Synthesis of vinyl-SCF3 3: To a 10 mL tube were sequentially added ethene-1,1-diyldibenzenes (0.2 mmol, 1 equiv.), reagent (0.24 1.2 equiv.), (0.01 mmol, 5 mol%), sodium bromide (0.2 mmol, 1.0 equiv.), and acetonitrile (1 mL). The reaction mixture was stirred under 40w blue LED irradiation for 24 h allowing temperature to rise to 50 °C due to the proximity to the light. After completion, the reaction was quenched with a saturated brine solution, then extracted with ethyl acetate (3 × 10 mL). The combined organic layers were dried over anhydrous sodium sulfate and concentrated under reduced pressure. The crude material was then purified by column chromatography on silica gel.