1: CrO3, glacial CH3COOH / 18 h / Heating 2: 66 percent / SnCl2*2H2O / ethanol / 0.75 h / 70 °C 3: 1.) aq. HCl, NaMO2, 2.) NaN3 / 1.) 0 deg C to 5 deg C, 1 h, 2.) 15 min View Scheme

1: 16 percent / fuming HNO3 / 4.5 h / Ambient temperature 2: CH3COOH, H2SO4 / 18 h / Heating 3: CrO3, glacial CH3COOH / 18 h / Heating 4: 66 percent / SnCl2*2H2O / ethanol / 0.75 h / 70 °C 5: 1.) aq. HCl, NaMO2, 2.) NaN3 / 1.) 0 deg C to 5 deg C, 1 h, 2.) 15 min View Scheme

1: 66 percent / SnCl2*2H2O / ethanol / 0.75 h / 70 °C 2: 1.) aq. HCl, NaMO2, 2.) NaN3 / 1.) 0 deg C to 5 deg C, 1 h, 2.) 15 min View Scheme

1: CH3COOH, H2SO4 / 18 h / Heating 2: CrO3, glacial CH3COOH / 18 h / Heating 3: 66 percent / SnCl2*2H2O / ethanol / 0.75 h / 70 °C 4: 1.) aq. HCl, NaMO2, 2.) NaN3 / 1.) 0 deg C to 5 deg C, 1 h, 2.) 15 min View Scheme

hydrogenchloride; sodium azide 1.) 0 deg C to 5 deg C, 1 h, 2.) 15 min; Yield given. Multistep reaction;

air in dichloromethane UV-irradiation;