1.1: t-BuLi; HMPA / tetrahydrofuran / -78 °C 1.2: tetrahydrofuran 2.1: t-BuLi; HMPA / tetrahydrofuran / -78 °C 2.2: tetrahydrofuran 3.1: 93 percent / LiAlH4 / tetrahydrofuran / Heating 4.1: 95 percent / aq. HCl 5.1: 42 percent / BF3*OEt2 / 90 °C 6.1: 39 percent / hydrogen / Raney nickel / ethanol / Heating 7.1: 64 percent / BF3*OEt2 / 90 °C 8.1: 43 percent / hydrogen / Raney nickel / ethanol / Heating View Scheme