4,4-bipyridinium sulfonic acid chloride {[SO3H-4,4-bipyridine-SO3H]Cl2}, as a new solid acid, was synthesized and fully characterized by fourier transform infrared spectroscopy (FT-IR), X-ray diffraction analysis (XRD), scanning electron microscope (SEM), Energy-dispersive X-ray spectroscopy (EDX), thermal gravimetric analysis (TGA), 1H NMR and 13C NMR as well as mass spectra. [SO3H-4,4-bipyridine- SO3H]Cl2 was successfully applied as a new and efficient catalyst for the preparation of amidoalkyl phenols and bis amidoalkyl phenols as a new category of compounds at 110 ◦C under solvent-free conditions.
