C(=O)([O-])[O-].[K+].[K+].[P:7](Cl)([O:11][CH3:12])([O:9][CH3:10])=[O:8].[C:14]([C:16]1[S:17][C:18]([O:22][CH2:23][CH2:24][CH2:25][CH3:26])=[CH:19][C:20]=1[OH:21])#[N:15]>C(#N)C>[C:14]([C:16]1[S:17][C:18]([O:22][CH2:23][CH2:24][CH2:25][CH3:26])=[CH:19][C:20]=1[O:21][P:7]([O:11][CH3:12])([O:9][CH3:10])=[O:8])#[N:15]7.7 g of potassium carbonate and 7.7 g of O,O-dimethyl chlorophosphate were added to a solution of 11 g of 2-cyano-3-hydroxy-5-n-butoxy-thiophene in 150 ml of acetonitrile and the mixture was stirred for 16 hours at 20° C. and was filtered. The filtrate was evaporated to dryness under reduced pressure and the residue was dissolved in ether. The ether solution was washed with water containing 100 g/l of sodium chloride and then with 0.1N sodium hydroxide solution containing 100 g/l of sodium chloride. The ether phase was dried and treated with activated carbon, filtered and concentrated to dryness to obtain 12.5 g of 2-cyano-3-(dimethoxyphosphoryloxy)-5-n-butoxy-thiophene with a refractive index of nD20 = 1.511.
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