Cu(ii) immobilized on poly(guanidine-sulfonamide)-functionalized Bentonite@MgFe 2 O 4 : a novel magnetic nanocatalyst for the synthesis of 1,4-dihydropyrano[2,3- c ]pyrazole

• Published in: RSC advances 2023-04, Vol.13 (16), p.10667-10680
• Main Authors: Alavinia, Sedigheh, Ghorbani-Vaghei, Ramin, Ghiai, Ramin, Gharehkhani, Alireza
• Format: Article
• Language: English
• ISSN: 2046-2069; 2046-2069
• DOI: 10.1039/d3ra00049d

In this paper, we aim at synthesizing a new nanocomposite material in which bentonite acts as a nucleation site for MgFe O nanoparticles precipitation in the attendance of an external magnetic field (MgFe O @Bentonite). Moreover, poly(guanidine-sulfonamide), as a novel kind of polysulfonamide, was immobilized on the surface of the prepared support (MgFe O @Bentonite@PGSA). Finally, an efficient and environment-friendly catalyst (containing nontoxic polysulfonamide, copper, and MgFe O @Bentonite) was prepared by anchoring a copper ion on the surface of MgFe O @Bentonite@PGSAMNPs. The synergic effect of MgFe O magnetic nanoparticles (MNPs), bentonite, PGSA, and copper species was observed while conducting the control reactions. The synthesized Bentonite@MgFe O @PGSA/Cu, which was characterized using energy-dispersive X-ray spectroscopy (EDAX), scanning electron microscopy (SEM), transmission electron microscopy (TEM), thermogravimetric analysis (TGA), X-ray diffraction (XRD), and Fourier-transform infrared (FT-IR) spectroscopy, was applied as a highly efficient heterogeneous catalyst to synthesize 1,4-dihydropyrano[2,3- ] pyrazole yielding up to 98% at 10 minutes. Excessive yield, quick reaction time, using water solvent, turning waste to wealth, and recyclability are the important advantages of the present work.