nickel dichloride; zinc in tetrahydrofuran Reduction;

hydrogenchloride 2 h; heating on the water bath;

1: 76 percent / H2O / 40 h / Heating 2: 73 percent / aq. NaNO2, 18percent HCl / methanol / 1 h / 0 - 5 °C 3: 70 percent / acetic anhydride / 0.5 h / heating on the water bath 4: 58 percent / 18percent HCl / 2 h / heating on the water bath View Scheme

1: 70 percent / acetic anhydride / 0.5 h / heating on the water bath 2: 58 percent / 18percent HCl / 2 h / heating on the water bath View Scheme