Chemistry of Heterocyclic Compounds p. 1021 - 1026 (1984)
Update date:2022-08-11
Topics:
Lopyrev, V. A.
Larina, L. I.
Baumane, L. Kh.
Shibanova, E. F.
Gavar, R. A.
et al.
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 posibilities 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.
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