ABSTRACT
Fe3O4-multiwalled carbon nanotube (MWCNT) nanoparticles were prepared by using Astragalus membranaceus root extract and characterised by all parameters. The synthesised Fe3O4−MWCNTs were used as a heterogeneous catalyst for the synthesis of diverse polyfunctionalised pyridines. Pyridines are important heterocyclic compounds in many natural products and pharmaceuticals with a wide range of biological and medicinal properties such as quinine, papaverine, emetine. TEM images showed that the Fe3O4 nanoparticles coated on the outer surface of the MWCNTs were arranged in consistent patterns. The mean diameters of Fe3O4 nanoparticles and MWCNTs were ~15 and ~25 nm, respectively. X-ray diffraction (XRD) analysis and Raman spectroscopic techniques revealed the degree of graphitisation. After preparation of pyridines in water with excellent yields, the nanocatalysts were recovered by an external magnet without filtration and reused for several runs without any significant loss of their activity.
Graphical Abstract
Acknowledgments
This work was supported by the [National Research Foundation of Korea #1] under Grant [2018R1A2B2004432]; [Priority Research Centers Program #2] under Grant [2014R1A6A1031189]; and [Nano Material Technology Development #3] under Grant [2012M3A7B4049675]
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIT) (2018R1A2B2004432) and the Priority Research Centers Program (2014R1A6A1031189). This research was supported by the Nano Material Technology Development Program of the Korean National Research Foundation (NRF) funded by the Korean Ministry of Education, Science, and Technology (2012M3A7B4049675).
Disclosure statement
No potential conflict of interest was reported by the authors.