1: 84 percent / K2CO3 2: 80 percent / NH2NH2; FeCl3; activated charcoal 3: 94 percent / HNO3; AcOH; Ac2O / urea / 50 - 60 °C 4: 96 percent / aq. NaOH / propan-2-ol / 80 °C 5: 60 percent / NH2NH2; FeCl3; activated charcoal / butan-1-ol / 17 h / 96 - 106 °C View Scheme

1: 92 percent / K2CO3 / dimethylformamide / 10 h / 145 - 150 °C 2: 95 percent / NH2NH2; FeCl3; activated charcoal / dioxane 3: 93 percent / chlorobenzene / 2 h / 90 - 95 °C 4: 94 percent / HNO3; AcOH; Ac2O / urea / 50 - 60 °C 5: 96 percent / aq. NaOH / propan-2-ol / 80 °C 6: 60 percent / NH2NH2; FeCl3; activated charcoal / butan-1-ol / 17 h / 96 - 106 °C View Scheme

1: KOH / dimethylformamide 2: hydrazine hydrate / Raney-nickel 3: 77.4 percent / acetic acid / 2 h / Ambient temperature 4: 82 percent / HNO3 / acetic acid / 2.5 h / 10 °C 5: 90 percent / 50percent HCl / 5 h / Heating 6: hydrazine hydrate / Raney-nickel / ethanol; tetrahydrofuran / Heating View Scheme

in ethanol Heating;