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温度

0 °C

Into a reactor were introduced 19.4 g (100 mmol) of the 1,1-diphenylpropene and 78 mL of 1,2-dichloroethane under a nitrogen atmosphere. The contents were cooled to 0° C., and 15.9 g (100 mmol) of bromine was gradually added dropwise thereto. The resultant mixture was stirred at room temperature for 1 hour. Thereafter, 32.4 mL (400 mmol) of pyridine and 156 mL of toluene were added thereto and this mixture was stirred at 80° C. for 3 hours. After being cooled, the reaction mixture was washed with saturated aqueous sodium hydrogen carbonate solution and saturated aqueous sodium chloride solution and then dried with anhydrous magnesium sulfate. Thereafter, the solvent was removed under reduced pressure. The concentrate was purified by column chromatography and then recrystallized from methanol to obtain 14.5 g (53%) of the target compound as white crystals.

1. temperatureAfter being cooled
2. washthe reaction mixture was washed with saturated aqueous sodium hydrogen carbonate solution and saturated aqueous sodium chloride solution
3. dry with materialdried with anhydrous magnesium sulfate
4. customThereafter, the solvent was removed under reduced pressure
5. customThe concentrate was purified by column chromatography
6. customrecrystallized from methanol