[F:1][C:2]1[CH:7]=[CH:6][C:5]([CH:8](O)[CH:9]([CH3:11])[CH3:10])=[CH:4][C:3]=1[C:13]([F:16])([F:15])[F:14].O.C1(C)C=CC(S(O)(=O)=O)=CC=1.O.[OH-].[Na+]>C1(C)C=CC=CC=1>[F:1][C:2]1[CH:7]=[CH:6][C:5]([CH:8]=[C:9]([CH3:11])[CH3:10])=[CH:4][C:3]=1[C:13]([F:14])([F:15])[F:16]4.3 g (18.2 mmol) 1-(4-fluoro-3-trifluoromethyl-phenyl)-2-methyl-propan-1-ol and 1.0 g (5.3 mmol) p-toluenesulphonic acid monohydrate in 100 mL toluene are refluxed for 3 hours using the water separator. Then the reaction mixture is combined with water and made alkaline with 1 N sodium hydroxide solution. After separation of the organic phase this is washed with water, dried with sodium sulphate and evaporated down. The oil remaining is further reacted directly.
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