1.1: bis(cyclopentadienyl)zirconium chloride hydride / benzene / 12 h / 40 °C 1.2: 65 percent / iodine / benzene / 0.08 h / 20 °C 2.1: 92 percent / TBAF / tetrahydrofuran / 0.5 h / 20 °C 3.1: isopropyl D-tartrate; titanium isopropoxide; tert-butylhydroperoxide / CH2Cl2 / 2 h / -20 °C 4.1: 82 percent / triethylamine; sulfur trioxide pyridine complex / CH2Cl2; dimethylsulfoxide / 1 h / 0 °C 5.1: t-butyllithium / diethyl ether; pentane / 0.5 h / -78 °C 5.2: 51 percent / TMEDA / diethyl ether; pentane / 0.08 h / -78 °C 6.1: 90 percent / Dess-Martin periodinane; sodium bicarbonate / CH2Cl2 / 1 h / 20 °C 7.1: TBAF / tetrahydrofuran / 0.5 h / 0 °C 8.1: 25 mg / HCl / 2-methyl-butan-2-ol / 2 h / 20 °C 9.1: 83 percent / imidazole / dimethylformamide / 2 h / 20 °C 10.1: 87 percent / DDQ / CH2Cl2; H2O / 0.5 h / 20 °C 11.1: 81 percent / pyridine / CH2Cl2 / 0.17 h / -78 °C 12.1: 9-BBN / tetrahydrofuran / 2 h / 40 °C 12.2: 37 percent / thallium carbonate; triphenylarsine / [1,1'-bis(diphenylphosphino)ferrocene]dichloropalladium(II) / tetrahydrofuran; dimethylformamide; H2O / 12 h / 20 °C 13.1: 78 percent / TBAF / tetrahydrofuran / 0.5 h / 0 °C View Scheme