NbCl 5 Functionalized Perlite: A Potent and Recyclable Catalyst for Synthesis of Pyrans.

Niobium pentachloride functionalised perlite was prepared via a solid state dispersion technique, which was utilized as an efficient heterogeneous catalyst for the synthesis of pyrans. The immobilisation of NbCl₅ over perlite was examined by Fourier-transform infrared (FT-IR) spectroscopy, X-ray diffraction (XRD), Thermogravimetric analysis (TGA), scanning electron microscope (SEM) with energy dispersive spectra (EDS), and Brunauer, Emmett and Teller (BET) surface area measurements. The wt% of NbCl₅-loaded perlite was optimized based on the adequacy with respect to the yield of the pyrans in various solvents. The recyclability of the catalyst was validated in synthesizing pyrans and the results marked its efficiency up to five runs. The efficacy of the NbCl₅/perlite catalyst was found to be comparable and better with respect to the other heterogeneous catalysts reported. The structures of pyrans were confirmed by FT-IR, ¹H and ¹³C NMR spectral techniques. The proposed recyclable heterogeneous NbCl₅/perlite catalyst simplifies the protocol, and has minimal chemical waste, a lower reaction time and a high-yield. [ABSTRACT FROM AUTHOR]