PURPOSE: To suppress the gelatinization of a reaction liquid to enable the handling of the liquid constantly in a low-viscosity state and prevent the gelatinization of a carbonic acid monoester salt by using a halogenated hydrocarbon as a solvent in the reaction of a sodium alkoxide with carbon dioxide gas.
CONSTITUTION: A sodium alkoxide (especially preferably sodium t-butoxide or sodium t-amyloxide) is made to react with carbon dioxide gas preferably at 0-50°C to obtain a carbonic acid monoester (especially preferably mono-t-butyl carbonate sodium salt, etc.). This reaction is carried out by using a halogenated hydrocarbon (preferably a 1-6C aliphatic hydrocarbon having ≥2 halogen atoms per one molecule, especially dichloromethane) as a reaction solvent to prevent the gelatinization of the carbonic acid monoester salt. The process is a simple and economical process for the production of dicarbonic acid diesters without using expensive particular stirring apparatus nor using a large amount of solvent. The reactional system can be maintained to a low viscosity state even by using a small amount of solvent.
HAGIWARA ISAO
OKUDA NORIKAZU
