1: 1.) LDA / 1.) THF, hexane -78 deg C, 0.5 h, 2.) a) -78 deg C, 1 h, b) from -78 deg C to 0 deg C, 2.5 h 2: 70 percent / LiAlH4 / tetrahydrofuran / 1.5 h / -78 - 0 °C View Scheme

Multi-step reaction with 2 steps 1: 1.) LDA / 1.) THF, hexane -78 deg C, 0.5 h, 2.) a) -78 deg C, 1 h, b) from -78 deg C to 0 deg C, 2.5 h2: 90 percent / LiAlH4 / tetrahydrofuran / 1.5 h / -78 - 0 °C