diisobutylaluminium hydride in hexane; dichloromethane T=-70°C; 5 h;

1: 1.) BuLi / 1.) hexane, THF, -70 deg C, 1 h; 2.) THF, r.t., overnight 2: 6.24 g / CH2Cl2; diethyl ether 3: 90 percent / DIBAH / CH2Cl2; hexane / 5 h / -70 °C View Scheme

1: 1.) BuLi / 1.) hexane, THF, -70 deg C, 1 h; 2.) THF, r.t., overnight 2: 6.24 g / CH2Cl2; diethyl ether 3: 90 percent / DIBAH / CH2Cl2; hexane / 5 h / -70 °C View Scheme