1: 91 percent / 1.2 N diisobutylaluminiumhydride / hexane; toluene / 1 h / 0 °C 2: 95 percent / Ti(OiPr)4, diethyl-(-)-D-tartrate, 4.1 N t-butylhydroperoxide / CH2Cl2; 1,2-dichloro-ethane / 96 h / -30 °C View Scheme