid–centroid separation = 3.6268 (9) Å] is observed, which generates [001] colu

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Tuikka, Matti, and Matti Haukka. "Crystal structure of the pyridine–diiodine (1/1) adduct." Acta Crystallographica Section E Crystallographic Communications 71, no. 7 (2015): o463. http://dx.doi.org/10.1107/s2056989015010518.

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In the title adduct, C5H5N·I2, the N—I distance [2.424 (8) Å] is remarkably shorter than the sum of the van der Waals radii. The line through the I atoms forms an angle of 78.39 (16)° with the normal to the pyridine ring.

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30

Blanco, Susana, Alberto Macario та Juan Carlos López. "Pyridine–acetaldehyde, a molecular balance to explore the n→π* interaction". Physical Chemistry Chemical Physics 21, № 37 (2019): 20566–70. http://dx.doi.org/10.1039/c9cp04088a.

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Weak n→π* and C–H⋯O interactions determine the structure of pyridine–acetaldehyde adduct. The n→π* distance oscillates with the methyl group internal rotation which acts as a sort of molecular balance to explore the n→π* interaction energy.

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31

Engelhardt, LM, PC Healy, JD Kildea, and AH White. "Lewis-Base Adducts of Group 11 Metal(I) Compounds. LII. Synthesis and Structural Characterization of Mononuclear Chloro- and Bromo-pyridinebis-(triphenylphosphine)silver(I) Complexes." Australian Journal of Chemistry 42, no. 6 (1989): 907. http://dx.doi.org/10.1071/ch9890907.

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The mononuclear adducts chloro - and bromo-pyridinebis (triphenylphosphine)silver have been synthesized and structurally characterized by single-crystal X-ray diffraction methods. The two complexes are isomorphous, monoclinic, space group P21 or P21/m, a ≈ 9.8, b ≈ 20.0, c ≈ 9.1 � , β ≈ 97.5�, Z 2; in space group P21/m, they were refined to residuals of 0.038, 0.036 for 2392, 2157 'observed' reflections respectively. No comparable iodide adduct has been isolated. In both structures the silver atom is four-coordinate; Ag-Cl,Br are 2.511(2), 2.629(1) �; Ag-P, 2.472(1), 2.476(1) �, and Ag-N, 2.58

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32

Li, Shu An, Run Lai Li, Zhen Ming Zhang, Kai Zhu, and Guang Jie Wang. "Improved Preparation of 2,2-Dithiobis(Pyridine-N-Oxide)." Advanced Materials Research 554-556 (July 2012): 868–73. http://dx.doi.org/10.4028/www.scientific.net/amr.554-556.868.

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2,2-Dithiobis(pyridine-N-oxide) (1) was prepared by reacting 2-pyridinethiol-N-oxide (2) and hydrogen peroxide-urea adduct (3) at the molar ratio of 1:1.25 and 45oC for 1.75h in high yield and purity of 91.6% and 99.6% respectively. The structures of product were characterized by IR, NMR.

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33

Drebushchak, Tatiana N., Mikhail A. Mikhailenko, Elena V. Boldyreva, and Tatyana P. Shakhtshneider. "Monoclinic polymorph of the 1:1 adduct of sulfathiazole with pyridine." Acta Crystallographica Section E Structure Reports Online 62, no. 7 (2006): o2707—o2709. http://dx.doi.org/10.1107/s1600536806020071.

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The asymmetric unit of the title compound, C9H9N3O2S2·C5H5N, contains a sulfathiazole and a pyridine molecule linked via N—H...N hydrogen bonds, as in the tetragonal polymorph. The monoclinic polymorph is unstable in air at ambient conditions and loses pyridine giving sulfathiazole. The monoclinic polymorph belongs to the class of disappearing polymorphs; it was the first polymorph to be obtained, but could not be obtained again, after the tetragonal polymorph was crystallized.

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34

Sharif, Shasad, Douglas R. Powell, David Schagen, et al. "X-ray crystallographic structures of enamine and amine Schiff bases of pyridoxal and its 1:1 hydrogen-bonded complexes with benzoic acid derivatives: evidence for coupled inter- and intramolecular proton transfer." Acta Crystallographica Section B Structural Science 62, no. 3 (2006): 480–87. http://dx.doi.org/10.1107/s0108768105040590.

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Crystal structures of Schiff bases containing pyridoxal (PL), N-(pyridoxylidene)-tolylamine, C15H16N2O2 (I), N-(pyridoxylidene)-methylamine, C9H12N2O2 (III), and their 1:1 adduct with 2-nitrobenzoic acid, (I)+ C7H4NO_4^- (II), and 4-nitrobenzoic acid, (III)+ C7H4NO_4^- (IV), serve as models for the coenzyme pyridoxal-5′-phosphate (PLP) in its PLP-dependent enzymes. These models allow the study of the intramolecular OHN hydrogen bond of PL/PLP Schiff bases and the H-acceptor properties of their pyridine rings. The free base (I) forms hydrogen-bonded chains involving the hydroxyl side groups and

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35

Wrackmeyer, Bernd, and Heidi E. Maisel. "2-Stannylpyridine-Borane Adducts - Multinuclear Magnetic Resonance Study and X-Ray Structure Determination of a 1,4-Dihydro-4 a,1,4-azastannabora-naphthalene Derivative." Zeitschrift für Naturforschung B 50, no. 5 (1995): 809–15. http://dx.doi.org/10.1515/znb-1995-0520.

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Abstract The adduct formation between 2-trimethylstannyl-pyridine (1) and triethylborane, leading to 2a, and 9-borabicyclo[3.3.1]nonane, leading to 2b, was studied by 1H, 11B, 13C, 15N and 119Sn NMR in solution. Changes in the magnitude of the coupling constants J(119Sn, 13C), with respect to the data for I, were analysed. The absolute signs have been determined [all coupling constants nJ(119SnZ3C) to methyl and pyridine carbon atoms in 1 to 3 possess a negative sign and the same is true for nJ(119Sn,1H) of the pyridine hydrogen atoms] by various two-dimensional NMR experiments, and attributed

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36

Saitoh, Yutaka, Take-aki Koizumi, Kohtaro Osakada, and Takakazu Yamamoto. "Preparation of symmetric dibromides of 1,10-phenanthroline." Canadian Journal of Chemistry 75, no. 10 (1997): 1336–39. http://dx.doi.org/10.1139/v97-160.

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Bromation of 1,10-phenanthroline with Br2 proceeds smoothly in the presence of S2Cl2 and pyridine to give 3,8-dibromo-1,10-phenanthroline in good yield. Bromation of 2,9-dibutoxy-1,10-phenanthroline with Br2, in an aqueous medium gives 5,6-dibromo-2,9-dibutoxy-1,10-phenanthroline selectively. Similar bromination of 4,7-dibutoxy-1,10-phenanthroline with Br2 gives 3,8-dibromo-4,7-dibutoxy-1,10-phenanthroline, which forms a 1:1 adduct with Cu(NO3)2. Molecular structure of the 1:1 adduct has been determined by X-ray crystallography. Keywords: bromination, 1,10-phenanthroline, 3,8-dibromo-1,10-phen

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37

Bellamri, Medjda, Yi Wang, Kim Yonemori, et al. "Biomonitoring an albumin adduct of the cooked meat carcinogen 2-amino-1-methyl-6-phenylimidazo[4,5-b]pyridine in humans." Carcinogenesis 39, no. 12 (2018): 1455–62. http://dx.doi.org/10.1093/carcin/bgy125.

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Abstract 2-Amino-1-methyl-6-phenylimidazo[4,5-b]pyridine (PhIP) is formed in cooked meats and may be linked to dietary-associated colorectal, prostate and mammary cancers. Genotoxic N-oxidized metabolites of PhIP react with the Cys34 of albumin (Alb) to form a sulfinamide adduct, a biomarker of the biologically effective dose. We examined the kinetics of PhIP-Alb adduct formation in plasma of volunteers on a 4-week semicontrolled diet of cooked meat containing known quantities of PhIP. The adduct was below the limit of detection (LOD) (10 femtograms PhIP/mg Alb) in most subjects before the mea

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38

Averbuch-Pouchot, M. T., and M. Meisel. "Structure of the pyridine adduct of dithiophosphoryl monochloride." Acta Crystallographica Section C Crystal Structure Communications 45, no. 12 (1989): 1937–39. http://dx.doi.org/10.1107/s010827018900452x.

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39

Rotter, Christiane, Camilla Evangelisti, Stefanie Schönberger, Thomas M. Klapötke, and Konstantin Karaghiosoff. "py2P2S7: a bis(pyridine)adduct stabilized phosphorus sulfide." Chemical Communications 46, no. 27 (2010): 5024. http://dx.doi.org/10.1039/c0cc00106f.

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40

Smith, Graham, Urs D. Wermuth, Peter C. Healy, and Jonathan M. White. "Structure-Making with 3,5-Dinitrosalicylic Acid. II. The Proton-Transfer Compounds of 3,5-Dinitrosalicylic Acid with the Monocyclic Heteroaromatic Amines." Australian Journal of Chemistry 56, no. 7 (2003): 707. http://dx.doi.org/10.1071/ch02163.

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The crystal structures of the proton-transfer compounds of 3,5-dinitrosalicylic acid (dnsa) with a series of common monocyclic heteroaromatic amines (pyridine, 4-cyanopyridine, pyridine-4-carboxylic acid, 2,6-diaminopyridine, and 2-aminopyrimidine) have been determined and the hydrogen-bonding associations in each analyzed. The compounds are the adduct [(C5H6N)+(dnsa)–· (dnsa)] (1), the 1 : 1 salts [(C6H5N2)+(dnsa)–] (2), [(C6H6NO2)+(dnsa)–] (3), [(C5H8N3)+(dnsa)–] (4), and the 2 : 2 ethanol hemi-solvate [2(C4H6N3)+·2(dnsa)–· 0.5(EtOH)] (5). With all compounds, protonation of the hetero-nitrog

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41

Donzello, Maria Pia, Elena Puglisi, Claudio Ercolani, et al. "Tetra-2,3-pyrazinoporphyrazines with peripherally appended pyridine rings. 21. Mono- and pentanuclear FeII complexes: Solid state and solution studies." Journal of Porphyrins and Phthalocyanines 24, no. 05n07 (2020): 725–36. http://dx.doi.org/10.1142/s1088424619502018.

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New Fe[Formula: see text] complexes of formula [Py8TPyzPzFe] · xH2O, its bis-pyridine adduct [Py8TPyzPzFe(py)2] · xH2O, the pentanuclear species [(MCl[Formula: see text]Py8TPyzPzFe] · xH2O (M [Formula: see text] Pd[Formula: see text], Pt[Formula: see text] and the bis-DABCO adducts [Py8TPyzPzFe(DABCO)2] · 11H2O and [(PdCl[Formula: see text]Py8TPyzPzFe(DABCO)2] · H2O (Py8TPyzPz [Formula: see text] octapyridino-tetrapyrazinoporphyrazinato dianion; DABCO [Formula: see text] 1,4-diazabiciclo[2.2.2]octane) were synthesized and characterized by elemental and thermogravimetric analysis, IR and UV-vis

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42

Doğanç, Fatıma, and Ali Hakan Göker. "N-Alkylation of Some Imidazopyridines." Fabad Journal of Pharmaceutical Sciences 50, no. 1 (2025): 15–20. https://doi.org/10.55262/fabadeczacilik.1577453.

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6-Bromo-2-(4-(4-fluorophenoxy)phenyl)-4H-imidazo[4,5-b]pyridine (I) and 2-[4-(4-fluorophenoxy)phenyl]-5H-imidazo[4,5-c]pyridine (III) were prepared by the reaction of 5-bromo-2,3-diaminopyridine and 3,4-diaminopyridine with sodyum metabisulfite adduct of 4-(4-fluorophenoxy)benzaldehyde (1), respectively. Alkylation of these compounds with 1-(chloromethyl)-4-methoxybenzene under basic conditions (K2CO3) in DMF) were formed as mainly N4 regioisomer (II) and N5 regioisomer (IV). Their regioisomeric structures were assigned with 2D-NOESY (Nuclear Overhauser Effect Spectroscopy) spectra.

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43

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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44

Tessema, Eskedar, Vijayanath Elakkat, Chiao-Fan Chiu, et al. "Recoverable Phospha-Michael Additions Catalyzed by a 4-N,N-Dimethylaminopyridinium Saccharinate Salt or a Fluorous Long-Chained Pyridine: Two Types of Reusable Base Catalysts." Molecules 26, no. 4 (2021): 1159. http://dx.doi.org/10.3390/molecules26041159.

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Phospha-Michael addition, which is the addition reaction of a phosphorus-based nucleophile to an acceptor-substituted unsaturated bond, certainly represents one of the most versatile and powerful tools for the formation of P-C bonds, since many different electrophiles and P nucleophiles can be combined with each other. This offers the possibility to access many diversely functionalized products. In this work, two kinds of basic pyridine-based organo-catalysts were used to efficiently catalyze phospha-Michael addition reactions, the 4-N,N-dimethylaminopyridinium saccharinate (DMAP·Hsac) salt an

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45

Bowmaker, Graham A., Effendy, Peter C. Junk, Brian W. Skelton, and Allan H. White. "Syntheses, Structures and Vibrational Spectroscopy of Some Adducts of Silver(I) Cyanide with (Oligo-)Pyridine Bases." Zeitschrift für Naturforschung B 59, no. 11-12 (2004): 1277–92. http://dx.doi.org/10.1515/znb-2004-11-1246.

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Abstract Crystalline materials obtained by the crystallization of silver(I) cyanide from/with a variety of (oligo-)pyridine bases, L, of various bulk, have been characterized by room temperature single crystal X-ray structure determination. From L = quinoline (= ’quin’), AgCN : quin (1:2), is obtained, the structure being a single-stranded polymer, the successive silver atoms located on two-fold axes linked by linearly bridging cyanide groups and four-coordinate, the other two coordination sites being occupied by symmetry related quinoline nitrogen atoms. From L = 2,4,6-trimethylpyridine (‘col

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46

Mautner, Franz A., Harald Krischner, and Christoph Kratky. "Darstellung und Kristallstruktur von Zinkazid · 4-Methylpyridin / Preparation and Crystal Structure of Zinc Azide · 4-Methylpyridine." Zeitschrift für Naturforschung B 43, no. 3 (1988): 253–56. http://dx.doi.org/10.1515/znb-1988-0302.

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Zinc azide · 4-methylpyridine (1) is formed by the reaction of zinc azide with the corresponding pyridine in aqueous solution. The crystal structure was determined by single crystal X-ray diffraction methods. The crystals of 1 are monoclinic, space group C2/c, Z = 4, a = 1085.5(2), b = 1692.7(11), c = 619.7(6) pm, β = 113.47(5)°. Each zinc atom is surrounded by five nitrogen atoms (four from azide groups and one from the pyridine adduct) in a distorted trigonal bipyramidal fashion. The ZnN5-polyhedra share common edges to form chains along the crystallographic c-axis.

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47

Naka, Akinobu, and Hisayoshi Kobayashi. "Rhodium-Catalyzed Trans-Bis-Silylation Reactions of 2-Ethynyl-3-pentamethyldisilanylpyridines." Molecules 28, no. 8 (2023): 3284. http://dx.doi.org/10.3390/molecules28083284.

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Rhodium-catalyzed reactions of 2-ethynyl-3-pentamethyldisilanylpyridine derivatives (1 and 2) are reported. The reactions of compounds 1 and 2 in the presence of catalytic amounts of rhodium complexes at 110 °C gave the corresponding pyridine-fused siloles (3) and (4) through intramolecular trans-bis-silylation cyclization. The reaction of 2-bromo-3-(1,1,2,2,2-pentamethyldisilanyl)pyridine with 3-phenyl-1-propyne in the presence of PdCl2(PPh3)2-CuI catalysts afforded 1:2 bis-silylation adduct 6. DFT calculations were also performed to understand the reaction mechanism for the production of com

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48

Shooter, Jesse, Caleb J. Allen, Colby W. K. Tinsley, Lev N. Zakharov, and Eric R. Abbey. "Crystal structure and Hirshfield analysis of the 4-(dimethylamino)pyridine adduct of 4-methoxyphenylborane." Acta Crystallographica Section E Crystallographic Communications 73, no. 11 (2017): 1747–50. http://dx.doi.org/10.1107/s2056989017015171.

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The title compound [systematic name: 4-(dimethylamino)pyridine–4-methoxyphenylborane (1/1)], C14H19BN2O, contains two independent molecules in the asymmetric unit. Both molecules exhibit coplanar, mostlysp2-hybridized methoxy and dimethylamino substituents on their respective aromatic rings, consistent with π-donation into the aromatic systems. The B—H groups exhibit an intramolecular close contact with a C—H group of the pyridine ring, which may be evidence of electrostatic attraction between the hydridic B—H and the electropositive aromatic C—H. There appears to be weak C—H...π(arene) intera

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49

Pinet, Sandra, Mathieu Pucheault, Virginie Liautard, and Mégane Debiais. "Radical Metal-Free Borylation of Aryl Iodides." Synthesis 49, no. 21 (2017): 4759–68. http://dx.doi.org/10.1055/s-0036-1588431.

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A simple metal-free borylation of aryl iodides mediated by a fluoride sp2–sp3 diboron adduct is described. The reaction conditions are compatible with various functional groups. Electronic effects of substituents do not affect the borylation while steric hindrance does. The reaction proceeds via a radical mechanism in which pyridine serves to stabilize the boryl radicals, generated in situ.

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50

Mootz, Dietrich, and Jörg Hocken. "Das System Pyridin-Chlorwasserstoff: Bildung und Struktur kristalliner Addukte / The System Pyridine-Hydrogen Chloride: Formation and Structure of Crystalline Adducts." Zeitschrift für Naturforschung B 44, no. 10 (1989): 1239–46. http://dx.doi.org/10.1515/znb-1989-1017.

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The melting diagram of the system pyridine-hydrogen chloride was determined by DTA. It reveals the existence of intermediary solid complexes pyridine · xHCl with x = 0.5, 1, 2, 4 and 6. The structures of those with x = 1 (room-temperature phase), 2, 4 and 6 were determined from single-crystal MoKa diffractometer data at low temperatures. Pyridinium and chloride ions and, with the exception of the mono-adduct, hydrogen chloride molecules are hydrogen-bonded into various discrete molecular and complex-ionic structural units. Among these are the first poly-(hydrogen chloride) anions, HnCln+1- or

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