[P:1](Cl)([O:5][CH3:6])([O:3][CH3:4])=[S:2].[OH:8][C:9]1[N:13]=[C:12]([S:14][CH2:15][CH3:16])[S:11][N:10]=1>>[CH3:4][O:3][P:1]([O:8][C:9]1[N:13]=[C:12]([S:14][CH2:15][CH3:16])[S:11][N:10]=1)([O:5][CH3:6])=[S:2]Using the procedure of Example 3, dimethyl chlorothiophosphate and 3-hydroxy-5-ethylthio-1,2,4-thiadiazole were reacted to obtain 3-(dimethoxythiophosphoryloxy)-5-ethylthio-1,2,4-thiadiazole with a refractive index of nD20 = 1.559 and Rf=0.5.
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