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

MnI2 in tetrahydrofuran; diethyl ether T=-80°C; 4 h;