PROCESS FOR PRODUCING ASYMMETRICAL CHAIN CARBONIC ACID ESTER

摘要

PURPOSE: A process for preparing an asymmetrical chain carbonic acid ester by using a specific catalyst comprising an alkoxide salt of the group IA as a catalytically active component is provided which produces the title compound in a high yield without side products. CONSTITUTION: A process comprises subjecting two kinds of symmetrical chain carbonic acid esters to interesterification in the presence of a specific catalyst, wherein the amount of specific catalyst to be used as a reaction catalyst is 0.0001 to 5% by weight of an alkoxide salt of the group IA. The symmetrical chain carbonic acid esters are selected from the group consisting of dimethyl carbonate, diethyl carbonate, dipropyl carbonate and dibutyl carbonate. The asymmetrical chain carbonic acid ester is useful as a solvent, a reagent for various organic syntheses and especially a solvent for a secondary battery of lithium ion. The process has an advantage of having almost no loss by the decomposition of a reactant even when a reaction mixture is subjected to separation in a distillation apparatus after reaction.