Carbodiimides as a class of compounds have not been studied extensively, probably because of the rather involved methods of synthesis and the tendency of the compounds to polymerize on standing. llethods of preparation used have included desulfurization of thioureas by metal oxides2asb by sodium hypochlorite, 3 or by ethyl chloroformate in the presence of a tertiary amine'; halogenation of ureas and thioureas fo! lowed by ...
