1: 96 percent / aq. NaIO4 / methanol / 20 h / Ambient temperature 2: 97 percent / TFAA / benzene / 20 h / Ambient temperature 3: 74 percent / NaBH4, NiCl2*6H2O / methanol; tetrahydrofuran / 0.5 h / Ambient temperature 4: 100 percent / 10percent NaOH / ethanol / 4 h / Ambient temperature View Scheme

1: 96 percent / aq. NaIO4 / methanol / 20 h / Ambient temperature 2: 97 percent / TFAA / benzene / 20 h / Ambient temperature 3: 74 percent / NaBH4, NiCl2*6H2O / methanol; tetrahydrofuran / 0.5 h / Ambient temperature 4: 87 percent / tetrahydrofuran / 2 h / Heating View Scheme