Purification of o,s-dimethyl phosphoramidothioate

Details Purification of o,s-dimethyl phosphoramidothioate Purification of o,s-dimethyl phosphoramidothioate

C - Chemistry, Metallurgy

07

F

C07F 9/24 (2006.01) C07F 9/02 (2006.01)

Patent

CA 2280110

The present invention provides a method for making O,S-dimethyl phosphoramidothioate. In accordance with this process, O,O-dimethyl phosphoramidothioate is isomerized in the presence of dimethyl sulfate to form a reaction mixture; the reaction mixture is then passed through a wiped film evaporator at a temperature of from about 55°C to about 120°C and a pressure of from about 3 to about 10 mm Hg, with the distillate containing O,S-dimethyl phosphoramidothioate, unreacted O,O-dimethyl phosphoramidothioate and by-products, and the residue containing O,S-dimethyl phosphoramidothioate in an amount greater than the amount of O,S-dimethyl phosphoramidothioate contained in the reaction mixture prior to distillation.

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