manganese(IV) oxide; n-butyllithium 1.) THF, hexane, 1 h, r.t.; 2.) CH2Cl2, 2 h; Yield given. Multistep reaction;

1: 1.) sodium hydride / 1.) THF, 30 min, rt; 2.) THF, 0 deg C, rt 2 h 2: 1.) diisobutylaluminium hydride; 2.) water/silicagel / 1.) hexane-pet.ether, -60 deg C, -20 deg C 1 h; 2.) hexane-pet.ether, rt 1h View Scheme

manganese(IV) oxide; n-butyllithium 1.) THF, hexane, 1 h, r.t.; 2.) CH2Cl2, 2 h; Yield given. Multistep reaction;