hydrogenchloride; hydrazine hydrate 1.) methanol, reflux, 1h; 2.) reflux, 1.5 h; Yield given. Multistep reaction;

1: 1.) hydrazine hydrate 2.)concentrated HCl / 1.) methanol, reflux, 1h; 2.) reflux, 1.5 h 2: 66 percent / benzene / Heating 3: 42 percent / butyllithium / tetrahydrofuran; hexane / 0.25 h / -100 - -95 °C View Scheme

in N,N-dimethyl-formamide T=90°C; 15 h;