1: 98 percent / HCL aq. / 2 h / 40 °C 2: 82 percent / Hg(OAc)2, EDTA 3: 89 percent / HClO4, H2 / Pd / ethanol / 6 h / 760 Torr / Ambient temperature View Scheme

1: 98 percent / HCL aq. / 2 h / 40 °C 2: 82 percent / Hg(OAc)2, EDTA 3: 89 percent / HClO4, H2 / Pd / ethanol / 6 h / 760 Torr / Ambient temperature 4: 1.) NH2NH2, 2.) KOH View Scheme