1.1: 89 percent / Na; NpH / 1,2-dimethoxy-ethane / -56 °C 2.1: H2O; methanol / 0.5 h / 20 °C 2.2: 84 percent / NaBH4 / 1 h / 20 °C View Scheme

NpH; sodium in ethylene glycol dimethyl ether T=-56°C;