Process for production of thiophosphonates

摘要

Thiophosphonate compounds having the formula <IMAGE> in which R is alkyl, haloalkyl or aryl; X is chloro or SR2; R1 is alkyl or aryl; and when X is SR2 then R2 is a group identical to R1, or R1 and R2 taken together form an optionally alkyl-substituted polymethylene group, are prepared by reaction of a thiophosphonodichloride with a mercaptan in the presence of a catalytic amount of a quaternary ammonium or phosphonium salt, a tertiary amine or hydrohalide thereof or an alkali metal halide combined with a Crown ether, in the substantial absence of a base.