1: 85.3 percent / conc. H2SO4 / ethanol / 3 h / Ambient temperature 2: CrO3, H2SO4 / acetone / 0.5 h / Ambient temperature 3: NaHCO3 / dimethylsulfoxide / 8 h / Ambient temperature View Scheme

1: CrO3, H2SO4 / acetone / 0.5 h / Ambient temperature 2: NaHCO3 / dimethylsulfoxide / 8 h / Ambient temperature View Scheme

1: 91.2 percent / pyridine / Ambient temperature 2: 85.2 percent / NaH, Bu4NI / tetrahydrofuran / 24 h / Ambient temperature 3: 85.3 percent / conc. H2SO4 / ethanol / 3 h / Ambient temperature 4: CrO3, H2SO4 / acetone / 0.5 h / Ambient temperature 5: NaHCO3 / dimethylsulfoxide / 8 h / Ambient temperature View Scheme

1: 85.2 percent / NaH, Bu4NI / tetrahydrofuran / 24 h / Ambient temperature 2: 85.3 percent / conc. H2SO4 / ethanol / 3 h / Ambient temperature 3: CrO3, H2SO4 / acetone / 0.5 h / Ambient temperature 4: NaHCO3 / dimethylsulfoxide / 8 h / Ambient temperature View Scheme

sodium hydrogencarbonate in dimethyl sulfoxide 8 h; Ambient temperature; Yield given;