1: 78 percent / p-toluenesulfonic acid / 120 h / Heating 2: 81 percent / hydrazine hydrate / ethanol / 10 h / Heating 3: conc. hydrochloric acid, sodium nitrite / H2O; CHCl3 / -5 °C 4: CHCl3 / 50 °C 5: 70 percent / conc. hydrochloric acid / CHCl3 6: conc. hydrochloric acid, sodium nitrite / H2O / -6 °C 7: 70 percent / LiAlH4 / tetrahydrofuran / 24 h / Heating View Scheme