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Journal articles on the topic 'Dihydro-1,2 pyridines chirales'

Author: Grafiati

Published: 4 June 2021

Last updated: 3 February 2022

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1

Wolińska, Ewa. "Chiral oxazoline ligands with two different six-membered azaheteroaromatic rings – synthesis and application in the Cu-catalyzed nitroaldol reaction." Heterocyclic Communications 22, no. 2 (2016): 85–94. http://dx.doi.org/10.1515/hc-2016-0001.

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AbstractSynthesis and catalytic activity of chiral ligands 5,6-diphenyl-3-{3-[(4S/R)-4-R/Ar-4,5-dihydro-1,3-oxazol-2-yl]pyridin-2-yl}amino-1,2,4-triazines 2 and their analogs 3 possessing an N-oxide function in the pyridine ring are described. The pivotal step in the synthesis of ligands 2 is the Buchwald-Hartwig Pd-catalyzed cross-coupling reaction between 3-bromo-5,6-diphenyl-1,2,4-triazine (7a) and enantiopure 3-(4,5-dihydro-1,3-oxazol-2-yl)pyridin-2-amines 6a–d. Aromatic nucleophilic substitution of chlorine in 3-chloro-5,6-diphenyl-1,2,4-triazine (7b) with 3-(4,5-dihydro-1,3-oxazol-2-yl)p

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2

Wolińska, Ewa, Waldemar Wysocki, Danuta Branowska, and Zbigniew Karczmarzyk. "Synthesis and structures of three new pyridine-containing oxazoline ligands of complexes for asymmetric catalysis." Acta Crystallographica Section C Structural Chemistry 77, no. 9 (2021): 529–36. http://dx.doi.org/10.1107/s2053229621008202.

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Three new chiral pyridine-containing oxazoline derivatives with fluorine and perfluoromethyl groups, namely, 2-({2-[(4S)-4-phenyl-4,5-dihydro-1,3-oxazol-2-yl]phenyl}amino)-5-(trifluoromethyl)pyridine, C21H16F3N3O, 2-({5-fluoro-2-[(4S)-4-isopropyl-4,5-dihydro-1,3-oxazol-2-yl]phenyl}amino)-5-(trifluoromethyl)pyridine, C18H17F4N3O, and 2-({2-[(3aR,8aS)-8,8a-dihydro-3aH-indeno[1,2-d]oxazol-2-yl]phenyl}amino)-5-(trifluoromethyl)pyridine, C22H16F3N3O, as chiral ligands in metal-catalysed asymmetric reactions, were synthesized and characterized by spectral and X-ray diffraction methods. The conformat

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3

Ma, Kuoyan, Liang Cheng, Han-Mou Gau, and Jingsong You. "A new chiral ligand: 2,6-bis[4(S)-isopropyl-1-phenyl-4,5-dihydro-1H-imidazol-2-yl]pyridine." Acta Crystallographica Section E Structure Reports Online 62, no. 4 (2006): o1595—o1597. http://dx.doi.org/10.1107/s1600536806009846.

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The title compound, C29H33N5, is a new chiral bis(imidazolyl)pyridine derivative with a skeleton similar to the bis(oxazolyl)pyridine derivatives, which have been extensively used as ligands in various asymmetric catalytic reactions. The most prominent feature of the present compound is the considerable sp 2 character of N atoms of the imidazoline rings. The substituents at the Nsp 2 atoms can provide a means for tuning the electronic and conformational properties of the compound.

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4

Amr, Abd El-Galil E., Ashraf M. Mohamed, and Alhussein A. Ibrahim. "Synthesis of Some New Chiral Tricyclic and Macrocyclic Pyridine Derivatives as Antimicrobial Agents." Zeitschrift für Naturforschung B 58, no. 9 (2003): 861–68. http://dx.doi.org/10.1515/znb-2003-0908.

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A series of chiral macrocyclic pyridines has been prepared starting from N2,N2-(pyridine- 2,6-dicarbonyl)diamino acid hydrazides (2a-c) and N,N-bis-(1-carboxy-2-substituted)-2,6- diaminocarbonyl)pyridines (3a,b). The coupling of (2a-c) with 2,6-pyridine dicarbonyldichloride (4) gave the compounds (5a-c). Compounds 2a-c were coupled with 2,6-diacetylpyridine (6) to yield compounds (7a-c) and with heterocyclic aldehydes (8) or (10) to give the compounds (9a-c) or (11a-c). In addition, the hydrazides (2a-c) were reacted with diformylcalix[4]arene 12 to afford the macrocyclic calix[4]arene hydrazo

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5

Wu, Jian Yi, Li Zhang, Li Ling Cai, and Yang Zhang. "Catalyzing Synthesis of Chiral Nitrendipine." Advanced Materials Research 518-523 (May 2012): 3943–46. http://dx.doi.org/10.4028/www.scientific.net/amr.518-523.3943.

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This paper describes the chiral synthesis of R-2,6-dimethyl-4-(3-nitro phenyl)-1,4- dihydro-pyridine-3,5-dicarboxylic acid 3-ethyl ester 5-methyl ester (R-Nitrendipine) using chiral phase transfer catalyst. The structure of the obtained nitrendipine crystals was determined with single crystal X-ray diffraction. The crystal is monoclinic, with the space group of P21/c and unit cell constants of a=8.8577(15), b=15.581(3), c=12.999(2)Å, β=92.458(4)°, V=1792.3(5)Å3, Z=4, Dc =1.335g/cm3, F(000)=760. X-ray analysis reveals that the product is a chiral nitrendipine with R-configuration of the dihydro

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6

Devika, Neelakandan, Nandhagopal Raja, Subbiah Ananthalakshmi та Bruno Therrien. "Crystal structure of chlorido(2-{1-[2-(4-chlorophenyl)hydrazin-1-ylidene-κN]ethyl}pyridine-κN)(η5-pentamethylcyclopentadienyl)rhodium(III) chloride". Acta Crystallographica Section E Crystallographic Communications 71, № 3 (2015): 248–50. http://dx.doi.org/10.1107/s205698901500184x.

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The cation of the title compound, [Rh(η5-C5Me5)Cl(C13H12ClN3)]Cl, adopts a typical piano-stool geometry. The complex is chiral at the metal and crystallizes as a racemate. Upon coordination, the hydrazinylidenepyridine ligand is non-planar, an angle of 54.42 (7)° being observed between the pyridine ring and the aromatic ring of the [2-(4-chlorophenyl)hydrazin-1-ylidene]ethyl group. In the crystal, a weak interionic N—H...Cl hydrogen bond is observed.

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7

Binay, P., G. Dupas, J. Bourguignon, and G. Queguiner. "Nouveaux modèles du NADH en série oxazolyl-3 dihydro-1,4 pyridine: synthèse, réactivité, rôle de la complexation dans la réactivité." Canadian Journal of Chemistry 65, no. 3 (1987): 648–55. http://dx.doi.org/10.1139/v87-111.

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A new class of NADH models is described: they contain the 3-oxazolyl-1,4-dihydropyridine structure. They have been synthesized by regioselective addition at the 4 position of organometallic derivatives (one of them bearing a chiral group) on 3-(4,4-dimethyl-2-oxazolyl)pyridine. The 1,4-dihydropyridine structure is obtained after quaternarization and reduction by sodium dithionite. Quaternarization through Zincke's reaction leads to models having a chiral group at the pyridine nitrogen. This chirality is necessary to induce asymmetry at the 4 carbon in the corresponding 1,4-dihydropyridine. Thi

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8

Zhang, Xiao-Min, Xue-Feng Feng, Jian-Qiang Li, and Feng Luo. "Synthesis, Structures, and Properties of Four Novel HgII Complexes Based on Pyridine Acylamide Ligands." Australian Journal of Chemistry 68, no. 1 (2015): 80. http://dx.doi.org/10.1071/ch14110.

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In this work we synthesised four new pyridine acylamide complexes [HgI2(L1)] (1) and (2), [HgI2(L2)2] (3), and [HgI2(L3)]n (4) (L1 = N,N′-bis(3-pyridylmethyl)benzene-1,4-dicarboxamide, L2 = N4,N4′-bis(pyridin-3-yl)-[1,1′-biphenyl]-4,4′-dicarboxamide, L3 = N1,N3-bis(pyridin-3-ylmethyl)isophthalamide) by solvo(hydro)thermal reaction. Compounds 1 and 2 are supramolecular isomers prepared via variation of the reaction solvent, in which the HgII centres are bridged by L1 ligands to form one-dimensional (1D) helical chain or 1D meso-helical chain, respectively. Careful inspection of the structures r

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9

Mayans, Julia, Angeliki A. Athanasopoulou, Amy Trinh Pham, et al. "{Ni4} Cubanes from enantiomerically pure 2-(1-hydroxyethyl)pyridine ligands: supramolecular chirality." Dalton Transactions 48, no. 28 (2019): 10427–34. http://dx.doi.org/10.1039/c9dt01026b.

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10

Li, Jian-Ping, and Jian-She Zhao. "{2,6-Bis[(4R)-4-ethoxyoxazolin-2-yl]pyridine}dichloromanganese(II)." Acta Crystallographica Section E Structure Reports Online 62, no. 4 (2006): m810—m812. http://dx.doi.org/10.1107/s1600536806009287.

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The title compound, [MnCl2(C15H19N3O2)], was synthesized from the chiral ligand (R,R)-et-pybox {(R,R)-et-pybox is 2,6-bis[(4R)-4-ethoxyoxazolin-2-yl]pyridine}. The complex is mononuclear and its Mn atom has a distorted trigonal–bipyramidal coordination environment. In the complex, (R,R)-et-pybox is coordinated in a tridentate fashion to the Mn atom via three N atoms, having a pybox–cation ratio of 1:1.

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11

Amr, Abdel-Galil E. "Synthesis of Some New Linear and Chiral Macrocyclic Pyridine Carbazides as Analgesic and Anticonvulsant Agents." Zeitschrift für Naturforschung B 60, no. 9 (2005): 990–98. http://dx.doi.org/10.1515/znb-2005-0914.

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A series of 2,6-disubstituted pyridine derivatives were prepared from 2,6-diacetylpyridine or 2,6- dicarbonyl pyridine dichloride as starting materials. Reaction of 2,6-diacetylpyridine 1 with hydroxylamine hydrochloride or different aromatic aldehydes afforded the corresponding 2,6-diacetylpyridine dioxime and 2,6-bis-[β -(2-thienyl)acryloyl]pyridine derivatives 2 and 3, respectively. Additionally, N2,N2‘-(pyridine-2,6-dicarbonyl)-L-amino acid hydrazides 5 were prepared starting from 2,6- dicarbonyl pyridine dichloride via the corresponding esters 4. Compound 3 was reacted with hydroxylamine

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12

House, DA, PJ Steel, and AA Watson. "Chiral Heterocyclic Ligands. II. Synthesis and Palladium(II) Complexes of Chiral Pyrazolylmethyl-Pyridines and Pyrazolylmethyl-Pyrazoles." Australian Journal of Chemistry 39, no. 10 (1986): 1525. http://dx.doi.org/10.1071/ch9861525.

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The syntheses of the pyrazolylmethylpyridines (5a-c), their chiral derivatives (7) and (8), and the chiral methylenebisindazoles (9)-(11) are reported. These bidentate ligands form stable 1 : 1 complexes with PdCl2. A single-crystal X-ray structure determination of dichloro [(4S,7R)-7,8,8-trimethyl-2-(pyridin-2-ylmethyl)-4,5,6,7-tetrahydro-4,7-methano-2H-indazole]palladium(II),(16), is also reported.

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13

Arseniyadis, Stellios, Mohan Mahesh, Paul McDaid, Thomas Hampel, Stephen G. Davey, and Alan C. Spivey. "Studies towards the N-acylative kinetic resolution of NOBIN." Collection of Czechoslovak Chemical Communications 76, no. 10 (2011): 1239–53. http://dx.doi.org/10.1135/cccc2011034.

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An investigation into the N-acylation of atropisomeric anilines 8 and 2, which are related to NOBIN (1), catalysed by small molecule chiral pyridine-based nucleophilic catalysts is described. The first organocatalytic kinetic resolution (KR) of an atropisomeric aniline is described.

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14

Brunner, Henri, Reinhard J. Maier, and M. Zabel. "Enantioselective Catalysis, 139 [1]. A Chiral Cyclic Amidine Containing a Pyridine Substituent - Synthesis, Coordination Chemistry, Catalysis." Zeitschrift für Naturforschung B 56, no. 10 (2001): 975–78. http://dx.doi.org/10.1515/znb-2001-1003.

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Reaction of the 1,3-diamine 1 with the methylester of /V,/V-dimethyl-L-phenylalanine 2 afforded the chiral cylic amidine 4 with a pyridine substituent. The CuCl2 complex of the hydrochloride of ligand 4 has the structure of a trigonal bipyramide. In the Cu-catalyzed cyclopropanation of styrene with ethyl diazoacetate the new multi-nitrogen ligand gave optical inductions up to 15% ee.

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15

Rheam, Rachel E., Matthias Zeller, and Curtis M. Zaleski. "Crystal structures of three anionic lanthanide–aluminium [3.3.1] metallacryptate complexes." Acta Crystallographica Section E Crystallographic Communications 76, no. 9 (2020): 1458–66. http://dx.doi.org/10.1107/s2056989020010725.

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The three isomorphous [3.3.1] metallacryptate complexes bis(pyridinium) diaquadipyridinehexakis[μ3-salicylhydroximato(3−)]bis[μ2-salicylhydroximato(1−)]hexaaluminiumgadolinium–pyridine–water (1/7.396/1), (C5H6N)2[GdAl6(C7H6NO3)2(C7H4NO3)7(C5H5N)1.855(H2O)2]·7.396C5H5N·H2O or [Hpy]2[GdAl6(H2shi)2(shi)7(py)1.855(H2O)2]·7.396py·H2O, 1, bis(pyridinium) diaquadipyridinehexakis[μ3-salicylhydroximato(3−)]bis[μ2-salicylhydroximato(1−)]hexaaluminiumdysprosium–pyridine–water (1/7.429/1), (C5H6N)2[DyAl6(C7H6NO3)2(C7H4NO3)7(C5H5N)1.855(H2O)2]·7.429C5H5N·H2O or [Hpy]2[DyAl6(H2shi)2(shi)7(py)1.891(H2O)2]·7.

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16

Cho, Juhyun, Jong Hwa Jeong, Myung Won Lee, and Youn K. Kang. "Interrogation of fractional crystallization behavior of a newly exploited chiral resolution method for racemic 1-(pyridin-2-yl)ethylamine via DFT-D3 calculations of cohesive energy." Inorganic Chemistry Frontiers 6, no. 9 (2019): 2325–38. http://dx.doi.org/10.1039/c9qi00523d.

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17

BOUTEAU, B., J. L. IMBS, J. C. LANCELOT, M. BARTHELMEBS, and M. ROBBA. "ChemInform Abstract: Synthesis and Salidiuretic Activity of 2,3-Dihydro-8-(1-pyrrolyl)-1,2, 4-triazolo(4,3-a)pyridines and 5,6-Dihydro-4H-pyrido(2,3-c)pyrrolo-(1, 2-e)-1,2,5-triazepines." ChemInform 22, no. 43 (2010): no. http://dx.doi.org/10.1002/chin.199143162.

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18

Qin, Tao, Zhe Feng, Jie Yang, Xuan Shen, and Dunru Zhu. "Unprecedented three-dimensional hydrogen-bonded hex topological chiral lanthanide–organic frameworks built from an achiral ligand." Acta Crystallographica Section C Structural Chemistry 74, no. 11 (2018): 1403–12. http://dx.doi.org/10.1107/s205322961801313x.

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The design and preparation of chiral metal–organic frameworks (CMOFs) from achiral ligands are a big challenge. Using 3-nitro-4-(pyridin-4-yl)benzoic acid (HL) as a new linker, a total of eight chiral lanthanide–organic frameworks (LOFs), namely poly[diaquatris[μ2-3-nitro-4-(pyridin-4-yl)benzoato-κ2 O:O′]lanthanide(III)], L- and D-[Ln(C12H7N2O4)3(H2O)2] n [(1), Ln = Eu; (2), Ln = Gd; (3), Ln = Dy; (4), Ln = Tb], were hydrothermally synthesized without chiral reagents and determined by X-ray crystallography. Crystal structure analyses show that L-(1)–(4) crystallize in the hexagonal P65 space g

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19

Kim, Yechan, Seoung-Tae Kim, Dahye Kang, et al. "Stereoselective construction of sterically hindered oxaspirocycles via chiral bidentate directing group-mediated C(sp3)–O bond formation." Chemical Science 9, no. 6 (2018): 1473–80. http://dx.doi.org/10.1039/c7sc04691j.

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A new, bidentate, chiral directing group derived from 2,2-dimethyl-1-(pyridin-2-yl)propan-1-amine was discovered, which enables stereoselective palladium(ii)-catalyzed intramolecular C(sp<sup>3</sup>)–O bond formation.

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20

Papanikolaou, Michael G., Alexander Elliott, James McAllister, et al. "Electrocatalytic hydrogen production by dinuclear cobalt(ii) compounds containing redox-active diamidate ligands: a combined experimental and theoretical study." Dalton Transactions 49, no. 44 (2020): 15718–30. http://dx.doi.org/10.1039/d0dt02617d.

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The chiral dicobalt(ii) complex [Co<sup>II</sup><sub>2</sub>(μ<sub>2</sub>-L)<sub>2</sub>] (1) (H<sub>2</sub>L = N<sup>2</sup>,N<sup>6</sup>-di(quinolin-8-yl)pyridine-2,6-dicarboxamide) and its tert-butyl analogue [Co<sup>II</sup><sub>2</sub>(μ<sub>2</sub>-LBu)<sub>2</sub>] (2) were structurally characterized and their catalytic evolution of H<sub>2</sub> was investigated.

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21

AlMarzouq, Douaa Salman. "Reactions under increased pressure: The reactivity of functionally substituted 3-oxo-2-arylhydrazones toward active methylene reagents in Q-tube." European Journal of Chemistry 12, no. 2 (2021): 154–58. http://dx.doi.org/10.5155/eurjchem.12.2.154-158.2065.

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A one-pot two-component reaction of 3-oxo-2-arylhydrazones with active methylene nitriles under high pressure in a Q-tube safe reactor was reported. Comparison between conventional and Q-tube safe reactor-assisted synthesis of organic compounds was done by comparing total reaction time and percentage yield. The results show that the compound 5-cyano-6-oxo-1,4-diphenyl-1,6-dihydro-pyridazine-3-carboxylic acid ethyl ester (3) was synthesized within 2 h in a yield of 97%. In addition, the pyrazolo[3,4-c]pyridines 5b and 5c were obtained in yields of 93 and 95% within 1 h reaction time, respective

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22

Devika, Neelakandan, Nandhagopal Raja, Subbiah Ananthalakshmi та Bruno Therrien. "Crystal structure of chlorido(2-{[2-(4-chlorophenyl)hydrazin-1-ylidene-κN1](phenyl)methyl}pyridine-κN)(η5-pentamethylcyclopentadienyl)iridium(III) tetraphenylborate". Acta Crystallographica Section E Crystallographic Communications 71, № 3 (2015): m65—m66. http://dx.doi.org/10.1107/s2056989015003023.

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The title compound, [Ir(η5-C5Me5)Cl(C18H14ClN3)]B(C6H5)4, is chiral at the metal center and crystallizes as a racemate. In the cation, the hydrazinylidenepyridine ligand isN,N-coordinated through theN-pyridyl andN-hydrazinylidene groups forming a five-membered metallacycle. An intramolecular C—H...Cl hydrogen bond is observed. In the crystal, centrosymmetrically-related cations are connected by C—Cl...π interactions, forming a dimeric structure. The crystal packing is further stabilized by weak interionic C—H...π interactions.

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23

Shoemaker, James AW, and J. Stephen Hartman. "Chelated fluoroboron cations. I. Synthesis and NMR studies involving the tertiary-amine ligands N,N,N',N'-tetramethylethylenediamine and N,N,N',N",N''-pentamethyldiethylenetriamine." Canadian Journal of Chemistry 77, no. 11 (1999): 1856–68. http://dx.doi.org/10.1139/v99-166.

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Several possible methods of synthesis of chelated fluoroboron cations are explored, using the tert-amines N,N,N',N'-tetramethylethylenediamine (Me4en) and N,N,N',N",N"-pentamethyldiethylenetriamine (Me5dien) as model chelating ligands. Both ligands displace pyridine from (pyr)2BF2+ (as its PF6- salt) to form the bidentate (Me4en)BF2+ and (Me5dien)BF2+ cations. The same cations, as well as the corresponding BFCl+ and BFBr+ cations, can also be prepared by displacement of the donor molecule (D = pyridine or isoxazole) and the heavy halide ion (Cl- or Br-) from the neutral D·BF2X and D·BFX2 adduc

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24

Heard, Peter J., Alex D. Bain, and Paul Hazendonk. "Stereochemical rearrangements in tricarbonylrhenium(I) halide complexes of the nonracemic chiral ligand 2-[(4R,5R)-dimethyl-1,3-dioxan-2-yl]pyridine (L): a dynamic NMR study." Canadian Journal of Chemistry 77, no. 11 (1999): 1707–15. http://dx.doi.org/10.1139/v99-152.

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Tricarbonylrhenium(I) halide complexes of the nonracemic chiral ligand 2-[(4R,5R)-dimethyl-1,3-dioxan-2-yl]pyridine (L), namely fac-[ReX(CO)3L] (X = Cl, Br, or I), have been prepared and their latent fluxionality studied by dynamic NMR techniques in the slow and intermediate exchange regimes. In solution, these complexes give rise to four diastereoisomers, depending on the configuration at the metal and at the acetal-carbon atom, respectively; the relative populations are in the order SR > RR >>; RS > SS. At moderate temperatures, a reversible "acetal ring flip" leads to formal inv

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25

Ohhara, Takashi, Hidehiro Uekusa, Yuji Ohashi, Ichiro Tanaka, Shintaro Kumazawa, and Nobuo Niimura. "Direct observation of deuterium migration in crystalline-state reaction by single-crystal neutron diffraction. III. Photoracemization of 1-cyanoethyl cobaloxime complexes." Acta Crystallographica Section B Structural Science 57, no. 4 (2001): 551–59. http://dx.doi.org/10.1107/s0108768101006838.

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The H atoms bonded to the chiral C atoms (stereogenic center) of the 1-cyanoethyl groups in two cobalt complexes, [(R)-1-cyanoethyl]bis(dimethylglyoximato)(pyridine)cobalt(III) (2) and [(R,S)-1-cyanoethyl]bis(dimethylglyoximato)(piperidine)cobalt(III) (3), were replaced with D atoms, such as Co—C*D(CH3)CN. The crystals of the two cobalt complexes were irradiated with a xenon lamp for 72 h and 27 d, respectively. The unit-cell dimensions were gradually changed with retention of the single-crystal form. The crystal structures after irradiation were determined by neutron diffraction. In each crys

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Wolfe, Saul, Yih-Huang Hsieh, Raymond J. Batchelor, Frederick WB Einstein, and Ian D. Gay. "A topochemical rearrangement with multiple inversions of configuration." Canadian Journal of Chemistry 79, no. 8 (2001): 1272–77. http://dx.doi.org/10.1139/v01-099.

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Crystalline 2-benzyloxypyridine-1-oxide rearranges slowly at room temperature to crystalline 1-benzyloxy-2-pyridone. No intermediates are detected when the process is followed by solid-state 13C NMR. The crystal structure of the pyridine-1-oxide strongly suggests that a topochemically controlled intramolecular process, in which the benzyl group migrates with retention of configuration, is not feasible. On the other hand, although somewhat disfavoured by initial solid-state O···C···O angles significantly less than the ideal 180°, intermolecular topochemically controlled processes can be envisag

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Hernández, Guadalupe, Sylvain Bernès, Oscar Portillo, Alejandro Ruíz, Gloria E. Moreno, and René Gutiérrez. "Crystal structures of three mercury(II) complexes [HgCl2L] whereLis a bidentate chiral imine ligand." Acta Crystallographica Section E Crystallographic Communications 71, no. 12 (2015): 1462–66. http://dx.doi.org/10.1107/s2056989015020368.

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The crystal structures of three complexes [HgCl2L] were determined, namely, (S)-(+)-dichlorido[1-phenyl-N-(pyridin-2-ylmethylidene)ethylamine-κ2N,N′]mercury(II), [HgCl2(C14H14N2)], (S)-(+)-dichlorido[1-(4-methylphenyl)-N-(pyridin-2-ylmethylidene)ethylamine-κ2N,N′]mercury(II), [HgCl2(C15H16N2)], and (1S,2S,3S,5R)-(+)-dichlorido[N-(pyridin-2-ylmethylidene)isopinocampheylamine-κ2N,N′]mercury(II), [HgCl2(C16H22N2)]. The complexes consist of a bidentate chiral imine ligand coordinating to HgCl2and crystallize with four independent molecules in the first complex and two independent molecules in the

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Boyd, Derek R., Narain D. Sharma, Ludmila V. Modyanova, et al. "Dioxygenase-catalyzed cis-dihydroxylation of pyridine-ring systems." Canadian Journal of Chemistry 80, no. 6 (2002): 589–600. http://dx.doi.org/10.1139/v02-062.

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Toluene dioxygenase-catalyzed dihydroxylation, in the carbocyclic rings of quinoline, 2-chloroquinoline, 2-methoxyquinoline, and 3-bromoquinoline, was found to yield the corresponding enantiopure cis-5,6- and -7,8-dihy dro diol metabolites using whole cells of Pseudomonas putida UV4. cis-Dihydroxylation at the 3,4-bond of 2-chloroquino line, 2-methoxyquinoline, and 2-quinolone was also found to yield the heterocyclic cis-dihydrodiol metabolite, (+)-cis-(3S,4S)-3,4-dihydroxy-3,4-dihydro-2-quinolone. Heterocyclic cis-dihydrodiol metabolites, resulting from dihydroxylation at the 5,6- and 3,4-bon

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Sedlák, Miloš, Pavel Drabina, Ivana Císařová, Aleš Růžička, Jiří Hanusek, and Vladimír Macháček. "New chiral ligands and iron(III) complexes based on 2,6-bis(1-benzyl-4-isopropyl-4-methyl-4,5-dihydro-1H-imidazol-5-on-2-yl)pyridines." Tetrahedron Letters 45, no. 41 (2004): 7723–26. http://dx.doi.org/10.1016/j.tetlet.2004.08.085.

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Paronikyan, E. G., G. V. Mirzoyan, A. S. Noravyan, et al. "Synthesis and neurotropic properties of 1-amino-2-substituted 8,9-dihydro-6h-pyrano(thiopyrano)[4,3-d]-thieno-[2,3-b]pyridines and- thieno[2,3-c]-2,7-naphthyridines." Pharmaceutical Chemistry Journal 31, no. 10 (1997): 540–42. http://dx.doi.org/10.1007/bf02464262.

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31

Xu, Jie, and Kou-Lin Zhang. "Preparation, characterization and luminescence-sensing properties of two ZnII MOFs with mixed 5-amino-2,4,6-tribromoisophthalic acid and bipyridyl-type ligands." Acta Crystallographica Section C Structural Chemistry 75, no. 7 (2019): 859–71. http://dx.doi.org/10.1107/s2053229619007435.

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The bromo-substituted aromatic dicarboxylic acid 5-amino-2,4,6-tribromoisophthalic acid (H2ATBIP), in the presence of the N-donor flexible bipyridyl-type ligands 1,3-bis(pyridin-4-yl)propane (bpp) and N,N′-bis(pyridin-4-ylmethyl)oxalamide (4-bpme) and ZnII ions, was used as an O-donor ligand to assemble two novel luminescent metal–organic frameworks (MOFs), namely poly[[(μ-5-amino-2,4,6-tribromoisophthalato-κ2 O 1:O 3)[μ-1,3-bis(pyridin-4-yl)propane-κ2 N:N′]zinc(II)] dimethylformamide monosolvate], {[Zn(C8H2Br3NO4)(C13H14N2)]·C3H7NO} n , (1), and poly[[(μ-5-amino-2,4,6-tribromoisophthalato-κ2

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32

Lee, Dong Won, та Jong Won Shin. "Crystal structure of {(S)-1-phenyl-N,N-bis[(pyridin-2-yl)methyl]ethanamine-κ3N,N′,N′′}bis(thiocyanato-κN)zinc from synchrotron data". Acta Crystallographica Section E Crystallographic Communications 73, № 1 (2017): 17–19. http://dx.doi.org/10.1107/s2056989016019253.

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The title ZnIIcomplex, [Zn(NCS)2(C20H21N3)], has been characterized by synchrotron single-crystal diffraction and FT–IR spectroscopy. The central ZnIIion has a distorted square-pyramidal coordination geometry, with three N atoms of the chiral (S) 1-phenyl-N,N-bis[(pyridin-2-yl)methyl]ethanamine (S-ppme) ligand and one N atom of a thiocyanate anion in the equatorial plane, and one N atom of another thiocyanate anion at the apical position. The average Zn—NS-ppmeand Zn—NNCSbond lengths are 2.183 (2) and 1.986 (2) Å, respectively. In the crystal, intermolecular C—H...S hydrogen bonds and a face-t

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Gvozdev, V. D., K. N. Shavrin, E. G. Baskir, M. P. Egorov, and O. M. Nefedov. "Cyclization of alk-4-ynals with o-diaminoarenes as a selective one-pot synthesis of arylmethylidene-substituted 2,3-dihydro-1H-pyrrolo[1,2-a]benzimidazoles and 7,8-dihydro-6H-pyrrolo[1’,2’:1,2]imidazo[4,5-b]pyridines." Russian Chemical Bulletin 65, no. 7 (2016): 1829–38. http://dx.doi.org/10.1007/s11172-016-1517-6.

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34

PARONIKYAN, E. G., G. V. MIRZOYAN, A. S. NORAVYAN, et al. "ChemInform Abstract: Synthesis and Neurotropic Properties of 1-Amino-2-substituted-8,9-dihydro-6H-pyrano(thiopyrano)[4,3-d]thieno [2,3-b]pyridines and -thieno[2,3-c][2,7]naphthyridines." ChemInform 29, no. 11 (2010): no. http://dx.doi.org/10.1002/chin.199811163.

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35

Ryzhkov, Fedor V., Michail N. Elinson, Yuliya E. Ryzhkova, Anatoly N. Vereshchagin, Alexander S. Goloveshkin, and Mikhail P. Egorov. "Stereoselective domino assembling of five molecules: one-pot approach to $(2^{\prime }R,3S,4^{\prime }R)$-$2^{\prime },4^{\prime }$-diaryl-$1^{\prime },4^{\prime }$-dihydro-$2^{\prime }H $-spiro[indoline-$3,3^{\prime }$-pyridines]." Comptes Rendus. Chimie 23, no. 2 (2020): 159–68. http://dx.doi.org/10.5802/crchim.13.

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Akotsi, Okwado M., Robert McDonald, and Steven H. Bergens. "Synthesis of a PennPhosruthenium(II) complex: The first crystal structure of a PennPhos-metal complex." Canadian Journal of Chemistry 80, no. 11 (2002): 1555–61. http://dx.doi.org/10.1139/v02-151.

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The chiral bis(phosphine) ligand P,P'-1,2-phenylenebis[(1R,2S,4R,5S)-2,5-dimethyl-7-phosphabicyclo [2.2.1]heptane], [(R,S,R,S)-Me-PennPhos] (1) reacts with trans-RuCl2(NBD)Py2 (NBD = norbornadiene, Py = pyridine) (2) in CH2Cl2 at 45°C to form two diastereomers of the triply chloride bridged cation [{(1)RuPy}2(µ-Cl)3)][Cl] (3) in the ratio 1:3. The isomers were studied by NMR spectroscopy and separated by crystallization from CD2Cl2hexanes mixture. The major diastereomer is one of the anti-diastereomers and contains face-sharing bioctahedral diruthenium (Ru(II, II)) molecules with a RuRu dis

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Tolkunov, V. S., A. B. Eres’ko, A. I. Khizhan, et al. "Domino reactions in the synthesis of benzothieno[2,3-c]pyridines. New one-pot method of preparing 2-([1]benzothieno-[2,3-c]pyridin-1-yl)benzoic acids and 8,13b-dihydro[1]benzothieno[2',3':3,4]pyrido-[2,1-a]isoindol-5(7 H)-ones." Chemistry of Heterocyclic Compounds 48, no. 4 (2012): 666–71. http://dx.doi.org/10.1007/s10593-012-1041-z.

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Takayama, Tomoaki, Jun Nakazawa, and Shiro Hikichi. "A pseudotetrahedral nickel(II) complex with a tridentate oxazoline-based scorpionate ligand: chlorido[tris(4,4-dimethyloxazolin-2-yl)phenylborato]nickel(II)." Acta Crystallographica Section C Structural Chemistry 72, no. 11 (2016): 842–45. http://dx.doi.org/10.1107/s2053229616012183.

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Poly(pyrazol-1-yl)borates have been utilized extensively in coordination compounds due to their high affinity toward cationic metal ions on the basis of electrostatic interactions derived from the mononegatively charged boron centre. The original poly(pyrazol-1-yl)borates, christened `scorpionates', were pioneered by the late Professor Swiatoslaw Trofimenko and have expanded to include various borate ligands with N-, P-, O-, S-, Se- and C-donors. Scorpionate ligands with boron–carbon bonds, rather than the normal boron–nitrogen bonds, have been developed and in these new types of scorpionate l

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Šámal, Michal, Jiří Míšek, Irena G. Stará, and Ivo Starý. "Organocatalysis with azahelicenes: the first use of helically chiral pyridine-based catalysts in the asymmetric acyl transfer reaction." Collection of Czechoslovak Chemical Communications 74, no. 7-8 (2009): 1151–59. http://dx.doi.org/10.1135/cccc2009067.

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The successful utilisation of a helicene-based organocatalyst in acylative kinetic resolution of racemic secondary alcohol was described. Employing rac-1-phenylethanol, optically pure (–)-(M)-2-aza[6]helicene (5–20 mole %), isobutyric anhydride and N-ethyldiisopropylamine in chloroform at 22–40 °C, an asymmetric acyl transfer reaction took place overwhelming the uncatalysed background process. Moderate reactivity as well as selectivity factor (s = 9, 10) were observed. An effective control of the enantiodiscriminating step in acylative kinetic resolution by the helically chiral organocatalyst

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Tolkunov, V. S., A. B. Eres'ko, A. I. Khizhan, et al. "ChemInform Abstract: Domino Reactions in the Synthesis of Benzothieno[2,3-c]pyridines. New One-Pot Method of Preparing 2-([1]Benzothieno[2,3-c]pyridin-1-yl)benzoic Acids (IV) and 8,13b-Dihydro[1]benzothieno[2′,3′:3,4]pyrido[2,1-a]isoindol-5(7H)-ones (V)." ChemInform 43, no. 51 (2012): no. http://dx.doi.org/10.1002/chin.201251130.

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41

Bradberry, Samuel J., Aramballi Jayant Savyasachi, Robert D. Peacock, and Thorfinnur Gunnlaugsson. "Quantifying the formation of chiral luminescent lanthanide assemblies in an aqueous medium through chiroptical spectroscopy and generation of luminescent hydrogels." Faraday Discussions 185 (2015): 413–31. http://dx.doi.org/10.1039/c5fd00105f.

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Herein we present the synthesis and the photophysical evaluation of water-soluble chiral ligands (2·(R,R) and 2·(S,S)) and their application in the formation of lanthanide directed self-assembled structures. These pyridine-2,6-dicarboxylic amide based ligands, possessing two naphthalene moieties as sensitising antennae, that can be used to populate the excited state of lanthanide ions, were structurally modified using 3-propanesultone and caesium carbonate, allowing for the incorporation of a water-solubilising sulfonate motif. We show, using microwave synthesis, that Eu(iii) forms chiral comp

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Jiao, Lei, and Fei-Yu Zhou. "Recent Developments in Transition-Metal-Free Functionalization and Derivatization Reactions of Pyridines." Synlett, October 28, 2020. http://dx.doi.org/10.1055/s-0040-1706552.

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AbstractPyridine is an important structural motif that is prevalent in natural products, drugs, and materials. Methods that functionalize and derivatize pyridines have gained significant attention. Recently, a large number of transition-metal-free reactions have been developed. In this review, we provide a brief summary of recent advances in transition-metal-free functionalization and derivatization reactions of pyridines, categorized according to their reaction modes.1 Introduction2 Metalated Pyridines as Nucleophiles2.1 Deprotonation2.2 Halogen–Metal exchange3 Activated Pyridines as Electrop

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Keder, R., P. Drabina, J. Hanusek, and M. Sedlák. "New substituted mono-and bis(imidazolyl)pyridines and their application in nitroaldolisation reaction." Chemical Papers 60, no. 4 (2006). http://dx.doi.org/10.2478/s11696-006-0059-z.

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AbstractNew chiral nitrogen ligands based on the substituted mono-and bis(imidazolyl)pyridines have been prepared and characterised. Their complexes with cupric acetate were used as catalysts in the nitroaldolisation reaction. In the case of optically pure complexes of mono(imidazolyl)pyridine, the isolated products were 2-nitro-1-(2-nitrophenyl)ethanols or 2-nitro-1-(4-nitrophenyl)ethanols in overall yields of 49–93 % and with the maximum enantiomeric excess of 15.6 %. The complexes of bis(imidazolyl)pyridine also catalyse the nitroaldol reaction, the yields being 64–90 %, but with zero enant

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Jagath Reddy, G., D. Latha, C. Thirupathaiah, and K. Srinivasa Rao. "SYNTHESIS OF 7-(CHROMON-3-YL)-6a,7-DIHYDRO-6H[1]- BENZOPYRANO[3,4-c][1,5]BENZOTHIAZEPINES AND 2-ARYL-4- (CHROMON-3-YL)BENZOPYRANO[4,3-b]PYRIDINES." Heterocyclic Communications 9, no. 6 (2003). http://dx.doi.org/10.1515/hc.2003.9.6.567.

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