Purification of O,S-dimethyl phosphoramidothioate

Details Purification of O,S-dimethyl phosphoramidothioate Purification of O,S-dimethyl phosphoramidothioate

1998-08-17

2000-06-13

Ambrose, Michael G.

Organic compounds -- part of the class 532-570 series

Organic compounds

Phosphorus esters

558146, C07F 924

Patent

active

060751576

ABSTRACT:
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.degree. C. to about 120.degree. 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.

REFERENCES:
patent: 3309266 (1967-03-01), Magee
patent: 3639547 (1972-02-01), Magee
patent: 4389350 (1983-06-01), Lonsinger et al.

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