1.1: n-butyllithium; diisopropylamine / tetrahydrofuran; hexane / 1.5 h / -30 °C 1.2: 2 h / -30 °C 2.1: N,N-diethylaniline / 3 h / 215 °C / Inert atmosphere 3.1: AlCl3, aluminium chloride; N,N-diethylaniline / dichloromethane / -10 - 0 °C 4.1: 3-chloro-benzenecarboperoxoic acid / dichloromethane / 0 - 20 °C 4.2: 16 h / 20 °C 5.1: toluene-4-sulfonic acid / 2 h / 20 °C / Large scale reaction View Scheme

1.1: N,N-diethylaniline / 3 h / 215 °C / Inert atmosphere 2.1: AlCl3, aluminium chloride; N,N-diethylaniline / dichloromethane / -10 - 0 °C 3.1: 3-chloro-benzenecarboperoxoic acid / dichloromethane / 0 - 20 °C 3.2: 16 h / 20 °C 4.1: toluene-4-sulfonic acid / 2 h / 20 °C / Large scale reaction View Scheme

1.1: AlCl3, aluminium chloride; N,N-diethylaniline / dichloromethane / -10 - 0 °C 2.1: 3-chloro-benzenecarboperoxoic acid / dichloromethane / 0 - 20 °C 2.2: 16 h / 20 °C 3.1: toluene-4-sulfonic acid / 2 h / 20 °C / Large scale reaction View Scheme

1.1: sodium hydrogencarbonate; potassium iodide / acetonitrile / 12 h / 60 °C / Large scale reaction 2.1: potassium carbonate; potassium iodide / N,N-dimethyl-formamide / 3 h / 20 °C / Large scale reaction 3.1: n-butyllithium; diisopropylamine / tetrahydrofuran; hexane / 1.5 h / -30 °C 3.2: 2 h / -30 °C 4.1: N,N-diethylaniline / 3 h / 215 °C / Inert atmosphere 5.1: AlCl3, aluminium chloride; N,N-diethylaniline / dichloromethane / -10 - 0 °C 6.1: 3-chloro-benzenecarboperoxoic acid / dichloromethane / 0 - 20 °C 6.2: 16 h / 20 °C 7.1: toluene-4-sulfonic acid / 2 h / 20 °C / Large scale reaction View Scheme

1.1: potassium carbonate; potassium iodide / N,N-dimethyl-formamide / 3 h / 20 °C / Large scale reaction 2.1: n-butyllithium; diisopropylamine / tetrahydrofuran; hexane / 1.5 h / -30 °C 2.2: 2 h / -30 °C 3.1: N,N-diethylaniline / 3 h / 215 °C / Inert atmosphere 4.1: AlCl3, aluminium chloride; N,N-diethylaniline / dichloromethane / -10 - 0 °C 5.1: 3-chloro-benzenecarboperoxoic acid / dichloromethane / 0 - 20 °C 5.2: 16 h / 20 °C 6.1: toluene-4-sulfonic acid / 2 h / 20 °C / Large scale reaction View Scheme