1: m-chloroperbenzoic acid (MCPBA) / CHCl3 / 0.05 h / 0 °C 2: 1.) p-toluenesulfonic acid (PTSA), 2.) PTSA / 1.) C6H6, DMF, 50 deg C, 19 h, 2.) C6H6, reflux, 2.5 h 3: 90.2 percent / p-toluenesulfonic acid monohydrate (PTSA) / benzene / 5 h / Heating 4: 0.4968 g / 35percent aq. H2O2, acetic acid / 1 h / 15 - 20 °C 5: 1.) p-toluenesulfonic acid (PTSA), 2.) PTSA / 1.) C6H6, DMF, 50 deg C, 24 h, 2.) C6H6, reflux, 2.5 h View Scheme

1: m-chloroperbenzoic acid (MCPBA) / CHCl3 / 0.05 h / 0 °C 2: 1.) p-toluenesulfonic acid (PTSA), 2.) PTSA / 1.) C6H6, DMF, 50 deg C, 19 h, 2.) C6H6, reflux, 2.5 h View Scheme

1: m-chloroperbenzoic acid (MCPBA) / CHCl3 / 0.05 h / 0 °C 2: 1.) p-toluenesulfonic acid (PTSA), 2.) PTSA / 1.) C6H6, DMF, 50 deg C, 19 h, 2.) C6H6, reflux, 2.5 h 3: 90.2 percent / p-toluenesulfonic acid monohydrate (PTSA) / benzene / 5 h / Heating View Scheme

With  3-chloro-benzenecarboperoxoic acid in  chloroform T=0°C; 0.05 h;