Process to prepare diazinon
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United States of America Patent
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Nov 5, 1996
Issued Date -
N/A
app pub date -
Jul 8, 1994
filing date -
Jun 23, 1994
priority date (Note) -
Expired
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Abstract
Diazinon is prepared by coverting 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, wherein the quantity of potassium carbonate used relative to the starting hydroxypyrimidine is less than molar and desirably of a ratio in the range of 0.55 to 0.75.
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