1: 1 N HCl / 3 h / Heating 2: 80 percent / H2NNH2*2HCl / H2O / 16 h / Ambient temperature 3: 73 percent / 25percent NaOH / H2O / 0.5 h / Ambient temperature View Scheme

1: 1 N HCl / 3 h / Heating 2: 80 percent / H2NNH2*2HCl / H2O / 16 h / Ambient temperature 3: 1.) n-BuLi / 1.) THF, hexane, -20 deg C, 30 min, 2.) THF, room temp., 2 h; reflux, 1 h View Scheme

1: 1 N HCl / 3 h / Heating 2: 71 percent / NH2OH*HCl / H2O / 1.) room temp., 16 h, 2.) reflux, 4 h View Scheme