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1.The electrochemical oxidation of aroyl chloride arylhydrazones, in contrast to their chemical oxidation, can proceed by two routes, resulting in the formation of linear dimers linked in the para position of the phenyl ring attached to the amine nitrogen atom, or in the formation of 1,3,4,6-tetraaryl-1, 4-dihydro-1, 2,4, 5-tetrazines.2.The nature of the products formed by electrochemical oxidation of aroyl chloride arylhydrazones is determined by the nature and number of the substituents attached to the amine nitrogen atom of the hydrazone fragment.

1.The mechanism of the electrochemical reduction of certain substituted trimethylbenzalhydrazonium iodides on a Hg-electrode in DMFA was studied. Schemes of the electrode reactions were proposed.2.For all the salts studied, at the first one-electron step there is a reductive cleavage of the activated nitrogen-nitrogen bond, followed by the formation of a substituted benzonitrile. The latter undergoes a one-electron reduction at more negative potentials, giving an anion radical recordable by the ESR method.3.For halosubstituted salts there is a preliminary reductive cleavage of the carbon-halogen bond in the halobenzonitrile.

The electrochemical reduction of a number of symmetrically and nonsymmetrically substituted benzalazines on a mercury electrode in dimethylformamide was studied by the methods of classical, switched, and cyclic polarography as well as microelectrolysis.

The mechanisms of the electrochemical reduction of azines of acetaldehyde, acetophenone, benzophenone, and fluorenone in DMFA were discussed. It was shown by the ESR method that the dianion of fluorenone gives an electron to the initial molecule in solution, with the formation of two radical particles.