LAUSR

Abstract A magnetically supported ionic liquid, guanidinium hydrogen sulfate on Fe3O4 nanoparticles, has been synthesized and evaluated as a recoverable and efficient catalyst for the one-pot synthesis of spiro [pyrazole-pyrazolo [3,4-b]pyridine]-dione derivatives via the reaction of 3-amino-1-phenyl-2-pyrazolin-5-one with aryl aldehydes in good yields under mild experimental conditions. The magnetic catalyst could be separated from the reaction mixture with the assistance of an external magnet. The catalyst was characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscope (SEM) and energy-dispersive X-ray spectroscopy (EDS). Furthermore, the structures of the new compounds were fully characterized by their spectral data IR, 1H NMR, and 13C NMR.