1: sodium periodate / H2O; methanol / 12 h / Ambient temperature 2: toluene / 2 h / Heating 3: 87 percent / 20percent aq. NaOH / dimethylsulfoxide / 3 h / 120 °C 4: oxalyl chloride, DMF / tetrahydrofuran / 2 h / Ambient temperature 5: pyridine / CH2Cl2 / 24 h / Ambient temperature 6: 54 percent / mercuric chloride, mercuric oxide / acetonitrile; H2O / 1 h / Heating 7: 93 percent / tetrahydrofuran / 0.5 h / -10 °C 8: 69 percent / manganese dioxide / CH2Cl2 / 24 h / Ambient temperature 9: 64 percent / N-bromosuccinimide / benzene / 1 h / Irradiation 10: 55 percent / tris(trimethylsilyl)silane, azoisobutyronitrile (AIBN) / toluene / 2 h / 85 °C 11: 36 percent / boron tribromide / CH2Cl2 / 1 h / -40 °C View Scheme