1.1: 84 percent / DIBAL-H / CH2Cl2; toluene / 4 h / -78 °C 2.1: 100 percent / NaBH4 / methanol / 0.75 h / 0 - 20 °C 3.1: 77 percent / triphenylphosphine; diethyl azodicarboxylate / tetrahydrofuran / 1 h / 0 - 20 °C 4.1: 95 percent / Mo7O24(NH4)6*4H2O; H2O2 / ethanol; H2O / 18 h / 20 °C 5.1: potassium hexamethyldisilazide / tetrahydrofuran; toluene / 0.5 h 5.2: 85 percent / tetrahydrofuran; toluene / -78 - 20 °C 6.1: 97 percent / 2,3-dichloro-5,6-dicyano-1,4-benzoquinone / H2O; CH2Cl2 / 2 h / 0 °C 7.1: DMSO; oxalyl chloride; Et3N / CH2Cl2 / 0.92 h / -78 °C 8.1: dibutylboron triflate; diisopropylethylamine / CH2Cl2 / 0.5 h / -78 °C 8.2: CH2Cl2 / 3 h / -78 - 20 °C 9.1: 12 mg / pyridine; chromium trioxide / CH2Cl2 / 0.33 h / 20 °C 10.1: 85 percent / HF / H2O; acetonitrile / 3 h / 20 °C 11.1: LiOH / H2O; 1,2-dimethoxy-ethane / 7 h / 80 °C View Scheme