1: 1,5-diazabicyclo<4.3.0>non-5-ene / benzene / Heating 2: 95 percent / H2O, MeOH 3: 70 percent / NBS, (PhCO)2O2 / CCl4 / 1.5 h / Irradiation View Scheme

DBN in benzene Heating; Yield given. Yields of byproduct given;