1: 3-chloro-benzenecarboperoxoic acid / dichloromethane 2: water; acetic acid / Co-salen / tetrahydrofuran / 24 h / 0 - 20 °C / Resolution of racemate 3: ammonium chloride / water; methanol / 3 h / 50 °C 4: sodium hydroxide; dihydrogen peroxide / water; methanol / 6 h / 20 - 70 °C / Reflux View Scheme

ruthenium trichloride; sodium periodate in water; acetonitrile T=16 - 38°C; 4 h;