3-chloro-benzenecarboperoxoic acid in dichloromethane 2.5 h; Ambient temperature;

1: 70 percent / manganese(II) iodide / diethyl ether; tetrahydrofuran / 4 h / -80 °C 2: 67 percent / m-chloroperbenzoic acid / CH2Cl2 / 2.5 h / Ambient temperature View Scheme

1: 76 percent / thionyl chloride / 2 h / Heating 2: 70 percent / manganese(II) iodide / diethyl ether; tetrahydrofuran / 4 h / -80 °C 3: 67 percent / m-chloroperbenzoic acid / CH2Cl2 / 2.5 h / Ambient temperature View Scheme

1: 98 percent / ethanolic KOH / 0.25 h / Ambient temperature 2: 76 percent / thionyl chloride / 2 h / Heating 3: 70 percent / manganese(II) iodide / diethyl ether; tetrahydrofuran / 4 h / -80 °C 4: 67 percent / m-chloroperbenzoic acid / CH2Cl2 / 2.5 h / Ambient temperature View Scheme