[F:1][C:2]1[CH:7]=[CH:6][C:5]([C:8]([C:16]2[CH:21]=[CH:20][C:19]([F:22])=[CH:18][CH:17]=2)(O)[CH:9]2[S:14][CH2:13][S:12][CH2:11][S:10]2)=[CH:4][CH:3]=1.C1(C)C=CC(S(O)(=O)=O)=CC=1.C1C=CC=CC=1>C1CCCCC1>[F:22][C:19]1[CH:20]=[CH:21][C:16]([C:8](=[C:9]2[S:10][CH2:11][S:12][CH2:13][S:14]2)[C:5]2[CH:4]=[CH:3][C:2]([F:1])=[CH:7][CH:6]=2)=[CH:17][CH:18]=1A mixture of 2.0 g of 2-{bis(4-fluorophenyl)hydroxymetyl}-1,3,5-trithiane, 0.2 g of p-toluenesulfonic acid and 50 ml of benzene was refluxed with heating for 15 minutes by means of a Dean-Stark reflux condenser. After being cooled, the mixture was extracted with ethyl acetate and the extract was washed with a saturated aqueous sodium hydrogencarbonate solution. The washed extract was dried over anhydrous magnesium sulfate and the solvent was removed by distillation under reduced pressure to obtain a material, which was recrysallized from cyclohexane to give 1.7 g of the desired compound.
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