Method for purifying O, S-dimethyl N-acetylphosphoramidothioate

  • US 5,684,174 A
  • Filed: 09/26/1996
  • Issued: 11/04/1997
  • Est. Priority Date: 09/22/1994
  • Status: Expired due to Fees
First Claim
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1. A method for purifying O,S-dimethyl N-acetylphosphoramidothioate, which comprises 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.

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