boron tribromide in dichloromethane 1.) -78 deg C, 15 min, 2.) from -78 deg C to RT, 2.5 h;

1: 99 percent / H2 / 20percent palladium hydroxide / ethanol / 2280 Torr 2: 41 percent / TiCl4 / CH2Cl2 / 1.5 h / Ambient temperature 3: 76 percent / BBr3 / CH2Cl2 / 1.) -78 deg C, 15 min, 2.) from -78 deg C to RT, 2.5 h View Scheme

1: AcONa / methanol / 1.5 h / Heating 2: 99 percent / H2 / 20percent palladium hydroxide / ethanol / 2280 Torr 3: 41 percent / TiCl4 / CH2Cl2 / 1.5 h / Ambient temperature 4: 76 percent / BBr3 / CH2Cl2 / 1.) -78 deg C, 15 min, 2.) from -78 deg C to RT, 2.5 h View Scheme

1: BCl3, AlCl3 / CH2Cl2; 1,2-dichloro-ethane / 2.5 h 2: AcONa / methanol / 1.5 h / Heating 3: 99 percent / H2 / 20percent palladium hydroxide / ethanol / 2280 Torr 4: 41 percent / TiCl4 / CH2Cl2 / 1.5 h / Ambient temperature 5: 76 percent / BBr3 / CH2Cl2 / 1.) -78 deg C, 15 min, 2.) from -78 deg C to RT, 2.5 h View Scheme

1: 41 percent / TiCl4 / CH2Cl2 / 1.5 h / Ambient temperature 2: 76 percent / BBr3 / CH2Cl2 / 1.) -78 deg C, 15 min, 2.) from -78 deg C to RT, 2.5 h View Scheme