1: With anhydrous iron chloride in chlorobenzene T=60°C; 1 h; 2: With caesium carbonate in chlorobenzene T=100°C; 3 h; regioselective reaction;

hydrazine hydrate in diethyl ether 60 h; Ambient temperature;

1: 37 percent / benzene / 45 h / Heating 2: 100 percent / KOH / ethanol; H2O / 1.5 h / Heating 3: 63 percent / glacial acetic acid / 2 h / Heating 4: 36 percent / 100percent NH2NH2*H2O / diethyl ether / 60 h / Ambient temperature View Scheme