Abstract
Methods for the synthesis of 1,4-dihydropyridine-3,5-di- and 4-aryl-5-oxo-4,5-dlhydro-1H-indeno[1,2-b]pyridine-3-carbothionic acid ethyl esters were developed. A comparative analysis of the physicochemical characteristics of this series of substances is given.Their reactivities in electrochemical and chemical oxidation reactions were studied. The electrochemical oxidation potentials of the thionic acid esters are found in a lower anodic range as compared with their oxygen analogs. According to the ionization constants, the thionic acid esters of 4,5-dihydroindenopyridines are stronger acids than the carbonyl esters; this is explained by participation of the free 3d orbitals of the sulfur atom in stabilization of the anion.
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, No.2, pp. 210–216, February, 1984.
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Vigante, B.A., Ozols, Y.Y., Dubur, G.Y. et al. 1,4-Dihydropyridine-3,5-di-and 2-methyl-4-aryl-5-oxo-4,5-dihydro-1H-indeno[1,2-b]pyridine-3-carbothionic acid ethyl esters. Chem Heterocycl Compd 20, 170–176 (1984). https://doi.org/10.1007/BF00506287
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DOI: https://doi.org/10.1007/BF00506287