The reaction mixture was stirred at room temperature with Kessil lamps (440 nm). It should be noted that chloroform can be used from commercially sealed-cap bottle under inert atmosphere or it is recommended to conduct three cycles of Freeze-Pump-Thaw for other sources of chloroform before use. The reaction was monitored by NMR with CH2Br2 as internal standard. NMR yield was determined by integration of ArCH NMR of products.