Into a reactor were introduced 1.37 g (5.00 mmol) of the 2-bromo-1,1-diphenylpropene and 14 mL of THF under a nitrogen atmosphere. The contents were cooled to −70° C., and 3.4 mL (5.5 mmol; 1.6 M hexane solution) of butyllithium was gradually added dropwise thereto. The resultant mixture was stirred for 30 minutes. Thereafter, 1.1 mL (6.0 mmol) of chlorodiphenylphosphine was added, and this mixture was heated to room temperature and then stirred for 13 hours. Water was added to the reaction mixture. The organic layer was extracted with ethyl acetate, and the extract was dried with anhydrous magnesium sulfate. Thereafter, the solvent was removed under reduced pressure. The concentrate was recrystallized from ethanol to obtain 1.08 g (60%) of the target compound as white crystals.
