[OH-].[Na+].[OH:3][C:4]1[CH:20]=[CH:19][C:7]([C:8]([S:10][C:11]2[CH:16]=[CH:15][C:14]([O:17][CH3:18])=[CH:13][CH:12]=2)=[O:9])=[CH:6][CH:5]=1.[C:21](Cl)([Cl:23])=[S:22].[Cl-].[Ca+2].[Cl-]>O.C(Cl)(Cl)Cl>[Cl:23][C:21]([O:3][C:4]1[CH:20]=[CH:19][C:7]([C:8]([S:10][C:11]2[CH:16]=[CH:15][C:14]([O:17][CH3:18])=[CH:13][CH:12]=2)=[O:9])=[CH:6][CH:5]=1)=[S:22]A solution of sodium hydroxide (1.01 g) in 2 ml of water was added to a cool (10° C. or below) solution of 5.50 g of S-(4-methoxyphenyl) 4-(hydroxy)thiobenzoate and 2.42 ml of thiophosgene in 75 ml of chloroform. Vigorous stirring was continued for 2 hours at room temperature and the filtered solution treated with calcium chloride for a further 30 minutes. Evaporation of the filtered solution and chromatography of the residue on silica gel using hexane/ethyl acetate mixtures as eluant gave 2.75 g of the title compound.
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