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Electrolysis Electrolysis M 4000Preparative Electrochemical Reduction of Fluorinated Benzonitriles. -Electrochemical reduction of fluorinated benzonitriles like (I) in aprotic media is accompanied by the competing processes of fragmentation to (II) and dimerization to (III). The ratio of both processes is influenced by the use of a mediator such as anthracene or 4-cyanopyridine. The electrochemical reduction of the fluorinated benzonitrile (IV) in the presence of tetrabutylammonium thiophenolate and a mediator leads via S RN 1 nucleophilic fluorine substitution to (VI). -(EFREMOVA, N. V.; PODRY-VANOVA, L. V.; VASIL'EVA, N. V.; STARICHENKO, V. F.; SHTEINGARTS, V. D.; Russ.