Anodic oxidation of a series of hydrazones in the presence of heteroaromatic and Schiff bases were performed in acetonitrile-tetraethylammonium perchlorate electrolyte solution at platinum using controlled potentials. As a result of four-electron oxidation several s-trimlo [4, 3-a] pyridinium perchlorates (1-9), s-triazolo [4, 3-a] quinolinium perchlorate (lo), s-triazolo [3, 4-a] isoquinolinium perchlorate (1 I), and s-triazolo [4, 3-a] benzo [flquinolinium ...