MECHANISM AND PRODUCTS OF ELECTROCHEMICAL REDUCTION OF 4-NITROPHENYL-2,6-DIMETHYL-3,5-DICYANO-1,4-DIHYDROPYRIDINES IN DIMETHYLFORMAMIDE

Article abstract of DOI:10.1007/BF00633503

Free anion radicals of the nitrobenzene and nitrosobenzene type, which were identified by EPR spectroscopy, are formed in the electrochemical reduction of isomeric 4-(nitrophenyl)-2,6-dimethyl-3,5-dicyano-1,4-dihydropyridines on mercury and solid electrodes.Reduction of the dihydropyridine ring is observed only for N-substituted p- and m-nitrophenyl derivatives of 1,4-dihydropyridine.An intermediate with a 2-pyridonemethide structure was identified; a set of primary and secondary chemical reactions that are associated with the electrolytic reduction of the investigated compounds is presented.