1: 61 percent / 2M HCl / methanol / 1 h / Ambient temperature 2: 80 percent / Raney Ni / acetone; ethanol / 0.5 h / Ambient temperature View Scheme

1: 61 percent / 2M HCl / methanol / 1 h / Ambient temperature 2: 70 percent / 6M H2SO4 / methanol / 1 h / Heating View Scheme