Potassium Carbonate → 2-Cyano-3-(dimethoxythiophosphoryloxy)-5-methyl-thiophene

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11.2 g of potassium carbonate and 12.8 g of O,O-dimethyl chlorothiophosphate were added to a solution of 11.2 g of 2-cyano-3-hydroxy-5-methyl-thiophene in 200 ml of acetone and the mixture was stirred for 15 hours at 20° C. and was then filtered. The filtrate was evaporated to dryness and the residue was chromatographed over silica gel. Elution with a 7-3 cyclohexane-ethyl acetate mixture yielded 18.7 g of 2-cyano-3-(dimethoxythiophosphoryloxy)-5-methyl-thiophene with a refractive index of nD20 =1.539.

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