Synthesis, characterization and application of Fe₃O₄@SiO₂@CPTMO@DEA‐SO₃H nanoparticles supported on bentonite nanoclay as a magnetic catalyst for the synthesis of 1,4‐dihydropyrano[2,3‐c]pyrazoles

Fe 3 O 4 nanoparticles were prepared and decorated on the surface of nanobentonite (NB), and subsequently modified by the organic and inorganic linkers and then sulfonic acid immobilization on the nanoparticles. The NB‐Fe 3 O 4 @SiO 2 @CPTMO@DEA‐SO 3 H catalyst was characterized via Fourier transform‐infrared spectroscopy, scanning electron microscopy, energy‐dispersive X‐ray spectroscopy, vibrating‐sample magnetometer, X‐ray diffraction...