1: Na2S2O4 / ethyl acetate; H2O 2: 2M HCl / methanol / 1.25 h / 100 °C 3: 82 percent / NaIO3 / H2O; ethyl acetate / 0.25 h View Scheme

1: Na2S2O4 / ethyl acetate; H2O 2: 2M HCl / methanol / 1.25 h / 100 °C 3: 82 percent / NaIO3 / H2O; ethyl acetate / 0.25 h 4: 1M NaOH, H2 / Raney nickel / ethyl acetate / 5 h / 70 °C / 2067.2 Torr 5: NaIO4 / ethyl acetate; H2O / 0.17 h / Ambient temperature View Scheme