Continuous process for the preparation of N-monomethylamide of O

Details Continuous process for the preparation of N-monomethylamide of O Continuous process for the preparation of N-monomethylamide of O

1976-11-15

1978-04-11

Sutto, Anton H.

Chemistry of carbon compounds

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

260943, C07F 9165

Patent

active

040839001

ABSTRACT:
The N-monomethylamide of O,O-dimethyl-dithiophosphorylacetic acid is prepared continuously, in the form of essentially pure, beautiful colorless crystals, by reacting the methyl ester of O,O-dimethyldithiophosphoryl acetic acid with a 34% aqueous solution of methylamine (CH.sub.3 NH.sub.2) at a temperature between 0.degree. C and 10.degree. C, in water containing a surfactant which is an alkyl sulphonate or an alkylarylsulphonate and, as an essential feature of the process, recycling, back to the reaction vessel, from 1/10 to 1/20 of the slurry obtained as a result of the reaction between the methyl ester of O,O-dimethyl-dithiophosphorylacetic acid and the 34% solution of CH.sub.3 NH.sub.2.

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