1: 80 percent / NaBH4 / methanol / 30 h / 0 °C 2: 100 percent / formic acid / methanol; H2O / 0.5 h / Heating 3: 77 percent / 28percent aq. NH3, ferrous sulfate heptahydrate / methanol / 0.5 h / Heating 4: 35 percent / conc. H2SO4 / -10 °C 5: 30 percent / BBr3 / CH2Cl2 / 4 h / Ambient temperature View Scheme