The reaction of carboxylic acid chlorides with O,O-dialkyldithiophosphoric acids

At high temperature (130 o C), carboxylic acid chlorides react with O,O-dialkyldithiophosphoric acids (RO) 2 P(=S)(SH), Ia-c to give the corresponding dithiester RC(=S)(SR). II varying yields, while benzoyl chloride reacts with compounds Ia,b at 20 o C to give the corresponding S-benzoyl-O,O-dialkyldithiophosphate (RO) 2 P(=S) [SC(=O)C 6 H 5 ]. Mechanistic consideration on the formation of the products are discussed