TRANSESTERIFICATION REACTION OF DIMETHYL CARBONATE CATALYZED BY TIN AND TITANIUM COMPLEXES

摘要

Dimethyl carbonate (DMC) is drawing more and more attention in the chemical industry due to its unique physical and chemical properties: first, its versatility as reagent and solvent; second, its non-toxicity for human health and environment [1]. DMC has been used as an attractive eco-friendly alternative to methylhalide (CH_3X), dimethyl sulfate (DMS) and phosgene for methylation and carbonylation processes [2]. The transesterifecation reactions between DMC and phenol or aliphatic hydroxy compound to produce diphenyl carbonate (DPC) or higher mass dialkyl carbonates are promising processes for many applications. Phosgene, a very active reagent, can react with many reagents without catalysts. While the transesterification of DMC and hydroxyl compound occurs only when a suitable catalyst is used because DMC is much stabler than phosgene.