sulfuric acid 24 h; Heating;

1: 93 percent / 20percent H2SO4 / 24 h / Heating 2: 1.) cc.HCl, NaNO2; 2.) NaN3 / 1.) 0 deg C, 1 h; 2.) 0 deg C, 1 h 3: 75 percent / o-dichlorobenzene / 5 h / 180 °C View Scheme