sodium in methanol 2.5 h;

1: 1) n-butyllithium / 1) THF, hexane, -78 deg C, 0,5h 2: 86 percent / hydrazine hydrate / ethanol / 2 h / Heating 3: 96 percent / Na / methanol / 2.5 h View Scheme

1: 86 percent / hydrazine hydrate / ethanol / 2 h / Heating 2: 96 percent / Na / methanol / 2.5 h View Scheme