boron tribromide in dichloromethane 24 h; Ambient temperature;

N-chloro-succinimide; toluene-4-sulfonic acid in 1,4-dioxane 20 h; Heating;

1: 6 percent / diphenyl ether / 5 h / Heating 2: 65 percent / BBr3 / CH2Cl2 / 24 h / Ambient temperature View Scheme

1: 90 percent / SO2Cl2 / diethyl ether / 17 h / Ambient temperature 2: 6 percent / diphenyl ether / 5 h / Heating 3: 65 percent / BBr3 / CH2Cl2 / 24 h / Ambient temperature View Scheme

1: 76 percent / KOH / dimethylsulfoxide; H2O / 5 h / 100 - 110 °C 2: 11 percent / N-chlorosuccinimide, toluene-4-sulfonic acid / dioxane / 20 h / Heating View Scheme

1: 81 percent / boron trichloride / CH2Cl2 / 2 h / Ambient temperature 2: 11 percent / N-chlorosuccinimide, toluene-4-sulfonic acid / dioxane / 20 h / Heating View Scheme

1: 45 percent / KOH / dimethylsulfoxide; H2O / 5 h / 100 - 110 °C 2: 81 percent / boron trichloride / CH2Cl2 / 2 h / Ambient temperature 3: 11 percent / N-chlorosuccinimide, toluene-4-sulfonic acid / dioxane / 20 h / Heating View Scheme

1: 59 percent / trifluoroacetic anhydride / toluene / 1.) 0 deg C, 10 min, 2.) RT, 22 h 2: 45 percent / KOH / dimethylsulfoxide; H2O / 5 h / 100 - 110 °C 3: 81 percent / boron trichloride / CH2Cl2 / 2 h / Ambient temperature 4: 11 percent / N-chlorosuccinimide, toluene-4-sulfonic acid / dioxane / 20 h / Heating View Scheme

1: 93 percent / boron trichloride / CH2Cl2 / 3 h / Ambient temperature 2: 76 percent / KOH / dimethylsulfoxide; H2O / 5 h / 100 - 110 °C 3: 11 percent / N-chlorosuccinimide, toluene-4-sulfonic acid / dioxane / 20 h / Heating View Scheme

1: 87 percent / trifluoroacetic anhydride / toluene / 1.) 0 deg C, 10 min, 2.) RT, 22 h 2: 93 percent / boron trichloride / CH2Cl2 / 3 h / Ambient temperature 3: 76 percent / KOH / dimethylsulfoxide; H2O / 5 h / 100 - 110 °C 4: 11 percent / N-chlorosuccinimide, toluene-4-sulfonic acid / dioxane / 20 h / Heating View Scheme