1: 83 percent / K2CO3 / acetone / 84 h / Heating 2: 67 percent / KMnO4 / acetone; H2O / 20 h / 50 °C 3: SOCl2 / 3 h / Heating 4: 1.) ethanol, Mg; / 1.) toluene, CCl4, reflux, 3 h, 2.) reflux, 3 h; 5: 100 percent / H2SO4 / aq. acetic acid / 7 h / Heating 6: 94 percent / H2 / palladium-carbon catalyst / methanol View Scheme

1: 83 percent / K2CO3 / acetone / 84 h / Heating 2: 96 percent / hydroxylamine hydrochloride, HCOOH / 2 h / Heating View Scheme

1: 83 percent / K2CO3 / acetone / 84 h / Heating 2: 78 percent / p-toluenesulfonic acid monohydrate / benzene / 48 h / Heating 3: 96 percent / sodium acetate, H2 / PtO2 / ethyl acetate / 24 h / 2585.7 Torr View Scheme

1: 83 percent / K2CO3 / acetone / 84 h / Heating 2: 96 percent / hydroxylamine hydrochloride, HCOOH / 2 h / Heating 3: 88 percent / Fe powder, glacial acetic acid / propan-2-ol / 0.08 h / Heating 4: 73 percent / NaHCO3 / CHCl3 / 2 h / Heating 5: 11 percent / diethyl ether; dioxane / 4 h / Heating View Scheme

1: 83 percent / K2CO3 / acetone / 84 h / Heating 2: 67 percent / KMnO4 / acetone; H2O / 20 h / 50 °C 3: SOCl2 / 3 h / Heating 4: 1.) ethanol, Mg; / 1.) toluene, CCl4, reflux, 3 h, 2.) reflux, 3 h; 5: 100 percent / H2SO4 / aq. acetic acid / 7 h / Heating View Scheme

Multi-step reaction with 3 steps 1: 83 percent / K2CO3 / acetone / 84 h / Heating2: 96 percent / hydroxylamine hydrochloride, HCOOH / 2 h / Heating3: 88 percent / Fe powder, glacial acetic acid / propan-2-ol / 0.08 h / Heating  

Multi-step reaction with 4 steps 1: 83 percent / K2CO3 / acetone / 84 h / Heating2: 96 percent / hydroxylamine hydrochloride, HCOOH / 2 h / Heating3: 88 percent / Fe powder, glacial acetic acid / propan-2-ol / 0.08 h / Heating4: 73 percent / NaHCO3 / CHCl3 / 2 h / Heating  

Multi-step reaction with 8 steps 1: 83 percent / K2CO3 / acetone / 84 h / Heating2: 78 percent / p-toluenesulfonic acid monohydrate / benzene / 48 h / Heating3: 96 percent / sodium acetate, H2 / PtO2 / ethyl acetate / 24 h / 2585.7 Torr4: 57 percent / 2.) aq. NaOH / tetrahydrofuran / Ambient temperature; 1.) exothermic reaction, 2.)room temperature, 2 h;5: 85 percent / aq. HCl / acetone / 4 h / Ambient temperature6: 54 percent / NH3 / ethanol / 6 h / 130 °C7: 88 percent / tetrahydrofuran; diethyl ether / 1.) room temperature, 16 h, 2.) reflux, 2 h;8: 50 percent / KMnO4 / acetone / 96 h / Ambient temperature