| abstract |
Carboxylic acid chlorides can contain small amounts of carboxylic acid fluorides, HF or hydrolyzable fluoride. Corrosive fluorides or HF then form during the esterification. DOLLAR A describes a process for the preparation of carboxylic acids, carboxylic acid chlorides or carboxylic acid esters from carboxylic acid chlorides and alcohols correspondingly containing acid fluorides or hydrolyzable fluoride under the catalytic action of “onium” salts of carboxylic acids, in which the products are obtained free of low fluoride. The process is particularly suitable for the preparation of esters of trifluoroacetic acid, chlorodifluoroacetic acid and trifluoroacetoacetic acid and difluoroacetoacetic acid. |