Polarographic reduction of arylhydrazones of methylglyoxal, diketobutyric acid and ethyl diketobutyrate in dimethylformamide

1. Employing classical and cyclic polarography, and polarography with a Kalousek switch, a study was made of the electrochemical reduction of some phenyl-substituted arhylhydrazones of methylglyoxal, diketobutyric acid and its ethyl ester in dimethylformamide. 2. The nitro derivatives of the arylhydrazones form the most stable anion-radicals. 3. It is postulated that an intramolecular hydrogen bond is present in theo-nitro-substituted arylhydrazones, which is formed by the hydrazone proton and the nitro group.