The oxidative coupling reactions of ethyl α-cyano-P-X substituted phenyl acetates (X=OCH3, CH3, H, CL, NO2) with Cu^2+-TMEDA-O2 system give meso-and dl-diethyl 2, 3-dicyano-2, 3-di (p-X substituted phenyl )succinates. on the basis of the stereochemistry and IR , 1H NMR and EPR determination of the reactive interme-diates of the oxidative coupling reactions, the mechanism was suggested. two OH^- of the catalyst [Cu^2+(OH^-)TMEDA]2Cl2^- are substituted by CN of substrates ad give the reactive intermediates [Cu^2+(S-CN)TMEDA]2Cl2(OH^-)2.OH^- extracts α -proton of the substrate and gives the orresponding carbanion .an electron transfers from carbanion to Cu^2+. the coupling of the formated radicals produces diethyl ester dimers. it carries the reactions through that Cu^+ is oxidated to Cu^2+ by oxygen.

Key words: REACTION MECHANISM, INFRARED SPECTROPHOTOMETRY, BENZENE P, ETHYL ACETATE, COPPER COMPLEX, PROTON MAGNETIC RESONANCE SPECTROMETRY, CYANO GROUP, ETHANEDIAMINE, SINGLE ELECTRON TRANSFER REACTION, COUPLING REACTION