1: potassium carbonate, sodium iodide / ethanol / 4 h / Heating 2: aq. acetic acid, Zn / 65 °C 3: ethanol / 20 h / 25 °C 4: 16 percent / MnO2 / CHCl3 / 3.5 h 5: 30 percent / 48percent hydrobromic acid / 2 h / Ambient temperature View Scheme

1: ethanol / 20 h / 25 °C 2: 16 percent / MnO2 / CHCl3 / 3.5 h 3: 30 percent / 48percent hydrobromic acid / 2 h / Ambient temperature View Scheme

1: aq. acetic acid, Zn / 65 °C 2: ethanol / 20 h / 25 °C 3: 16 percent / MnO2 / CHCl3 / 3.5 h 4: 30 percent / 48percent hydrobromic acid / 2 h / Ambient temperature View Scheme

1: 16 percent / MnO2 / CHCl3 / 3.5 h 2: 30 percent / 48percent hydrobromic acid / 2 h / Ambient temperature View Scheme

hydrogen bromide 2 h; Ambient temperature;