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Journal articles on the topic '5-a]pyridine'

Author: Grafiati

Published: 4 June 2021

Last updated: 13 February 2022

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1

Yao, Jin-hua, Lan-fang Wang, Bing Guo, Kang An, and Jian-ning Guan. "Ethyl 5-methylimidazo[1,2-a]pyridine-2-carboxylate." Acta Crystallographica Section E Structure Reports Online 66, no. 8 (2010): o1999. http://dx.doi.org/10.1107/s1600536810026577.

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2

Macor, John E., Ronald Post, and Kevin Ryan. "A synthesis of 5-carboxamidopyrrolo[3,2-b]pyridine." Journal of Heterocyclic Chemistry 29, no. 6 (1992): 1465–67. http://dx.doi.org/10.1002/jhet.5570290616.

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3

Ronen, Zeev, and Jean-Marc Bollag. "Pyridine metabolism by a denitrifying bacterium." Canadian Journal of Microbiology 37, no. 10 (1991): 725–29. http://dx.doi.org/10.1139/m91-125.

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A denitrifying bacterium capable of pyridine degradation was isolated from contaminated soil. The Gram-negative bacterium, which was identified as an Alcaligenes sp., rapidly metabolized pyridine under anaerobic conditions with nitrate as electron acceptor. [14C]Pyridine was converted to 14CO2, unidentified polar metabolic products, and labeled biomass. During pyridine metabolism, nitrate was reduced to nitrogen gas via nitrite and nitrous oxide. The molar ratio of pyridine to nitrate strongly affected pyridine metabolism. Maximum pyridine degradation occurred at a nitrate concentration above

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4

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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5

Yamano, Kimiaki, and Haruhisa Shirahama. "Clitidine 5′-mononucleotide, a toxic pyridine nucleotide from Clitocybe acromelalga." Phytochemistry 35, no. 4 (1994): 897–99. http://dx.doi.org/10.1016/s0031-9422(00)90634-4.

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6

Podhorez, David E. "Stepwise approach to the 2,3-dihydroimidazo[1,2-a]pyridine and 5-oxo-1,2,3,5-tetrahydroimidazo[1,2-a]pyridine ring systems." Journal of Heterocyclic Chemistry 28, no. 4 (1991): 971–76. http://dx.doi.org/10.1002/jhet.5570280422.

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7

Channapur, Manjunath, Roger Hall, Jilali Kessabi, Mark Montgomery, and Ashok Shyadligeri. "Synthesis of 6-Chloro-5-(trifluoroacetyl)pyridine-3-carbonitrile: A Novel, Versatile Intermediate for the Synthesis of Trifluoromethylated Azaindazole Derivatives." Synlett 30, no. 09 (2019): 1057–60. http://dx.doi.org/10.1055/s-0037-1611815.

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A synthesis of 6-chloro-5-(trifluoroacetyl)pyridine-3-carbonitrile, a versatile building block for the synthesis of trifluoromethylated N-heterocycles, is described. The reactions of 6-chloro-5-(trifluoroacetyl)pyridine-3-carbonitrile with 1,2- and 1,3-bisnucleophiles were investigated.

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8

Barraclough, Paul, Ramachandran Iyer, John C. Lindon, and Janet M. Williams. "An adventitious synthesis of a 5-methylimidazo[4,5-c]pyridine derivative." Tetrahedron Letters 27, no. 49 (1986): 5997–6000. http://dx.doi.org/10.1016/s0040-4039(00)85382-4.

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9

Jia, Jiong, Yan-qing Ge, Gui-long Zhao, and Jian-wu Wang. "Ethyl 6-methyl-2-p-tolylpyrazolo[1,5-a]pyridine-5-carboxylate." Acta Crystallographica Section E Structure Reports Online 65, no. 10 (2009): o2372. http://dx.doi.org/10.1107/s1600536809035314.

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10

Zhou, Dongheng, Yufei Tian, and Yongmin Ma. "Preparation of 5-Functionalised Pyridine Derivatives using a Br/Mg Exchange Reaction: Application to the Synthesis of an Iron-Chelator Prodrug." Journal of Chemical Research 41, no. 11 (2017): 627–30. http://dx.doi.org/10.3184/174751917x15094552081134.

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A novel preparation of 5-functionalised pyridine derivatives is reported from 5-bromo-4-tosyloxypyridines via a Br/Mg exchange procedure with i-PrMgCl·LiCl, followed by addition of an electrophile. The reaction was carried out under mild conditions and gave good to high yields. The resulting 5-functionalised pyridine derivatives enrich the library of pyridinone-type iron-chelator prodrugs.

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11

Meng, Qing-Yang, Jiong Jia, Ling Yin, Fu-Xu Zhan, and Jian-Wu Wang. "Ethyl 3-{5-[(diethylamino)methyl]isoxazol-3-yl}-2-phenylpyrazolo[1,5-a]pyridine-5-carboxylate." Acta Crystallographica Section E Structure Reports Online 66, no. 4 (2010): o723. http://dx.doi.org/10.1107/s1600536810004174.

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12

Guo, Jianyu, Yan Lu, and Jin Wang. "Efficient synthesis of 3-(bromomethyl)-5-methylpyridine hydrobromide." Heterocyclic Communications 21, no. 4 (2015): 203–5. http://dx.doi.org/10.1515/hc-2015-0107.

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Abstract5-Methyl-3-(bromomethyl)pyridine is the key intermediate in the synthesis of rupatadine. In this article, a new preparation of 5-methyl-3-(bromomethyl)pyridine hydrobromide is reported, which used 5-methylnicotinic acid as the starting material, with a 65.9% overall yield. This method has the merits of being simple, efficient and environmentally friendly.

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13

Ambrosetti, Roberto, Rocco Angelone, and Juan Murgich. "A 14N FT-NQR Investigation on Solid Pyridine and Pyridine-D5." Zeitschrift für Naturforschung A 41, no. 1-2 (1986): 299–304. http://dx.doi.org/10.1515/zna-1986-1-255.

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The FT-NQR spectra of 14N in both pyridine and pyridine-D 5 show four sets of resonance lines at - 196 °C, which disappear reversibly at - 191.5 °C and - 187 °C, respectively. This is interpreted as a phase transition, possibly of the order-disorder type. The NQR results can thus be reconciled with X-ray measurements at - 180 °C which suggested a single site for pyridine. The similarity of the NQR spectra of different samples of both compounds, frozen and cooled with widely different procedures, suggests that the high multiplicity of the NQR spectra is not the result of coexistence of differen

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14

Hernández, Wilfredo, Fernando Carrasco, Abraham Vaisberg, et al. "Synthesis, Spectroscopic Characterization, Structural Studies, and In Vitro Antitumor Activities of Pyridine-3-carbaldehyde Thiosemicarbazone Derivatives." Journal of Chemistry 2020 (September 14, 2020): 1–12. http://dx.doi.org/10.1155/2020/2960165.

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Eight new thiosemicarbazone derivatives, 6-(1-trifluoroethoxy)pyridine-3-carbaldehyde thiosemicarbazone (1), 6-(4′-fluorophenyl)pyridine-3-carbaldehyde thiosemicarbazone (2), 5-chloro-pyridine-3-carbaldehyde thiosemicarbazone (3), 2-chloro-5-bromo-pyridine-3-carbaldehyde thiosemicarbazone (4), 6-(3′,4′-dimethoxyphenyl)pyridine-3-carbaldehyde thiosemicarbazone (5), 2-chloro-5-fluor-pyridine-3-carbaldehyde thiosemicarbazone, (6), 5-iodo-pyridine-3-carbaldehyde thiosemicarbazone (7), and 6-(3′,5′-dichlorophenyl)pyridine-3-carbaldehyde thiosemicarbazone (8) were synthesized, from the reaction of t

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15

Lin, Nan-Horng, Yihong Li, Yun He, et al. "Synthesis and structure–activity relationships of 5-substituted pyridine analogues of 3-[2-((S)-pyrrolidinyl)methoxy]pyridine, A-84543." Bioorganic & Medicinal Chemistry Letters 11, no. 5 (2001): 631–33. http://dx.doi.org/10.1016/s0960-894x(01)00030-0.

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16

Aghabozorg, Hossein, Mohammad Ghadermazi, and Farshid Ramezanipour. "A proton transfer compound: propane-1,3-diaminium–pyridine-2,6-dicarboxylate–pyridine-2,6-dicarboxylic acid–water (2/2/2/5)." Acta Crystallographica Section E Structure Reports Online 62, no. 3 (2006): o1143—o1146. http://dx.doi.org/10.1107/s1600536806005393.

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17

Shukla, Onkar P., and Shanti M. Kaul. "Microbiological transformation of pyridine N-oxide and pyridine by Nocardia sp." Canadian Journal of Microbiology 32, no. 4 (1986): 330–41. http://dx.doi.org/10.1139/m86-065.

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A Nocardia sp., which utilises pyridine N-oxide (PNO), 2-hydroxypyridine, and pyridine as sole sources of carbon, nitrogen, and energy, has been isolated from soil by enrichment on PNO. PNO-adapted cells rapidly oxidized PNO and 2-hydroxypyridine; pyridine was oxidized very slowly. 2-Hydroxy pyridine- and pyridine-adapted cells oxidized their respective substrates, but PNO was not oxidized. Dihydroxypyridines did not accumulate during growth of the organism, but the formation of blue pigments during fermentation of PNO and 2-hydroxypyridine suggested their transient participation. The pigment

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18

Ghozlan, Said A. S., Doaa M. Abdelmoniem, Hamdi M. Hassaneen, Amr M. Abdelmoniem, and Ismail A. Abdelhamid. "Cyclic Enaminone Incorporating 5-cyanomethylpyrazole-4-carbonitrile: Unexpected Formation of Pyrazolo[l,5-a]pyridine Derivatives." Journal of Heterocyclic Chemistry 55, no. 7 (2018): 1798–803. http://dx.doi.org/10.1002/jhet.3220.

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19

Choi, Woo-Baeg, Ioannis N. Houpis, Hywyn R. O. Churchill, et al. "A practical synthesis of the 5-chloromethyl-furo[2,3-b]pyridine pharmacophore." Tetrahedron Letters 36, no. 26 (1995): 4571–74. http://dx.doi.org/10.1016/0040-4039(95)00850-c.

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20

Abramovic, Biljana, Vesna Anderluh, Andjelka Topalov, and Ferenc Gaal. "Kinetics of photocatalytic removal of 2-amino-5-chloropyridine from water." Acta Periodica Technologica, no. 35 (2004): 79–86. http://dx.doi.org/10.2298/apt0435079a.

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Titanium dioxide sensitized photocatalytic degradation of a pyridine pesticide analogue, 2-amino-5-chloropyridine, was investigated by monitoring the pyridine moiety degradation, as well as by monitoring the chloride generated in the process. Effect of the initial substrate concentration on the rate of its degradation is reported. Here we show that the kinetics of both reactions are of the zero-order in the entire investigated concentration range. The Langmuir-Hinshelwood kinetic model successfully described the influence of the initial substrate concentration on the rate of the pyridine moiet

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21

Körte, Leif A., Robin Warner, Yury V. Vishnevskiy, Beate Neumann, Hans-Georg Stammler, and Norbert W. Mitzel. "Intramolecular pyridine-based frustrated Lewis-pairs." Dalton Transactions 44, no. 21 (2015): 9992–10002. http://dx.doi.org/10.1039/c5dt01068c.

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Besides a series of pyridine-based Lewis pairs with B(C<sub>6</sub>F<sub>5</sub>)<sub>2</sub> groups with varying electronic and steric situations and strong intramolecular B–N bonds, 2-[(CH<sub>2</sub>)<sub>4</sub>B(C<sub>6</sub>F<sub>5</sub>)<sub>2</sub>]-6-tBu-pyridine was found to behave as a frustrated Lewis pair.

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22

PODHOREZ, D. E. "ChemInform Abstract: Stepwise Approach to the 2,3-Dihydroimidazo(1,2-a)pyridine and 5-Oxo-1, 2,3,5-tetrahydroimidazo(1,2-a)pyridine Ring Systems." ChemInform 22, no. 47 (2010): no. http://dx.doi.org/10.1002/chin.199147168.

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23

Abramovic, Biljana, Vesna Anderluh, Andjelka Topalov, and Ferenc Gaal. "Direct photolysis and photocatalytic degradation of 2-amino-5-chloropyridine." Journal of the Serbian Chemical Society 68, no. 12 (2003): 961–70. http://dx.doi.org/10.2298/jsc0312961a.

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The direct photolysis and photocatalytic degradation of a pyridine pesticide analogue, 2-amino-5-chloropyridine, were investigated employing different analytical techniques ? potentiometry, for monitoring the pH and chloride genera- tion, spectrophotometry, for studying the degradation of the pyridine moiety, ion chromatography, for monitoring nitrate formation, and total organic carbon analysis for investigating the efficiency of the process. The photocatalytic degradation was studied in aqueous suspensions of titanium dioxide under illumination by UV light. It was found that chloride evoluti

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24

Sugiyarto, KH, DC Craig, AD Rae, and HA Goodwin. "Structural and Electronic Properties of Iron(II) and Nickel(II) Complexes of 2,6-Bis(triazol-3-yl)pyridines." Australian Journal of Chemistry 46, no. 8 (1993): 1269. http://dx.doi.org/10.1071/ch9931269.

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Iron(II) and nickel(II) bis ( ligand ) complexes of 2,6-bis(1,2,4-triazol-3-yl)pyridine and the substituted derivatives 2,6-bis(1(N)-methyl-1,2,4-triazol-3-yl)pyridine 2,6-bis(5-methyl-1,2,4-triazol-3-yl)pyridine and 2,6-bis(1,5-dimethyl-1,2,4-triazol-3-yl)pyridine have been prepared. Coordination of the unsubstituted ligand through N4 of the triazolyl moieties is confirmed by structure determination of [FeL2][NO3]2.4H2O and [NiL2]Cl2.3H2O. In both of these complex salts there is an extensive hydrogen-bonded network involving the N 1-H group, the anions and the water molecules. Bis [2,6-bis(1,

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25

Natansohn, Almeria, and Adi Eisenberg. "Nuclear magnetic resonance studies of ionomers. 5. Spectra of poly (methyl methacrylate-co-4-vinyl pyridine), poly (methyl methacrylate-co-2-methyl-5-vinyl pyridine), and their quaternized derivatives." Canadian Journal of Chemistry 65, no. 8 (1987): 1873–81. http://dx.doi.org/10.1139/v87-314.

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Proton and carbon nuclear magnetic resonance spectra in solution of poly (methyl methacrylate-co-4-vinyl pyridine), poly(methyl methacrylate-co-2-methyl-5-vinyl pyridine), and of their derivatives obtained by quaternization with methyl iodide are presented. The vinyl pyridine structural units content of the samples is ca. 10%. In different solvents, the spectra provide information about the sequence distribution and configuration of the copolymers. A "coisotactic" alternating addition, defined as the probability of finding a methoxy group and a pyridine ring neighboring each other on the same

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26

Hückstädt, Heiner, and Heiner Homborg. "Synthese von Bis[pyridin-phthalocyaninato(1,5-)iridium(II)]iodid und Pyridin-iodo-phthalocyaninato(2-)iridium(III)-Pyridin durch schrittweise Oxydation von Bis[pyridin-phthalocyaninato(2-)iridium(II)]/Synthesis of Bis[pyridine-phthalocyaninato(1,5-)iridium(II)] Iodide and Pyridine-iodo-phthalocyaninato(2-)iridium(III)-Pyridine by Successive Oxidation of Bis[pyridine-phthalocyaninato(2-)iridium(II)]." Zeitschrift für Naturforschung B 52, no. 6 (1997): 728–34. http://dx.doi.org/10.1515/znb-1997-0610.

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Abstract Successive oxidation of bis[pyridine-phthalocyaninato(2-)iridium(II)] with iodine first yields mixed-valent bis[pyridine-phthalocyaninato(1,5-)iridium(II)] iodide ([(Ir(py)pc1.5-}2]I) and then pyridine-iodo-phthalocyaninato(2-)iridium(III)-pyridine ([Ir(py)(I)pc2-]·py). The latter crystallizes monoclinically with the following cell parameters: a = 10.258(1) Å, b = 17.589(3) Å, c = 19.723(2) Å, β = 92.95(1)°, space group P21/n, Z = 4. IrIII is in the centre of a slightly distorted pc2- ligand and coordinates pyridine and iodide in a trans-arrangement. The average Ir-Niso distance is 1.

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27

Bastrakov, Maxim A., Alexey K. Fedorenko, Alexey M. Starosotnikov та Alexander Kh Shakhnes. "Nitropyridines as 2π-Partners in 1,3-Dipolar Cycloadditions with N-Methyl Azomethine Ylide: An Easy Access to Condensed Pyrrolines". Molecules 26, № 18 (2021): 5547. http://dx.doi.org/10.3390/molecules26185547.

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1,3-Dipolar cycloaddition reactions of 2-substituted 5-R-3-nitropyridines and isomeric 3-R-5-nitropyridines with N-methyl azomethine ylide were studied. The effect of the substituent at positions 2 and 5 of the pyridine ring on the possibility of the [3+2]-cycloaddition process was revealed. A number of new derivatives of pyrroline and pyrrolidine condensed with a pyridine ring were synthesized.

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28

Wu, Xiang-Wen, Meng-Meng Xin, Jian-Ping Ma, Zhen-Hua Wu, and Yu-Bin Dong. "The coordination chemistry of two symmetric double-armed oxadiazole-bridged organic ligands with copper salts." Acta Crystallographica Section C Crystal Structure Communications 69, no. 6 (2013): 601–5. http://dx.doi.org/10.1107/s0108270113010913.

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Two new symmetric double-armed oxadiazole-bridged ligands, 4-methyl-{5-[5-methyl-2-(pyridin-3-ylcarbonyloxy)phenyl]-1,3,4-oxadiazol-2-yl}phenyl pyridine-3-carboxylate (L1) and 4-methyl-{5-[5-methyl-2-(pyridin-4-ylcarbonyloxy)phenyl]-1,3,4-oxadiazol-2-yl}phenyl pyridine-4-carboxylate (L2), were prepared by the reaction of 2,5-bis(2-hydroxy-5-methylphenyl)-1,3,4-oxadiazole with nicotinoyl chloride and isonicotinoyl chloride, respectively. LigandL1 can be used as an organic clip to bind CuIIcations and generate a molecular complex, bis(4-methyl-{5-[5-methyl-2-(pyridin-3-ylcarbonyloxy)phenyl]-1,3,

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29

Vázquez, M. A., F. Muñoz, J. Donoso, and F. García Blanco. "Spectroscopic study of the Schiff bases of dodecylamine with pyridoxal 5′-phosphate and 5′-deoxypyridoxal. A model for the Schiff bases of pyridoxal 5′-phosphate in biological systems." Biochemical Journal 279, no. 3 (1991): 759–67. http://dx.doi.org/10.1042/bj2790759.

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We recorded the absorption spectra of the Schiff bases of pyridoxal 5′-phosphate (PLP) and 5′-deoxypyridoxal (DPL) with dodecylamine (DOD) at different pH values. By applying deconvolution techniques to the spectra and analysing their different components we found that the above-mentioned Schiff bases in aqueous solutions of pH 7 adopted a conformation in which the pyridine ring is embedded in a very hydrophobic medium from which water is virtually completely excluded. This conformation in the same as that adopted by PLP when it acts as coenzyme for some enzymes such as glycogen phosphorylase.

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30

Fun, Hoong-Kun, Suhana Arshad, P. C. Shyma, Balakrishna Kalluraya, and T. Arulmoli. "1-[2-(4-Chlorophenyl)-5-phenyl-2,3-dihydro-1,3,4-oxadiazol-3-yl]ethanone." Acta Crystallographica Section E Structure Reports Online 68, no. 6 (2012): o1901. http://dx.doi.org/10.1107/s1600536812023100.

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In the title compound, C16H14ClN3O2, the 2,3-dihydro-1,3,4-oxadiazole ring [maximum deviation = 0.030 (1) Å] and the pyridine ring [maximum deviation = 0.012 (1) Å] are inclined slightly to one another, making a dihedral angle of 11.91 (5)°. The chloro-substituted phenyl ring is almost perpendicular to the 2,3-dihydro-1,3,4-oxadiazole and pyridine rings at dihedral angles of 86.86 (5) and 75.26 (5)°, respectively. In the crystal, π–π [centroid–centroid distance = 3.7311 (6) Å] and C—H...π interactions are observed.

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31

Zhang, Yuecheng, Xiang Yan, Baoqiang Niu, and Jiquan Zhao. "A study on the conversion of glycerol to pyridine bases over Cu/HZSM-5 catalysts." Green Chemistry 18, no. 10 (2016): 3139–51. http://dx.doi.org/10.1039/c6gc00038j.

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32

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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33

Bisagni, Emile, Marilys Rautureau, Martine Croisy-Delcey, and Christiane Huel. "Nouvelle synthèse de chloro-1 méthyl-5 isoquinoléines fusionnées à divers systèmes aromatiques par leur liaison [g]." Canadian Journal of Chemistry 65, no. 9 (1987): 2027–30. http://dx.doi.org/10.1139/v87-337.

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Lithiation of 4-acetyl 2-chloro pyridine ethylene glycol ketal by exchange with lithium diisopropylamine (LDA) led to 4-acetyl 2-chloro 3-lithio pyridine ethylene glycol ketal. This lithio derivative was reacted with aromatic aldehydes giving the expected alcohols, which were reduced by triethylsilane and trifluoroacetic acid at room temperature. The resulting 4-acetyl 3-arylmethyl 2-chloro pyridine ethylene glycol ketals were hydrolysed and cyclized in acidic medium, leading to polycondensed heterocyclic systems that have a 1-chloro 5-methyl isoquinoline nucleus fused by its [g] bond to the s

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34

Yokozawa, Tsutomu, Yutaka Nanashima, Haruhiko Kohno, Ryosuke Suzuki, Masataka Nojima та Yoshihiro Ohta. "Catalyst-transfer condensation polymerization for precision synthesis of π-conjugated polymers". Pure and Applied Chemistry 85, № 3 (2012): 573–87. http://dx.doi.org/10.1351/pac-con-12-03-13.

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Catalyst-transfer condensation polymerization, in which the catalyst activates the polymer end-group, followed by reaction with the monomer and transfer of the catalyst to the elongated polymer end-group, has made it feasible to control the molecular weight, polydispersity, and end-groups of π-conjugated polymers. In this paper, our recent progress of Kumada–Tamao Ni catalyst-transfer coupling polymerization and Suzuki–Miyaura Pd catalyst-transfer coupling polymerization is described. In the former polymerization method, the polymerization of Grignard pyridine monomers was investigated for the

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35

Malottki, B. v., and W. Preetz. "Darstellung und Kristallstruktur von (n-Bu4N)[ReBr5Py] / Synthesis and Crystal Structure of (n-Bu4N)[ReBr5Py]." Zeitschrift für Naturforschung B 55, no. 6 (2000): 484–86. http://dx.doi.org/10.1515/znb-2000-0607.

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By reaction of (n-Bu4N)2[ReBr6] with pyridine and (n-Bu4N)BH4 in dichloromethane various bromo-pyridine-rhenium(III) complexes are formed which can be separated by chromatography. Electrochemical oxidation of (n-Bu4N)2[ReBr5Py] leads to (n-Bu4N)[ReBr5Py]. X-ray structure determination on a single crystal has been performed of (n-Bu4N)[ReBr5Py] (monoclinic, space group P21/n a = 11,248(5), b = 17,192(5), c = 15,206(5) Å, β = 97,600(5)°, Z = 4).

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36

Bagdi, Prasanta Ray, R. Sidick Basha, and Abu T. Khan. "Synthesis of 2-triazolyl-imidazo[1,2-a]pyridine through a one-pot three-component reaction using a nano copper oxide assisted click-catalyst." RSC Advances 5, no. 75 (2015): 61337–44. http://dx.doi.org/10.1039/c5ra09671e.

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The syntheses of 2-triazolyl imidazo[1,2-a]pyridine were accomplished through 5-exo dig cyclisation using 5 mol% nanocopper oxide together with 10 mol% sodium ascorbate as a click-catalyst in ethanol at 70 °C.

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37

Roa, Luis-Fernando, Dino Gnecco, Alberto Galindo, Jorge Juárez, Joel L. Terán, and Sylvain Bernès. "trans-(3R,2aS)-(−)-3-Phenyl-2,3,5,6,7,8-hexahydro-oxazolo[3,2-a]pyridine-5-thione." Acta Crystallographica Section E Structure Reports Online 59, no. 4 (2003): o519—o521. http://dx.doi.org/10.1107/s1600536803004720.

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38

Singh, N. K., Ray J. Butcher, Manoj Kumar Bharty, Ajay K. Srivastava, and Pratibha Tripathi. "4-[5-(Benzylsulfanyl)-1,3,4-oxadiazol-2-yl]pyridine from a single-pot reaction." Acta Crystallographica Section E Structure Reports Online 62, no. 8 (2006): o3473—o3474. http://dx.doi.org/10.1107/s1600536806027814.

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39

Lejeune, R., J. L. Vandenbalck, G. J. Patriarche, and C. L. Lapière. "Contribution a L'étude électrochimique de dérivés de L'acide mercapto-2 pyridine carboxylique-5." Bulletin des Sociétés Chimiques Belges 90, no. 7 (2010): 663–74. http://dx.doi.org/10.1002/bscb.19810900703.

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40

Lejeune, R., J. L. Vandenbalck, G. J. Patriarche, and C. L. Lapière. "Contribution a L'Étude Électrochimique de Dérivés de L'Acide Mercapto-2 Pyridine Carboxylique-5." Bulletin des Sociétés Chimiques Belges 90, no. 9 (2010): 881–91. http://dx.doi.org/10.1002/bscb.19810900902.

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41

Ravi, Chitrakar, Arem Qayum, Darapaneni Chandra Mohan, Shashank K. Singh, and Subbarayappa Adimurthy. "Design, synthesis and cytotoxicity studies of novel pyrazolo[1, 5-a]pyridine derivatives." European Journal of Medicinal Chemistry 126 (January 2017): 277–85. http://dx.doi.org/10.1016/j.ejmech.2016.11.037.

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42

Eichinger, Karl, Christoph Brunmair, and Martin Bucher. "3,10,17,24-Tetra(1-methylethyl)-[29H,31H-tetrapyrido[2,3-b:2′,3′-g:2″-3″-I:2‴,3‴ -q]porphyrazinato-(2-)N29,N30,N31,N32]-nickel- [Eu(fod)3]4- Ein lösliches Pyridoporphyrazin / 3,10,17,24-Tetra(1-methylethyl)- [29H,31H-tetrapyrido[2,3-b:2′,3′-g:2″-3″-I:2‴,3‴-q]porphyrazinato-(2-)N29,N30,N31,N32]-nickel-[Eu(fod)3]4 - A Soluble Pyridoporphyrazine." Zeitschrift für Naturforschung B 53, no. 5-6 (1998): 637. http://dx.doi.org/10.1515/znb-1998-5-624.

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Abstract Starting from diethyl 5-(methylethyl)pyridine- 2,3-dicarboxylate the crystalline and highly soluble complex 3,10,17,24-Tetra(1-methylethyl)- [29H,31H-tetrapyrido[2,3-b:2′, 3′, -g:2″-3″-I:2‴, 3‴-q]porphyrazinato(2-)N29,N30,N31 ,N32]- nickel-[Eu(fod)3]4 was prepared. In this compound each europium ligand is coordinated to a pyridine N-atom and neighboured N-atom of the porphyrazine ring.

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43

Kostenko, Nataliya, Jochen Gottfriedsen, Liane Hilfert, and Frank T. Edelmann. "A Synthetic Route to Quaternary Pyridinium Salt-Functionalized Silsesquioxanes." International Journal of Polymer Science 2012 (2012): 1–9. http://dx.doi.org/10.1155/2012/586594.

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A synthetic route to potentially biocidal silsesquioxanes functionalized by quaternary pyridinium functionalities has been developed.N-Alkylation reactions of the precursor compounds 4-(2-(trimethoxysilyl)ethyl)-pyridine (5) and 4-(2-trichloro-silylethyl)pyridine (6) with iodomethane,n-hexylbromide, andn-hexadecylbromide cleanly afforded the correspondingN-alkylpyridinium salts (7–10). The synthesis of a 4-(2-ethyl)pyridine POSS derivative (2) was achieved by capping of the silsesquioxane trisilanol Cy7Si7O9(OH)3(1) via two different preparative routes. Attempts to use compound2as precursor fo

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44

Goher, M. A. S., M. A. M. Abu-Youssef, F. A. Mautner та H. P. Fritzer. "Crystal Structure Investigation of Two Polymeric Chromium(III) Azide Complexes; KCr(pyridine)4(N3)4 and RbCr(pyridine)3(N3)4. A Structure Containing μ(l,3) and μ(1,1,3) Bridging Azido Ligands between Chromium and Rubidium Centered Polyhedra". Zeitschrift für Naturforschung B 47, № 12 (1992): 1754–58. http://dx.doi.org/10.1515/znb-1992-1219.

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The structures of two polymeric complexes of chromium(III) azide with pyridine, KCr(py)4(N3)4 (1), and RbCr(py)3(N3)4 (2), were determined by X-ray crystallography. Crystal data: 1, C20H20N16CrK, monoclinic, space group C2/c, a = 1611.2(5), b = 1050.6(3), c = 1609.0(5) pm, β = 91.69(3)°, Ζ = 4 and Rw = 0.037 for 923 diffractometer data; 2, C15H15N15CrRb, monoclinic, space group P21/n, a = 1311.9(3), b = 1139.0(4), c = 1523.3(4) pm, β = 109.39(2)°, Ζ = 4 and Rw = 0.046 for 2336 data.The crystal structure of 1 contains six-coordinated chromium and potassium cations with two pyridine ligands and

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45

Ye, Naike, and Joseph M. Tanski. "The crystal structure of 5-(trifluoromethyl)picolinic acid monohydrate reveals a water-bridged hydrogen-bonding network." Acta Crystallographica Section E Crystallographic Communications 76, no. 11 (2020): 1752–56. http://dx.doi.org/10.1107/s2056989020013523.

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The title compound [systematic name: 5-(trifluoromethyl)pyridine-2-carboxylic acid monohydrate], C7H4F3NO2·H2O, is the acid hydrate of a pyridine with a carboxylic acid group and a trifluoromethyl substituent situated para to one another on the aromatic ring. The molecule forms a centrosymmetric water-bridged hydrogen-bonding dimer with graph-set notation R 4 4 (12). Hydrogen-bonding distances of 2.5219 (11) and 2.8213 (11) Å are observed between the donor carboxylic acid and the bridging water acceptor, and the donor water and carbonyl oxygen acceptor, respectively. The dimers are further lin

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Wang, Li, and Hui Li. "Methyl 1-methyl-8-nitro-5-oxo-1,2,3,5-tetrahydroimidazo[1,2-a]pyridine-7-carboxylate." Acta Crystallographica Section E Structure Reports Online 63, no. 11 (2007): o4427. http://dx.doi.org/10.1107/s1600536807051379.

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In the title compound, C10H11N3O5, the dihedral angle between the fused pyridine and imidazolidine ring planes is 4.88 (12)°. The crystal structure is stabilized by weak C—H...O intermolecular interactions.

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47

Kashparova, Vera P., Irina B. Ilchibaeva, Nina V. Smirnova, Efim Sh Kagan, Elena N. Shubina, and Irina Yu Zhukova. "PROMOTING EFFECT OF PYRIDINE BASES ON INDIRECT ELECTROCHEMICAL OXIDATION OF ALCOHOLS." IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENII KHIMIYA KHIMICHESKAYA TEKHNOLOGIYA 62, no. 9 (2019): 33–39. http://dx.doi.org/10.6060/ivkkt.20196209.5923.

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The effect of pyridine on the reaction of indirect electrochemical oxidation of alcohols to carbonyl compounds by the catalytic system of 4-acetylamino-2,2,6,6-tetramethylpiperidine-1-oxyl - iodine in a two-phase aqueous-organic medium: methylene chloride - an aqueous solution of sodium bicarbonate (pH 8.6) was studed. It was shown that the process of indirect electrochemical oxidation of alcohols is accelerated by 1.5–2 times in the presence of pyridine. The corresponding aldehydes and ketones are formed with a high yield (75-95%) after passing 2-2.2 F of electricity. Additionally, the effect

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MURASHIMA, Seiko, Yugo NARITA, Masahiro SAITOH, et al. "Antiplatelet effects of 2-methyl-3-(1, 4, 5, 6-tetrahydronicotinoyl) pyrazolo [1, 5-a]pyridine (KC-764)." Japanese Journal of Thrombosis and Hemostasis 4, no. 3 (1993): 146–52. http://dx.doi.org/10.2491/jjsth.4.146.

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49

Noh, Kyungkyou, та Jaheon Kim. "Poly[(μ3-5-tert-butylbenzene-1,3-dicarboxylato)dipyridinecobalt(II)]". Acta Crystallographica Section E Structure Reports Online 69, № 11 (2013): m579—m580. http://dx.doi.org/10.1107/s1600536813026640.

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In the title compound, [Co(C12H12O4)(C5H5N)2]n, the CoIIcation is coordinated by four O atoms from three 5-tert-butylbenzene-1,3-dicarboxylate anions and two N atoms from pyridine molecules in a distorted octahedral geometry. One carboxylate group of the anionic ligand chelates a CoIIcation while another carboxylate group bridges two CoIIcations, resulting in a polymeric layer parallel to (101). Weak C—H...O hydrogen bonds occur between adjacent polymeric layers. In the crystal, one of pyridine molecules is equally disordered over two positions.

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50

Galvez, Enrique, Isabel Iriepa, Antonio Lorente, Jose Miguel Mohedano, Feliciana Florencio, and Severino Garcia-Blanco. "Synthesis and structural study of aminals derived from 8-aminoquinoline and 1-aminonaphtalene." Canadian Journal of Chemistry 65, no. 4 (1987): 687–92. http://dx.doi.org/10.1139/v87-117.

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Reaction of 8-aminoquinoline with pyridine-2-carboxaldehyde (2), pyridine-3-carboxaldehyde (3), pyridine-4-carboxaldehyde (4), and benzaldehyde (5) yields the corresponding aminals or Schiff's bases according to reaction conditions; analogous results are obtained from the reaction of 1-amino-naphtalene with pyridine-2-carboxaldehyde (6). On the other hand, reaction of 8-aminoquinoline with thiophene-2-carboxaldehyde or pyrrole-2-carboxaldehyde yields neither the aminal nor the Schiff's base. Crystals of 4 (C24H19N5) belong to the triclinic space group [Formula: see text]. Cell dimensions are a

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