1: HCl gas, molecular sieves 4A / diethyl ether / -20 °C 2: 1.171 g / AcOH / 12 h / 55 °C 3: H2 / 10percent Pd/C / methanol / 1.25 h / Ambient temperature 4: 80 percent / mol. sieves / nitrobenzene; toluene / 36 h / 98 - 100 °C View Scheme