1: sodium hydride; copper; copper(II) sulfate / N,N-dimethyl-formamide; mineral oil / 0 - 100 °C 2: 3-chloro-benzenecarboperoxoic acid / dichloromethane / 0 - 20 °C 3: 5 h / Reflux 4: sodium hydroxide; water / methanol / 1 h / 0 - 20 °C 5: manganese(IV) oxide / dichloromethane / 0 - 20 °C View Scheme

1: sodium hydride; copper; copper(II) sulfate / N,N-dimethyl-formamide; mineral oil / 0 - 100 °C 2: 3-chloro-benzenecarboperoxoic acid / dichloromethane / 0 - 20 °C 3: 5 h / Reflux 4: sodium hydroxide; water / methanol / 1 h / 0 - 20 °C View Scheme