Diisobutylaluminium hydride(1 M solution in tetrahydrofuran, 4.9 mL, 4.9 mmol); Sodium potassium tartrate 1.) hexane, CH2Cl2, -78 deg C, 5 h, 2.) hexane, CH2Cl2, methanol; Yield given. Multistep reaction;

Diisobutylaluminium hydride(1 M solution in tetrahydrofuran, 4.9 mL, 4.9 mmol); Sodium potassium tartrate 1.) hexane, CH2Cl2, -78 deg C, 5 h, 2.) hexane, CH2Cl2, methanol; Yield given. Multistep reaction;