1: 61 percent / benzene / 24 h / Ambient temperature 2: 87 percent / 30percent H2O2 / methanol / 96 h / Ambient temperature 3: 75 percent / Et3N, Ac2O / CHCl3 / 1.5 h / Ambient temperature View Scheme

in benzene 24 h; Ambient temperature;

N-bromosuccinmide in tetrachloromethane 0.5 h; HeatingIrradiation;