By BERNARD DE JESO and JEAN-CLAUDE POMMIER* (Laboratoire de Chimie Organique et Laboratoire de Clzirnie des Compost% Organiques du Siliciuwa et de I'Etain, associe' au CNRS, Universite de Bordeaux I, 33405 Talence, France) ... Summary Partial niethanolysis of organo-tin or -magnesium salts of imines leads to secondary enamines which are stable in aprotic media allowing the study of their physical and chemical properties.