Method for purifying O,S-dimethyl N-acetylphosphoramidothioate

Details Method for purifying O,S-dimethyl N-acetylphosphoramidothioate Method for purifying O,S-dimethyl N-acetylphosphoramidothioate

1995-09-21

1997-04-01

Richter, Johann

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

Organic compounds

Phosphorus esters

558178, 558199, C07F 902

Patent

active

056167695

ABSTRACT:
A method for purifying O,S-dimethyl N-acetyphosphoramidothioate, which is characterized by subjecting a crude crystal of O,S-dimethyl N-acetylphosphoramidothioate to recrystallization by using a two-phase solvent system comprising water and an organic which is an aromatic hydrocarbon, an aliphatic carboxylic acid ester or aliphatic ketone, wherein the amount of water is 0.1 to 2 parts by weight and the amount of the organic solvent is 1 to 20 parts by weight to 1 part by weight of the crude O,S-dimethyl N-acetylphosphoramidothioate. A further method for purifying O,S-dimethyl N-acetylphosphoramidothioate, which is characterized by extracting O,S-dimethyl N-acetylphosphoramidothioate from an aqueous solution of crude O,S-dimethyl N-acetylphosphoramidothioate with an organic solvent which is a carbonate ester, an aliphatic carboxylic acid ester, an aliphatic ketone, an aliphatic alcohol or a mixture of two or more thereof, wherein the solubility of water in the organic solvent is in a range of from 1 to 20% by weight, and crystallizing O,S-dimethyl N-acetylphosphoramidothioate from the resulting organic phase.

REFERENCES:
patent: 3896193 (1975-07-01), Franke
patent: 3917755 (1975-11-01), Franke
Solov'ev et al., Phosphorus, Sulfur, Silicon Relat. Elem., 57(1-2), 135-41, 1991.

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