1: 97 percent / Zn powder, aq. 1N HCl, AcOH / 48 h / 0 °C 2: 1) 1N aq. LiOH, 2) Amberlite IR-120 / 1) THF, room temperature, 2) H2O, room temperature, 15 h View Scheme

1: 97 percent / Zn powder, aq. 1N HCl, AcOH / 48 h / 0 °C 2: 94 percent / acetonitrile / 2 h / Ambient temperature 3: 90 percent / 1 M aq. H2O2, 1 M aq. LiOH / tetrahydrofuran / 1 h / 0 °C View Scheme