diisobutylaluminium hydride in hexane; dichloromethane T=-78°C; 0.333333 h;

1.1: 26 percent / DIBAL / CH2Cl2; hexane / 0.33 h / -78 °C 2.1: n-BuLi / tetrahydrofuran; hexane / 0.25 h / -78 °C 2.2: 94 percent / tetrahydrofuran; hexane / -78 - 20 °C View Scheme