1: 45 percent / Na2HPO4, Na/Hg / methanol / 0.75 h / 0 °C 2: 40 percent / Na/Hg / methanol / 48 h / 25 °C 3: 65 percent / CsF / tetrahydrofuran / 3 h / Heating View Scheme

With  disodium hydrogenphosphate; sodium amalgam; sodium; mercury in  methanol T=0°C; 0.75 h;