1: m-chloroperbenzoic acid (m0CPBA) 2: 100 percent / Al2O3 / diethyl ether; methanol 3: various solvent(s) / 1.5 h / 140 °C 4: CH2Cl2 5: 60 percent / benzene / 1 h / 45 °C View Scheme

With  3-chloro-benzenecarboperoxoic acid in  dichloromethane  Ambient temperature;   

Multi-step reaction with 3 steps 1: m-chloroperbenzoic acid (m0CPBA)2: 100 percent / Al2O3 / diethyl ether; methanol3: various solvent(s) / 1.5 h / 140 °C