C[S-:2].[Na+].Cl[C:5]1[CH:10]=[CH:9][C:8]([S:11]([C:14]2[CH:19]=[CH:18][CH:17]=[CH:16][CH:15]=2)(=[O:13])=[O:12])=[CH:7][CH:6]=1.Cl>CN(C)P(N(C)C)(N(C)C)=O>[C:14]1([S:11]([C:8]2[CH:7]=[CH:6][C:5]([SH:2])=[CH:10][CH:9]=2)(=[O:13])=[O:12])[CH:15]=[CH:16][CH:17]=[CH:18][CH:19]=11.25 g of sodium thiomethylate are added under a nitrogen atmosphere to a solution of 15 g (0.0593 mol) of 1-chloro-4-(phenylsulfonyl)benzene in 150 ml of hexamethylphosphoramide. The mixture obtained is heated for 4 hours at 100° C. and then cooled and hydrolyzed in an ice/water mixture. The reaction medium obtained is extracted with ethyl acetate and the aqueous phase obtained is then poured into a 4 N solution of hydrochloric acid at 0° C. The product formed precipitates. After filtration, washing with water until the pH of the washings is neutral, and drying, 13.44 g (yield: 90.5%) of the expected product are obtained. M.p.=117° C.
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