Process for the manufacture of diazinon
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United States of America Patent
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Jul 27, 1993
Issued Date -
N/A
app pub date -
Mar 16, 1992
filing date -
Sep 28, 1989
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Expired
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Abstract
Diazinon is prepared by converting the starting hydroxypyrimidine to its potassium salt by reacting it with potassium carbonate in an organic solvent after removal of the water by azeotropic distillation, and reacting the resulting non-aqueous salt with diethyl thiophosphoryl chloride and recovering the diazinon formed. The solvent used is either MIBK or an aliphatic hydrocarbon desirably containing 1-20% MEK.
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