sodium 48 h; Heating;

1: 73 percent / aq. Ca(OH)2 / ethanol / 36 h / Ambient temperature 2: 74 percent / Na / 48 h / Heating View Scheme

1: 1.) n-BuLi / 1.) THF, n-hexane, from -70 to 5 deg C, 2.) THF, n-hexane, -65 deg C, 1 h 2: 73 percent / aq. Ca(OH)2 / ethanol / 36 h / Ambient temperature 3: 74 percent / Na / 48 h / Heating View Scheme