Process for the preparation of O,O-dialkyl-S-benzyl thiophosphat

Details Process for the preparation of O,O-dialkyl-S-benzyl thiophosphat Process for the preparation of O,O-dialkyl-S-benzyl thiophosphat

1976-01-13

1977-12-20

Sutto, Anton H.

Chemistry of carbon compounds

Dipeptides, e.g., aspartame, anserine, carnosine, etc.

260963, C07F 9165

Patent

active

040642003

ABSTRACT:
O,O-Dialkyl-S-benzyl thiophosphates are obtained by reacting a diester of phosphorous acid such as dimethyl phosphite or diethyl phosphite, in an organic solvent such as toluene or xylene which is sparingly soluble or insoluble in water, with sulfur and an alkali or alkaline earth metal hydroxide or oxide such as NaOH or Ca(OH).sub.2, extracting the reaction product with water and then reacting the extract with a benzyl halide. In this manner, O,O-dialkyl-S-benzyl thiophosphates useful as agricultural and horticultural bactericidal and insecticidal agents are industrially advantageously obtained in a high purity and in a high yield.

REFERENCES:
patent: 2862016 (1958-11-01), Sallmann et al.
patent: 3636144 (1972-01-01), Tsuchiya et al.
patent: 3832425 (1974-08-01), Franke

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