Experimental procedure: to a solution of 1,1-diphenylethylene (181.3 mg, 1.0 mmol) in diglyme (5 mL) is added a diglyme solution (10 mL) of sodium bromodifluoroacetate (78 mg, 0.40 mmol) dropwise for 10 min at 150 °C. Then, the reaction mixture is stirred for 5 min at 150 °C. After cooling to r.t., the reaction is quenched with ice water (30 mL). The organic materials are extracted with hexane (4 × 50 mL) and the combined organic layers are washed with brine (200 mL) and dried (Na₂SO₄). After removal of the solvent under reduced pressure, the residue is purified by silica gel column chromatography (hexane:EtOAc=100:1) to give 1,1-difluoro-2,2-diphenylcyclopropane (231.6 mg, 99%) as a colorless solid.