To a glass reaction vial (5 mL size) equipped with a stir bar [Cu(dmp)BINAP]BF4 (4.9 mg, 0.02 mmol), unactivated alkenes (if solid at room temperature, 0.5 mmol) and benzoyl chloride B1 (30 µL, 0.25 mmol) were added. The vial was then sealed with a rubber septum and evacuatedbackfilled with N2 for three times. Then 4.3 mL of freshly distilled THF was added into the vial and the solution was purged with nitrogen for 7-10 min until the solution volume comes to around 4 mL. Then unactivated alkene (if liquid at room temperature, 0.5 mmol) was added into the solution under positive nitrogen atmosphere. Then the vial was irradiated with blue LED (λmax 455 nm) at room temperature for 24 h. After completion of the reaction (monitored by TLC analysis), the whole reaction mixture was diluted with DCM and transferred to a round-bottom flask. Following concentration in vacuo, the crude product was purified by column chromatography on silica gel (eluent: n-hexane and ethyl acetate in certain ratio as needed).