[CH3:1]C(C)([O-])C.[K+].[C:7]1([CH:13]=[CH:14][C:15]2[CH:20]=[CH:19][CH:18]=[CH:17][CH:16]=2)[CH:12]=[CH:11][CH:10]=[CH:9]C=1.CCCCCC.[CH:27]([Br:30])(Br)[Br:28]>O>[Br:28][C:27]1([Br:30])[CH2:1][C:14]1([C:13]1[CH:9]=[CH:10][CH:11]=[CH:12][CH:7]=1)[C:15]1[CH:16]=[CH:17][CH:18]=[CH:19][CH:20]=1Under a nitrogen atmosphere, potassium tert-butoxide (14.8 g, 132 mmol), diphenylethylene (13.2 g, 73.3 mmol) and hexane (75 ml) were placed in a reaction flask and cooled to −5° C. To this, bromoform (24.1 ml, 95.4 mmol) was added gradually, and the mixture was stirred at the same temperature for 30 minutes. Then, water was added to the reaction mixture and the organic layer was extracted with toluene. The toluene extract was dried over anhydrous magnesium sulfate and then the solvent was removed under reduced pressure. The residue was recrystallized from a mixed solvent of isopropanol and toluene to give the title compound (14.4 g, 56%) as white crystal.
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