Nickel(II) Nanoparticles Immobilized on EDTA-Modified Fe3O4@SiO2 Nanospheres as Efficient and Recyclable Catalysts for Ligand-Free Suzuki–Miyaura Coupling of Aryl Carbamates and Sulfamates
2020
A highly
efficient and air-, thermal-, and moisture-stable nickel-based
catalyst with excellent magnetic properties supported on silica-coated
magnetic Fe3O4 nanoparticles was successfully
synthesized. It was well characterized by Fourier transform infrared
spectroscopy, powder X-ray diffraction, transmission electron microscopy,
field emission scanning electron microscopy, thermogravimetric analysis,
dynamic light scattering (DLS), X-ray photoelectron spectroscopy,
vibration sample magnetometry, energy-dispersive X-ray analysis, inductively
coupled plasma analysis, and nitrogen adsorption–desorption
isotherm analysis. The Suzuki–Miyaura coupling reaction between
aryl carbamates and/or sulfamates with arylboronic acids was selected
to demonstrate the catalytic activity and efficiency of the as-prepared
magnetic nanocatalyst. Using the mentioned heterogeneous nanocatalyst
in such reactions generated corresponding products in good to excellent
yields in which the catalyst could easily be recovered from the reaction
mixture with an external magnetic field to reuse directly for the
next several cycles without significant loss of its activity.
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