hydrogenchloride; hydrazine hydrate in ethanol 1.) reflux, 5 h; 2.) pH=4.0, reflux, 2 h;

1: 85 percent / K2CO3 / various solvent(s) / 6 h / Heating 2: 1.) 100 percent hydrazine hydrate, 2.) 10 percent aq. HCl / 1.) EtOH, reflux, 4 h, 2.) EtOH, reflux, 2 h View Scheme

in acetic acid

in chloroform