1: 90 percent / 85percent hydrazine hydrate / 10percent Pd/C / ethanol / 50 °C 2: 91 percent / 18 M H2SO4, NaNO2 / H2O / 0 - 5 °C 3: 89 percent / anhydrous K2CO3 / 48 h / Heating View Scheme

1: 60 percent / sodium methoxide / methanol / 24 h / Heating 2: 90 percent / 85percent hydrazine hydrate / 10percent Pd/C / ethanol / 50 °C 3: 91 percent / 18 M H2SO4, NaNO2 / H2O / 0 - 5 °C 4: 89 percent / anhydrous K2CO3 / 48 h / Heating View Scheme

1: 46.5 percent / 5.5percent HN3 / CHCl3 / 96 h / 120 °C 2: 85 percent / 18 M H2SO4, 13 M HNO3 / 1.5 h / 60 °C 3: 60 percent / sodium methoxide / methanol / 24 h / Heating 4: 90 percent / 85percent hydrazine hydrate / 10percent Pd/C / ethanol / 50 °C 5: 91 percent / 18 M H2SO4, NaNO2 / H2O / 0 - 5 °C 6: 89 percent / anhydrous K2CO3 / 48 h / Heating View Scheme

1: 85 percent / 18 M H2SO4, 13 M HNO3 / 1.5 h / 60 °C 2: 60 percent / sodium methoxide / methanol / 24 h / Heating 3: 90 percent / 85percent hydrazine hydrate / 10percent Pd/C / ethanol / 50 °C 4: 91 percent / 18 M H2SO4, NaNO2 / H2O / 0 - 5 °C 5: 89 percent / anhydrous K2CO3 / 48 h / Heating View Scheme

potassium carbonate 48 h; Heating;

1: 91 percent / 18 M H2SO4, NaNO2 / H2O / 0 - 5 °C 2: 89 percent / anhydrous K2CO3 / 48 h / Heating View Scheme