1: 17.0 g / potassium nitrate, conc. sulfuric acid / 2.5 h / Ambient temperature 2: 62 percent / PCl5 / POCl3 / 4 h / Heating 3: 0.79 g / sodium azide / ethanol / 17 h / Heating 4: 1.29 g / AcOH, 30 percent H2O2 / 16 h / 85 °C 5: KNO3, conc. H2SO4 / 34 h / 50 °C View Scheme

1: 0.79 g / sodium azide / ethanol / 17 h / Heating 2: 1.29 g / AcOH, 30 percent H2O2 / 16 h / 85 °C 3: KNO3, conc. H2SO4 / 34 h / 50 °C View Scheme

1: 62 percent / PCl5 / POCl3 / 4 h / Heating 2: 0.79 g / sodium azide / ethanol / 17 h / Heating 3: 1.29 g / AcOH, 30 percent H2O2 / 16 h / 85 °C 4: KNO3, conc. H2SO4 / 34 h / 50 °C View Scheme

sulfuric acid; potassium nitrate T=50°C; 34 h;

1: 1.29 g / AcOH, 30 percent H2O2 / 16 h / 85 °C 2: KNO3, conc. H2SO4 / 34 h / 50 °C View Scheme

thionyl chloride; N,N-dimethyl-formamide in 1,2-dichloro-ethane 0.5 h; Reflux;