1.1: (COCl)2; DMSO / CH2Cl2 / 1 h / -60 - -40 °C 1.2: 94.9 percent / Et3N / CH2Cl2 / 1 h / 20 °C 2.1: 91.7 percent / CH2Cl2 / 4 h / Heating 3.1: 87.3 percent / LiAlH4 / tetrahydrofuran / 4 h / Heating 4.1: Et3N; MsCl / CH2Cl2 / 1.5 h / -40 °C 4.2: 95.5 percent / LiBr / tetrahydrofuran; CH2Cl2 / 2.5 h / 0 °C 5.1: BuLi; HMPA / tetrahydrofuran; hexane / 1 h / -70 °C 5.2: 85.3 percent / tetrahydrofuran; hexane / 2 h / -70 - 0 °C 6.1: 99.8 percent / sodium naphthalenide / tetrahydrofuran / 1 h / -78 °C 7.1: 93 percent / aq. HCl; air / methanol; hexane / 4 h / 40 °C View Scheme