Carla Boga, Anna Corradi Bonamartini, Luciano Forlani, Elisabetta Mezzina, Andrea Pompa, Paolo Sgarabotto, Domenico Spinelli and Paolo E. Todesco
C–H and N–H tautomers of the title compound are obtained and their structural properties determined by 1H and 13C NMR spectroscopy and X-ray diffraction; solvent and base effects on the rate of the C–H to N–H transformation are investigated.