STUDY OF THE ELECTROCHEMICALLY INITIATED CYANOMETHYLATION OF AZOMETHINES BY MEANS OF THE MNDO AND AM1 SEMIEMPIRICAL METHODS

The semiempirical methods (MNDO and AM1) have been used in the quantum chemical study of electrochemically initiated cyanomethylation of azo methines. Reaction steps leading to the main product of the studied re action, beta-aminonitrile, have been described. The stationary points on the reaction path have been found and the activation enthalpies of reaction steps have been determined. Three possible mechanisms for the abstraction of a proton from acetonitrile have been described (by azo methine radical anion, by beta-aminonitrile anion, and by hydrogenated azomethine anion). At the MNDO level, the abstraction of a proton by azomethine radical anion has the highest activation enthalpy (Delta H = 197 kJ mol(-1)) and the abstraction of a proton by hydrogenated azom ethine anion has the lowest activation enthalpy (Delta H = 146 kJ mol( -1)). The activation enthalpy of the next reaction step (the reaction of acetonitrile anion with azomethine) is low compared to the activati on enthalpies of the previous reation steps (Delta H = 12 kJ mol(-1)).