1: 76 percent / 1,2-dichloro-ethane / 2 h / Heating 2: 34 percent / HCl / methanol / 1 h / Heating 3: 69 percent / H2 / 5percent Pd/C / H2O / 1 h / 2250.2 Torr 4: 79 percent / 4 M HCl / 1 h / Heating View Scheme