Strategies for the Immobilization of Homogeneous Catalysts and Their Use in the Synthesis of Carbamates

Different methods of immobilization of N,N'-bis(salicylidene)ethylenediaminocobalt(II), [Co(salen)] complex, using K10 montmorillonite and silica have been used. These supported catalysts are active in the oxidative carbonylation of aniline using NaI as a promoter. The principal products obtained are N,N'-diphenylurea and I 1-butyl-N-phenylcarbamate.