sodium tetrahydroborate; calcium chloride in ethanol 1) -5 deg C, 2 h, 2) RT, 1 h; Yield given;

1: 1) 5percent aq. K2CO3, KMnO4, 2) 85percent hydrazine hydrate / 1) 90 deg C, 2 h, 2) 90 deg C 1 h 2: conc. H2SO4 / 20 h / Heating 3: NaBH4, CaCl2 / ethanol / 1) -5 deg C, 2 h, 2) RT, 1 h View Scheme

1: conc. H2SO4 / 20 h / Heating 2: NaBH4, CaCl2 / ethanol / 1) -5 deg C, 2 h, 2) RT, 1 h View Scheme