1.1: 81 percent / NaBH4 / ethanol; H2O / 16 h / -8 °C 2.1: BuLi / hexane; tetrahydrofuran / 1 h / -78 °C 2.2: 82 percent / hexane; tetrahydrofuran / 13 h / -10 - 20 °C View Scheme