potassium hydroxide; hydrazine 1.) EtOH, reflux, 5 h; 2.) 180 deg C, 1 h; Yield given. Multistep reaction;

1: 1.) ZnCl2 / 1.) Et2O, reflux, 3 h, 2.) benzene, r.t., overnight 2: 98percent hydrazine hydrate / ethanol / 5 h / Heating 3: KOH / 1 h / 180 °C View Scheme

1: 92 percent / SOCl2 / 5 h / Heating 2: 90 percent / ZnCl2 / benzene / 12 h / Ambient temperature 3: 1.) NH2NH2; 2.) KOH / 1.) EtOH, reflux, 5 h; 2.) 180 deg C, 1 h View Scheme

potassium in tetrahydrofuran 24 h; Ambient temperature;