manganese(IV) oxide in dichloromethane T=20°C; 15 h;

1: caesium carbonate / N,N-dimethyl-formamide / 0 - 90 °C 2: sodium hydride; copper; copper(II) sulfate / N,N-dimethyl-formamide; mineral oil / 0 - 100 °C 3: 3-chloro-benzenecarboperoxoic acid / dichloromethane / 0 - 20 °C 4: 5 h / Reflux 5: sodium hydroxide; water / methanol / 1 h / 0 - 20 °C 6: manganese(IV) oxide / dichloromethane / 0 - 20 °C View Scheme

1.1: potassium carbonate / water / 0.5 h / 20 °C 1.2: 4 h / 20 °C 2.1: caesium carbonate / N,N-dimethyl-formamide / 0 - 90 °C 3.1: sodium hydride; copper; copper(II) sulfate / N,N-dimethyl-formamide; mineral oil / 0 - 100 °C 4.1: 3-chloro-benzenecarboperoxoic acid / dichloromethane / 0 - 20 °C 5.1: 5 h / Reflux 6.1: sodium hydroxide; water / methanol / 1 h / 0 - 20 °C 7.1: manganese(IV) oxide / dichloromethane / 0 - 20 °C View Scheme

1: 5 h / Reflux 2: sodium hydroxide; water / methanol / 1 h / 0 - 20 °C 3: manganese(IV) oxide / dichloromethane / 0 - 20 °C View Scheme

1: 3-chloro-benzenecarboperoxoic acid / dichloromethane / 0 - 20 °C 2: 5 h / Reflux 3: sodium hydroxide; water / methanol / 1 h / 0 - 20 °C 4: manganese(IV) oxide / dichloromethane / 0 - 20 °C View Scheme

1: sodium hydroxide; water / methanol / 1 h / 0 - 20 °C 2: 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 5: manganese(IV) oxide / dichloromethane / 0 - 20 °C View Scheme