Abstract
Efficient and general protocols for the O-tert-boc protection and O-arylation of phenols were developed in this paper using a recyclable magnetic Fe3O4-Co3O4 nanocatalyst (Nano-Fe-Co), which is easily accessible via simple wet impregnation techniques in aqueous mediums from inexpensive precursors. The results showed the catalysts were well characterized by XRD (X-ray Diffraction), ICP-AES (Inductive Coupled Plasma Atomic Emission Spectroscopy), TEM (Transmission Electron Microscopy), TOF-SIMS (Time-Of-Flight Secondary Ion Mass Spectrometry) and XPS (X-ray Photoelectron Spectroscopy). The O-tert-boc protection and O-arylation of phenols was accomplished in good to excellent yields (85–95%) and the catalyst was reusable and recyclable with no loss of catalytic activity for at least six repetitions.
Highlights
Significant research efforts have been devoted to the development of sustainable/greener organic transformations, which are either catalyst-free, solvent-free or performed in an aqueous medium [1,2]
Efficient and general protocols for the O-tert-boc protection and O-arylation of phenols were developed in this paper using a recyclable magnetic Fe3O4-Co3O4 nanocatalyst (Nano-Fe-Co), which is accessible via simple wet impregnation techniques in aqueous mediums from inexpensive precursors
The results showed the catalysts were well characterized by X-ray diffraction (XRD) (X-ray Diffraction), inductive coupled plasma atomic emission spectroscopy (ICP-AES) (Inductive Coupled Plasma Atomic Emission Spectroscopy), transmission electron microscopy (TEM) (Transmission Electron Microscopy), TOF-SIMS (Time-Of-Flight Secondary Ion Mass Spectrometry) and X-ray photoelectron spectroscopy (XPS) (X-ray Photoelectron Spectroscopy)
Summary
Significant research efforts have been devoted to the development of sustainable/greener organic transformations, which are either catalyst-free, solvent-free or performed in an aqueous medium [1,2]. Using Fe3O4 as a magnetic support has been popular for the immobilization of diverse metals, namely ruthenium [16,17], palladium [18] and nickel [19] Such Fe3O4 supported nanocatalysts are known to catalyze numerous reactions, namely asymmetric Michael additions in aqueous mediums [20]; Suzuki-, Sonogashira-, and Stille-reactions [21]; enantioselective acylation [22]; and Suzuki–Miyaura coupling reactions [23], and has garnered significant attention because of its relevance to industry and academia. The full potential of catalytically active species supported by Fe3O4 for other unattended sustainable organic transformations remains to be explored
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