1: 40 percent / HNO3, NaNO2 / H2O / <20 deg C 2: HNO3, H2SO4 / 2 h / Heating 3: 26.7 g / POCl3 / 2 h / Heating 4: N2H4*H2O / ethanol / 1.) 0 deg C, 0.75 h, 2.) 25 deg C, 3.5 h 5: H2 / 5percent Pd/C / aq. ethanol 6: conc. HCl / 2.5 h 7: MnO2, 5 M NaOH / H2O / 0.83 h / pH 6 View Scheme

1: H2 / PtO2 / acetic acid / 2068.6 Torr 2: 40 percent / HNO3, NaNO2 / H2O / <20 deg C 3: HNO3, H2SO4 / 2 h / Heating 4: 26.7 g / POCl3 / 2 h / Heating 5: N2H4*H2O / ethanol / 1.) 0 deg C, 0.75 h, 2.) 25 deg C, 3.5 h 6: H2 / 5percent Pd/C / aq. ethanol 7: conc. HCl / 2.5 h 8: MnO2, 5 M NaOH / H2O / 0.83 h / pH 6 View Scheme

1: 26.7 g / POCl3 / 2 h / Heating 2: N2H4*H2O / ethanol / 1.) 0 deg C, 0.75 h, 2.) 25 deg C, 3.5 h 3: H2 / 5percent Pd/C / aq. ethanol 4: conc. HCl / 2.5 h 5: MnO2, 5 M NaOH / H2O / 0.83 h / pH 6 View Scheme

1: HNO3, H2SO4 / 2 h / Heating 2: 26.7 g / POCl3 / 2 h / Heating 3: N2H4*H2O / ethanol / 1.) 0 deg C, 0.75 h, 2.) 25 deg C, 3.5 h 4: H2 / 5percent Pd/C / aq. ethanol 5: conc. HCl / 2.5 h 6: MnO2, 5 M NaOH / H2O / 0.83 h / pH 6 View Scheme

1: N2H4*H2O / ethanol / 1.) 0 deg C, 0.75 h, 2.) 25 deg C, 3.5 h 2: H2 / 5percent Pd/C / aq. ethanol 3: conc. HCl / 2.5 h 4: MnO2, 5 M NaOH / H2O / 0.83 h / pH 6 View Scheme