[F:1][C:2]1[CH:7]=[CH:6][C:5]([C:8](N(C)C)=[CH:9][C:10]2[CH:15]=[CH:14][C:13]([C:16]([F:19])([F:18])[F:17])=[CH:12][CH:11]=2)=[CH:4][CH:3]=1.C(O)(=[O:25])C.Cl>O>[F:1][C:2]1[CH:7]=[CH:6][C:5]([C:8](=[O:25])[CH2:9][C:10]2[CH:15]=[CH:14][C:13]([C:16]([F:19])([F:18])[F:17])=[CH:12][CH:11]=2)=[CH:4][CH:3]=1Into a 200 ml four-necked flask equipped with a thermometer, a stirrer and a reflux condenser, 15.5 g (50 mmol) of 1-(4-fluorophenyl)-2-(4-trifluoromethylphenyl)-N,N-dimethylethenylamine, 80 ml of acetic acid and 30 ml of concentrated hydrochloric acid were charged and reacted with stirring for two hours under refluxing under heating by an oil bath. After completion of reaction, 500 ml of water was added, and precipitated crystals were collected by filtration and washed with a 2% sodium hydrogen carbonate aqueous solution and water. Then, the crystals were further washed and purified with 20 ml of n-hexane and then vacuum-dried to obtain 12.7 g (yield: 90.3%) of the desired compound (melting point: 93-95° C.) as slightly yellow crystals.
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