hydrogenchloride 2 h; heating on the water bath;

1: 83 percent / H2O / 6 h / Heating 2: 82 percent / aq. NaNO2, glacial acetic acid / 1 h / 0 - 5 °C 3: 75 percent / acetic anhydride / 0.5 h / heating on the water bath 4: 45 percent / 18percent HCl / 2 h / heating on the water bath View Scheme

1: 82 percent / aq. NaNO2, glacial acetic acid / 1 h / 0 - 5 °C 2: 75 percent / acetic anhydride / 0.5 h / heating on the water bath 3: 45 percent / 18percent HCl / 2 h / heating on the water bath View Scheme

1: 75 percent / acetic anhydride / 0.5 h / heating on the water bath 2: 45 percent / 18percent HCl / 2 h / heating on the water bath View Scheme