boron tribromide in dichloromethane 1.) -70 deg C, 1 h, 2.) -70 to 10 deg C, 12 h;

boron tribromide in dichloromethane 0.0833333 h; Heating;

1: 39 percent / conc. HCl / acetic acid / 9 h / Heating 2: 87 percent / BBr3 / CH2Cl2 / 1.) -70 deg C, 1 h, 2.) -70 to 10 deg C, 12 h View Scheme

1: 48 percent / 2.) conc. HCl / acetic acid / 1.) 21 deg C, 12 h, 2.) reflux, 4 h 2: 0.4 mg / K2CO3 / acetone / 2 h / Heating 3: 87 percent / BBr3 / CH2Cl2 / 1.) -70 deg C, 1 h, 2.) -70 to 10 deg C, 12 h View Scheme

1: 0.4 mg / K2CO3 / acetone / 2 h / Heating 2: 87 percent / BBr3 / CH2Cl2 / 1.) -70 deg C, 1 h, 2.) -70 to 10 deg C, 12 h View Scheme