Esr and polarography of nitroazoles. 4. Polarographic study of nitrobenzimidazoles |
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Authors: | V. A. Lopyrev L. I. Larina L. Kh. Baumane E. F. Shibanova R. A. Gavar S. M. Ponomareva T. I. Vakul'skaya Ya. P. Stradyn' |
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Affiliation: | (1) Irkutsk Institute of Organic Chemistry, Siberian Branch, Academy of Sciences of the USSR, USSR;(2) Institute of Organic Synthesis, Academy of Sciences of the Latvian SSR, Riga |
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Abstract: | The electrochemical reduction of 2-substituted 5(6)-benzimidazoles has been studied with the aid of classical polarography and cyclic voltammetry in acetonitrile. The influence of the substituents in position 2 on the magnitudes of the half-wave potentials of the first stage is exerted by induction and resonance mechanisms with approximately the same contributions, and that on the magnitudes of the half-wave potentials of the second stage predominantly by the resonance mechanism. The possibilities of taking the radical-stabilizing factor into account in the correlations are discussed. In order to study the 2-substituted 5(6)-nitrobenzimidazole series, their pKa values in acetonitrile have been determined by potentiometric titration.For communication 3, see [1].Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 9, pp. 1246–1251, September, 1984. |
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