1: 94 percent / methanesulfonic acid / 1 h / 70 °C / other reagent: polyphosphoric acid 2: 75 percent / p-toluenesulfonic acid monohydrate, chloranil / benzene / 15 h / Ambient temperature; other reagent: benzoquinone 3: 65 percent / lithium diisopropylamide / tetrahydrofuran; hexane / 1.) -50 deg C, 2 h, 2.) room temperature, 3 h 4: 74 percent / m-chloroperbenzoic acid / CH2Cl2 / 24 h / Ambient temperature View Scheme

1: 94 percent / methanesulfonic acid / 1 h / 70 °C / other reagent: polyphosphoric acid 2: 75 percent / p-toluenesulfonic acid monohydrate, chloranil / benzene / 15 h / Ambient temperature; other reagent: benzoquinone 3: 98 percent / m-chloroperbenzoic acid / CH2Cl2 / 4 h / Ambient temperature 4: 62 percent / triethylamine / acetonitrile / 3 h / Heating 5: 2.) HCl / 1.) THF, hexane, -50 deg C, 25 min, 2.) methanol, reflux, 5 min 6: 85 percent / AlCl3 / benzene / 2 h / Ambient temperature View Scheme

1: 94 percent / methanesulfonic acid / 1 h / 70 °C / other reagent: polyphosphoric acid 2: 75 percent / p-toluenesulfonic acid monohydrate, chloranil / benzene / 15 h / Ambient temperature; other reagent: benzoquinone 3: 65 percent / lithium diisopropylamide / tetrahydrofuran; hexane / 1.) -50 deg C, 2 h, 2.) room temperature, 3 h 4: 74 percent / m-chloroperbenzoic acid / CH2Cl2 / 24 h / Ambient temperature 5: 61 percent / triethylamine / acetonitrile / 5 h / 70 °C 6: 97 percent / KOH / acetonitrile; H2O / 14 h / Ambient temperature 7: 90 percent / HCl / CH2Cl2 / 1.) room temperature, 24 h, 2.) reflux, 10 h View Scheme