boron tribromide in dichloromethane 5 h; Ambient temperature;

hydrogenchloride; acetic acid 24 h; Heating;

1: 97 percent / CsF / Pd(PPh3)4 / 1,2-dimethoxy-ethane / 7 h / Heating 2: 80 percent / Me3SO3H / CHCl3 / 3 h / Ambient temperature 3: 96 percent / BBr3 / CH2Cl2 / 5 h / Ambient temperature View Scheme

1: 80 percent / Me3SO3H / CHCl3 / 3 h / Ambient temperature 2: 96 percent / BBr3 / CH2Cl2 / 5 h / Ambient temperature View Scheme

1: NaBH4 / tetrahydrofuran; methanol / 4.5 h 2: tosic acid / benzene / 1 h / Heating 3: 80 percent / I2 / benzene / 4 h / Heating 4: 2.97 g / p-toluenesulfonic acid / benzene / 24 h / Heating 5: 71 percent / DDQ / benzene 6: 85 percent / glacial acetic acid, concd. HCl / 24 h / Heating View Scheme

1: tosic acid / benzene / 1 h / Heating 2: 80 percent / I2 / benzene / 4 h / Heating 3: 2.97 g / p-toluenesulfonic acid / benzene / 24 h / Heating 4: 71 percent / DDQ / benzene 5: 85 percent / glacial acetic acid, concd. HCl / 24 h / Heating View Scheme

1: 80 percent / I2 / benzene / 4 h / Heating 2: 2.97 g / p-toluenesulfonic acid / benzene / 24 h / Heating 3: 71 percent / DDQ / benzene 4: 85 percent / glacial acetic acid, concd. HCl / 24 h / Heating View Scheme

1: 75.3 percent / triphenylcarbinol, CF3COOH / 48 h / Heating 2: NaBH4 / tetrahydrofuran; methanol / 4.5 h 3: tosic acid / benzene / 1 h / Heating 4: 80 percent / I2 / benzene / 4 h / Heating 5: 2.97 g / p-toluenesulfonic acid / benzene / 24 h / Heating 6: 71 percent / DDQ / benzene 7: 85 percent / glacial acetic acid, concd. HCl / 24 h / Heating View Scheme

1: 71 percent / DDQ / benzene 2: 85 percent / glacial acetic acid, concd. HCl / 24 h / Heating View Scheme

1: 2.97 g / p-toluenesulfonic acid / benzene / 24 h / Heating 2: 71 percent / DDQ / benzene 3: 85 percent / glacial acetic acid, concd. HCl / 24 h / Heating View Scheme