Titanium(salen)-Catalysed Synthesis of Di- and Trithiocarbonates from Epoxides and Carbon Disulfide

摘要

The combination of a bimetallic titanium(salen) complex [Ti(salen)O](2) and either tetrabutylammonium bromide or tributylamine forms a highly active catalyst system for the reaction between epoxides and carbon disulfide to lead to di- and/or trithiocarbonates. Reactions can be performed at 90 degrees C by using just 0.5-1.0mol% of the catalysts. The reactions proceed with the inversion of the epoxide configuration and on the basis of kinetic and spectroscopic evidence, a mechanism to account for the results is proposed.