1: 57 percent / hydrogen / 10 percent Pd/C / ethyl acetate / 2585.7 Torr / Pd(OH)2/C 2: 92 percent / LAH / tetrahydrofuran / 0 °C 3: 90 percent / sat. aq. SO2 / 35 - 40 °C 4: 75 percent / hydrogen, Ba(OH)2*8H2O / Raney-Ni / H2O View Scheme