1.1: 96 percent / TEA / CH2Cl2 2.1: 92 percent / NBS / tetrahydrofuran / 20 °C 3.1: DIBAL-H / CH2Cl2 / -78 °C 4.1: LHMDS / tetrahydrofuran / 0.5 h / 0 °C 4.2: 368 mg / tetrahydrofuran / 20 °C 5.1: DIBAL-H / CH2Cl2 / 2 h / -78 °C 6.1: 910 mg / imidazole / CH2Cl2 / 2 h / Heating 7.1: n-BuLi / tetrahydrofuran; hexane / 0.5 h / -78 °C 7.2: tetrahydrofuran; hexane / 1 h / -78 °C 8.1: 98 mg / aq. oxalic acid / tetrahydrofuran / 0.17 h 9.1: toluene / 3.5 h / 110 °C 9.2: 64 percent / air / toluene / 2 h / 20 °C 10.1: 65 percent / 4A molecular sieves; TBAF / tetrahydrofuran / 0.5 h / 0 °C View Scheme