3-chloro-benzenecarboperoxoic acid in chloroform T=0 - 10°C; 1.5 h;

anhydrous magnesium perchlorate 6 h; Heating;

1: 1.) n-butyllithium / 1.) ether, hexane, -78 deg C, 45 min, 2.) ether, hexane, from -78 deg C to RT, overnight 2: 78 percent / m-chloroperbenzoic acid (MCPBA) / CHCl3 / 1.5 h / 0 - 10 °C View Scheme