boron trichloride in dichloromethane T=-10°C; 0.5 h;

1: 78 percent / mercuric oxide, iodine / diethyl ether / 24 h / Ambient temperature 2: 73 percent / copper bronze powder / 24 h / 200 - 210 °C 3: 40 percent / hydrobromic acid, hydroiodic acid / 144 h / Heating 4: 61 percent / potassium carbonate / acetone / 6 h 5: 49 percent / titanium(IV) chloride / CH2Cl2 / 1 h / -10 °C 6: 96 percent / sodium chlorite, resorcinol / dioxane / 24 h / pH 4.4 7: 78 percent / boron trichloride / CH2Cl2 / 0.5 h / -10 °C View Scheme

1: 73 percent / copper bronze powder / 24 h / 200 - 210 °C 2: 40 percent / hydrobromic acid, hydroiodic acid / 144 h / Heating 3: 61 percent / potassium carbonate / acetone / 6 h 4: 49 percent / titanium(IV) chloride / CH2Cl2 / 1 h / -10 °C 5: 96 percent / sodium chlorite, resorcinol / dioxane / 24 h / pH 4.4 6: 78 percent / boron trichloride / CH2Cl2 / 0.5 h / -10 °C View Scheme

1: 40 percent / hydrobromic acid, hydroiodic acid / 144 h / Heating 2: 61 percent / potassium carbonate / acetone / 6 h 3: 49 percent / titanium(IV) chloride / CH2Cl2 / 1 h / -10 °C 4: 96 percent / sodium chlorite, resorcinol / dioxane / 24 h / pH 4.4 5: 78 percent / boron trichloride / CH2Cl2 / 0.5 h / -10 °C View Scheme

1: 61 percent / potassium carbonate / acetone / 6 h 2: 49 percent / titanium(IV) chloride / CH2Cl2 / 1 h / -10 °C 3: 96 percent / sodium chlorite, resorcinol / dioxane / 24 h / pH 4.4 4: 78 percent / boron trichloride / CH2Cl2 / 0.5 h / -10 °C View Scheme

1: 49 percent / titanium(IV) chloride / CH2Cl2 / 1 h / -10 °C 2: 96 percent / sodium chlorite, resorcinol / dioxane / 24 h / pH 4.4 3: 78 percent / boron trichloride / CH2Cl2 / 0.5 h / -10 °C View Scheme

1: 96 percent / sodium chlorite, resorcinol / dioxane / 24 h / pH 4.4 2: 78 percent / boron trichloride / CH2Cl2 / 0.5 h / -10 °C View Scheme