3-chloro-benzenecarboperoxoic acid in dichloromethane T=20 - 25°C; 16 h;

1: 64 percent / Cl2, H2SO4 / 2 h / 0 °C 2: 96 percent / NaNO2, conc. HCl / 1) 0 to 5 deg C, 1 h, 2) 25 deg C, 2 h 3: m-chloroperbenzoic acid / CH2Cl2 / 16 h / 20 - 25 °C View Scheme

1: 96 percent / NaNO2, conc. HCl / 1) 0 to 5 deg C, 1 h, 2) 25 deg C, 2 h 2: m-chloroperbenzoic acid / CH2Cl2 / 16 h / 20 - 25 °C View Scheme

trifluoroacetic anhydride T=15 - 20°C; 2 h; Yield given;