sodium tetrahydroborate in methanol 0.5 h; Ambient temperature;

1: 83 percent / 98percent H2SO4 / benzene / 48 h / Heating 2: 62 percent / K2CO3 anhydr. / acetone / 2 h / Heating 3: 74 percent / Na / toluene; ethanol / 6 h / Heating 4: 10percent HCl / 2.5 h / Heating 5: 76 percent / sodium borohydride / methanol / 0.5 h / Ambient temperature View Scheme

1: 74 percent / Na / toluene; ethanol / 6 h / Heating 2: 10percent HCl / 2.5 h / Heating 3: 76 percent / sodium borohydride / methanol / 0.5 h / Ambient temperature View Scheme

1: 10percent HCl / 2.5 h / Heating 2: 76 percent / sodium borohydride / methanol / 0.5 h / Ambient temperature View Scheme

1: 62 percent / K2CO3 anhydr. / acetone / 2 h / Heating 2: 74 percent / Na / toluene; ethanol / 6 h / Heating 3: 10percent HCl / 2.5 h / Heating 4: 76 percent / sodium borohydride / methanol / 0.5 h / Ambient temperature View Scheme

phosphoric acid T=180°C; 18 h;