1: Jacobsen's (S,S)-(salen)Co(III) catalyst; water; acetic acid / tetrahydrofuran / 20 h / Cooling with ice 2: lithium aluminium tetrahydride / tetrahydrofuran / 1 h / 0 °C View Scheme

3-chloro-benzenecarboperoxoic acid in dichloromethane T=0 - 20°C; 24 h;