1: 1.) KNH2; 2.) KMnO4 / 1.) liquid NH3, 15 min; 2.) liquid NH3, 10 min 2: 80 percent / 80 percent aq. sulphuric acid / 50 h / Heating 3: 83 percent / fuming nitric acid, 20 percent oleum / 4 h / Heating 4: 44 percent / POCl3 / 8 h / Heating 5: 75 percent / NH3(g) / ethanol / 4 h / 110 °C / autoclave View Scheme

1: 80 percent / 80 percent aq. sulphuric acid / 50 h / Heating 2: 83 percent / fuming nitric acid, 20 percent oleum / 4 h / Heating 3: 44 percent / POCl3 / 8 h / Heating 4: 75 percent / NH3(g) / ethanol / 4 h / 110 °C / autoclave View Scheme

1: 83 percent / fuming nitric acid, 20 percent oleum / 4 h / Heating 2: 44 percent / POCl3 / 8 h / Heating 3: 75 percent / NH3(g) / ethanol / 4 h / 110 °C / autoclave View Scheme