PROCESS FOR PREPARING AMINE SALTS OF ACID O,S-DIALKYLTHIOPHOSPHORIC ESTERS

摘要

The invention relates to an improved process for making amine salts of acid O,S-dialkylthiophosphoric acid esters of the general formula (I) IMAGE (I) in which R1 stands for the ammonium ion of primary or secondary aliphatic, cycloaliphatic or aromatic amines or of a heterocyclic nitrogen base and R2 and R3 each stand for an alkyl group by subjecting an O,O,S-trialkyl-thiophosphate to partial dealkylation and forming the salt of the dealkylated product by treatment with an amine corresponding to the ammonium ion R1. In the improved process an O,O,S-trialkylthiophosphate of the general formula (II) IMAGE (II) in which R2 and R3 have the meanings given above, is mixed with at least stoechiometric proportions of water and an amine corresponding to the ammonium ion R1, the resulting mixture is reacted, with agitation, over a period of about 3 to 8 hours at a temperature within the range 0 DEG to 120 DEG C., and the amine salt of the general formula (I) is separated from the reaction mixture.