1: 99 percent / LiAlH4 / tetrahydrofuran / 2.67 h 2: 86 percent / PPh3; CBr4 / CH2Cl2 / 14 h / 20 °C 3: 98 percent / BBr3 / CH2Cl2 / 6.75 h / -78 - 20 °C 4: 37.5 percent / MgSO4; BF3*Et2O / CH2Cl2 / 2.5 h / 0 °C 5: 47 percent / LiAlH4 / tetrahydrofuran / 1 h / 20 °C View Scheme

1: 99 percent / LiAlH4 / tetrahydrofuran / 2.67 h 2: 86 percent / PPh3; CBr4 / CH2Cl2 / 14 h / 20 °C 3: 98 percent / BBr3 / CH2Cl2 / 6.75 h / -78 - 20 °C View Scheme