1: 2N HCl / acetone / 5 h / Heating 2: 80.6 percent / p-toluenesulfonic acid / 5 h / Heating View Scheme

1: 2N HCl / acetone / 5 h / Heating 2: 87 percent / p-toluenesulfonic acid / 17 h / Heating View Scheme

1: 2N HCl / acetone / 5 h / Heating 2: 87 percent / p-toluenesulfonic acid / 17 h / Heating 3: 95.8 percent / pyridine; ethanol / 22 h / Ambient temperature 4: 84.6 percent / 25percent (i-Bu)2AlH / benzene; hexane / 1.5 h / 0 - 5 °C 5: 77.9 percent / triethylamine / CH2Cl2 / 0.5 h 6: 57percent NaH / 1,2-dimethoxy-ethane / 18 h / Heating 7: 64.2 percent / KOH / H2O; methanol / 18 h / Heating 8: 84 percent / various solvent(s) / Heating 9: 90 percent / 2N HCl / acetone / 5 h / Heating 10: 94.9 percent / p-toluenesulfonic acid / 17 h / Heating View Scheme

hydrogenchloride in acetone