Abstract
Modification of acid-functionalized multiwalled carbon nanotubes (MWCNTs)-COOH with Fe3O4-CaO nanoparticles using FeSO4 and eggshell, produced an efficient magnetic catalyst for the synthesis of some C-glycosides. The condensation of dimedone with unprotected sugars in ethanol in the presence of a catalytic amount of (MWCNTs)-COOH/Fe3O4-CaO gave 3,4,5,6,7,9-hexahydro-1H-xanthene-1,8 (2H)-dione derivatives in good yields. The products were identified by CHN analysis, NMR, and FTIR spectra. Conversely, synthesis of Fe3O4-CaO nanoparticles and their conjugation on the surface of (MWCNTs)-COOH have been confirmed by FTIR, scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and energy-dispersive X-ray spectroscopy.
Graphical Abstract
![](/cms/asset/daed7452-145f-4086-8336-6dee23c75640/lsrt_a_2165684_uf0001_c.jpg)
Acknowledgments
The authors wish to thank Islamic Azad University in Qaemshahr Branch for the institutional support.
Disclosure statement
The authors have no conflict of interest to declare.