potassium carbonate; potassium iodide in acetone 24 h; Heating;

1: 90 percent / K2CO3, KI / butan-2-one / 24 h / Heating 2: 33 percent / NaH / dimethylformamide / 4 h / 50 - 60 °C 3: 24 percent / 5 h / 210 °C 4: 52 percent / BBr3 / CH2Cl2 / 0.5 h / -78 - -45 °C 5: 60 percent / K2CO3, KI / acetone / 24 h / Heating View Scheme

1: 33 percent / NaH / dimethylformamide / 4 h / 50 - 60 °C 2: 24 percent / 5 h / 210 °C 3: 52 percent / BBr3 / CH2Cl2 / 0.5 h / -78 - -45 °C 4: 60 percent / K2CO3, KI / acetone / 24 h / Heating View Scheme

1: 52 percent / BBr3 / CH2Cl2 / 0.5 h / -78 - -45 °C 2: 60 percent / K2CO3, KI / acetone / 24 h / Heating View Scheme

1: 24 percent / 5 h / 210 °C 2: 52 percent / BBr3 / CH2Cl2 / 0.5 h / -78 - -45 °C 3: 60 percent / K2CO3, KI / acetone / 24 h / Heating View Scheme