Water → 2-Phenylsulphenyl-4-trifluoromethylbenzoic acid

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Reaction Steps

A mixture of 2-phenylsulphenyl-4-trifluoromethylbenzonitrile (9 g), concentrated sulphuric acid (27 ml) and water was heated at reflux for 10 hours. The mixture was then cooled, poured into water and extracted with dichloromethane. The organic extract was extracted with aqueous sodium hydroxide. The resulting aqueous solution was acidified with aqueous hydrochloric acid to pH 1. The suspension was extracted with dichloromethane, dried over anhydrous sodium sulphate, filtered and after evaporation of the dichloromethane, 2-phenylsulphenyl-4-trifluoromethylbenzoic acid was obtained as a white solid (7.5 g), m.p. 161° C.

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