in benzene Ambient temperature;

1: 99 percent / ethanol / 15 h / Ambient temperature 2: 50 percent / 2 N HCl / methanol / 8 h / 77 - 79 °C 3: 70 percent / sodium borohydride, CoCl2 View Scheme

1: 99 percent / ethanol / 15 h / Ambient temperature 2: 50 percent / 2 N HCl / methanol / 8 h / 77 - 79 °C View Scheme