1: benzene / 2 h / Ambient temperature 2: AlCl3 / various solvent(s) / 20 h / Ambient temperature 3: 1 N NaOH / ethanol; H2O / 0.17 h / Heating 4: hydrazine hydrate, NaOCH3 / 2-methoxy-ethanol / 1.) from 60 deg C to 150 deg C, 2.) 150 deg C, 1 h View Scheme

1: pyridine hydrochloride / 3 h / 180 °C 2: NaOH, KOH / butan-1-ol / 24 h / Heating View Scheme