CN.[CH2:3]([N:5](CC)CC)C.[Cl:10][C:11]([Cl:17])([S:15]Cl)[CH:12]([Cl:14])[Cl:13].[C:18]([Cl:21])(Cl)=[O:19]>C(#N)C>[Cl:10][C:11]([S:15][N:5]([CH3:3])[C:18]([Cl:21])=[O:19])([Cl:17])[CH:12]([Cl:14])[Cl:13]A solution of 3.1 g (0.1 mole) methylamine and 10.1 g (0.1 mole) triethylamine in 100 ml acetonitrile was added dropwise to a solution of 23.4 g (0.1 mole) 1,1,2,2-tetrachloroethylsulfenyl chloride in 200 ml acetonitrile at about 0°-5° C. Into the reaction mixture was then bubbled 9.9 g (0.1 mole) phosgene. The reaction was stirred at about 25° C for about 17 hours. The acetonitrile solvent was evaporated under reduced pressure and the residue was diluted with benzene and filtered to give a filtrate solution of N-1,1,2,2-tetrachloroethylthio N-methyl carbamoyl chloride in benzene.
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