| abstract |
When the carboxylic acid bromodifluoroethyl ester is sulfinated using a sulfinating agent, an ammonium salt of 2- (alkylcarbonyloxy) -1,1-difluoroethanesulfinate is obtained by using an organic base. This is oxidized to obtain ammonium salt of 2- (alkylcarbonyloxy) -1,1-difluoroethanesulfonic acid salt. Using this as a raw material, 2-alkylcarbonyloxy-1,1-difluoroethanesulfonic acid onium salts are obtained by exchanging with onium salts or through onium salts through saponification and esterification. |