METHOD FOR PRODUCING CARBOXYLIC ESTER, AND ITS 'ONIUM' SALT AND SALT MIXTURE

摘要

PROBLEM TO BE SOLVED: To provide an improved method for producing a carboxylic ester from an alcohol and a carboxylic acid, a carboxylic chloride and a carboxylic bromide. SOLUTION: Precipitation of an 'onium' salt is prevented by subjecting the process to an esterification in the presence of an adduct ('onium' salt) of a corresponding carboxylic acid and 1,5-diaza-bicyclo[4.3.0]-non-2-ene('DBN') or 1,8-diaza-bicyclo[5.4.0]-undec-7-ene('DBU'), or in the presence a corresponding carboxylic acid and the 'onium' salt of the corresponding carboxylic acid.