1: HCl gas / 24 h / 0 °C 2: 0.5 N aq. HCl / ethanol / 48 h / 0 °C 3: 6 N aq. HCl / 10 h / Heating 4: H2, 3 N aq. HCl / 20percent Pd(OH)2/C / methanol / 15 h / Ambient temperature View Scheme
1: CH2Cl2 / 24 h / -65 °C 2: Et3N / CH2Cl2 / 24 h / Ambient temperature 3: HCl gas / 24 h / 0 °C 4: 0.5 N aq. HCl / ethanol / 48 h / 0 °C 5: 6 N aq. HCl / 10 h / Heating 6: H2, 3 N aq. HCl / 20percent Pd(OH)2/C / methanol / 15 h / Ambient temperature View Scheme