53-55Electrochemical reduction of 1-anilinomalonyl-3- methyl-4-(substituted benzeneazo )-5-pyrazolones (Ia-d) has been carried out in Britton-Robinson buffers in the pH range of 2-10. All the compounds give single, well-defined, diffusion-controlled, irreversible reduction wave at d.m.e. and well-defined cathodic peak at hanging drop mercury electrode. Based on the results obtained from polarography, cyclic voltammetry and microcoulornetry, a plausible mechanism has been suggested
