Results 11 to 20 of about 18,349 (284)
Convenient approaches to the synthesis of 6-amino- and 6-oxoimidazo[4,5-b]pyrazolo[3,4-e]pyridines
Журнал органічної та фармацевтичної хімії, 2021 Aim. To develop convenient approaches to the synthesis of 6-amino- and 6-oxoimidazo[4,5-b]pyrazolo[3,4-e]pyridines as promising biologically active scaffolds. Results and discussion.
Georgiy G. Yakovenko, Mikhailo V. Vovk
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Molecules, 2022 Amides, anhydrides, esters, and thioesters of 2H-azirine-2-carboxylic acids were prepared by a rapid procedure at room temperature involving FeCl2-catalyzed isomerization of 5-chloroisoxazoles to 2H-azirine-2-carbonyl chlorides, followed by reaction with
Anastasiya V. Agafonova +2 more
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Effects of solvent and structure on the reactivity of 6-substituted nicotinic acids with diazodiphenylmethane in aprotic solvents [PDF]
Journal of the Serbian Chemical Society, 2009 The rate constants for the reactions of diazodiphenylmethane (DDM) with 6-substituted nicotinic acids in aprotic solvents at 30°C were determined. The obtained second order rate constants in aprotic solvents, together with literature data for benzoic and
Drmanić Saša Ž. +2 more
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The effects of solvents and structure on the electronic absorption spectra of the isomeric pyridine carboxylic acid N-oxides [PDF]
Chemical Industry and Chemical Engineering Quarterly, 2013 The ultraviolet absorption spectra of the carboxyl group of three isomeric pyridine carboxylic acids N-oxides (picolinic acid N-oxide, nicotinic acid N-oxide and isonicotinic acid N-oxide) were determined in fourteen solvents in the wavelength range ...
Drmanić Saša Ž. +4 more
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2-(Carboxymethylsulfanyl)pyridine-3-carboxylic acid monohydrate [PDF]
Acta Crystallographica Section E Structure Reports Online, 2010 The title compound, C(8)H(7)NO(4)S·H(2)O, was obtained by reaction of 2-mercaptopyridine-3-carboxylic acid with chloro-acetic acid. In the mol-ecular structure, the dihedral angle between the two least-squares planes defined by the pyridine ring and the carb-oxy group is 8.32 (9)°.
Xiao-Juan Wang, Yun-Long Feng
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A Simple Method for Synthesis of Active Esters of Isonicotinic and Picolinic Acids
Molecules, 2001 A method for preparation of the p-nitrophenyl-, N-hydroxysuccinimidyl- and pentafluorophenyl esters of isonicotinic and picolinic acids from the corresponding acids is reported.
Jørn B. Christensen
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Separations, 2021 Natural phenol and phenolic acids are widely distributed in the plant kingdom and the major dietary sources include fruits and beverages derived therefrom.
Alessio Incocciati +4 more
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Recurrence of Carboxylic Acid−Pyridine Supramolecular Synthon in the Crystal Structures of Some Pyrazinecarboxylic Acids [PDF]
, 2016 X-ray crystal structures of pyrazinic acid 1 and isomeric methylpyrazine carboxylic acids 2−4 are analyzed to examine the occurrence of carboxylic acid−pyridine supramolecular synthon V in these heterocyclic acids. Synthon V, assembled by (carboxyl)O−H···
Ashwini Nangia (1400761) +2 more
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Reaction of Pyridine Bases with Carboxylic Acids in Benzene [PDF]
Bulletin of the Chemical Society of Japan, 1977 Abstract The reaction of pyridine bases with aliphatic monocarboxylic acids has been studied by means of the partition method. Partition was carried out at 25 °C between benzene and 0.10 mol dm−3 (Na, H) ClO4 aqueous solution, the total concentration of pyridine base and that of carboxylic acid being less than 2×10−2 mol dm−3 and 1.0 mol
Katsumi Hirose, Motoharu Tanaka
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Vanadium. Part IX. Oxo-Vanadium (IV) Complexes of Pyridine Carboxylic Acids [PDF]
, 1967 The paper describes a number of Oxo-vanadium (IV) complexes of pyridine mono-, di- and tri-carboxylic acids. Pyridine 2-carboxylic acid produces (I) [VO (H2O) (Pic)2 blue, (2) [VO(X) (Pic)2] (where X=pyridine, aniline, α-picoline etc), green and (3) [VO ...
S. Ghosh, R. L. Dutta
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