1: sodium chromate / acetic acid; acetic anhydride / 72 h / 35 °C 2: lithium tri-tert-butoxyaluminohydride / tetrahydrofuran 3: boron trifluoride etherate / CH2Cl2 / -20 °C 4: 96 percent / lithium aluminum hydride View Scheme

sodium chromate(VI) in acetic anhydride; acetic acid T=35°C; 72 h; Yield given;