1: 1.) KOH 2: 80 percent / 1.) hydrazine, 2.) HCl / ethanol 3: AlCl3 / CH2Cl2 View Scheme

1: 1.) KOH 2: 80 percent / 1.) hydrazine, 2.) HCl / ethanol View Scheme

1: 1.) KOH 2: 80 percent / 1.) hydrazine, 2.) HCl / ethanol 3: AlCl3 / CH2Cl2 4: NaH / dimethylsulfoxide / 17 h / 100 °C 5: hydrazine / ethanol View Scheme

1: 1.) KOH 2: hydrazine / ethanol View Scheme

1: 58.1 g / KOH / tetrahydrofuran; methanol 2: 79 percent / 75percent aq. CH3COOH / 3 h / Heating 3: 30.9 g / 20percent aq. HCl / propan-1-ol / 7 h / Heating 4: 80 percent / 85percent hydrazine hydrate / ethanol / 7 h / Heating 5: 60 percent / MnO2 / dimethylformamide; dioxane / 1.) 90 deg C, overnight, 2.) 105 deg C, 4 h View Scheme

1: KOH / tetrahydrofuran; methanol 2: 75percent aq. CH3COOH / 3 h / Heating 3: 20percent aq. HCl / propan-1-ol / 7 h / Heating 4: 44 percent / 85percent hydrazine hydrate / ethanol / 7 h / Heating View Scheme