An ammonium molybdate deposited amorphous silica coated iron oxide magnetic core–shell nanocomposite for the efficient synthesis of 2-benzimidazoles using hydrogen peroxide
作者： Guoyi Bai , Xingwang Lan , Xiaofang Liu , Chen Liu , Lingjuan Shi
DOI: 10.1039/C3GC42551G
关键词: Materials science 、 Nanocomposite 、 Catalysis 、 Transmission electron microscopy 、 Iron oxide 、 Nuclear chemistry 、 Inorganic chemistry 、 Ammonium molybdate 、 Hydrogen peroxide 、 X-ray photoelectron spectroscopy 、 Magnetic core
摘要: An ammonium molybdate deposited amorphous silica coated iron oxide (Fe3O4@SiO2) magnetic core–shell nanocomposite was prepared and tested in the application to synthesis of 2-benzimidazoles from aromatic aldehydes o-phenylenediamines using hydrogen peroxide as an oxidant at room temperature. It found that yields were fundamentally influenced by nature position substituents on phenyl ring. Brunauer–Emmett–Teller (BET) analysis, X-ray diffraction (XRD), transmission electron microscopy (TEM), energy-dispersive (EDX), photoelectron spectroscopy (XPS) confirmed active species are highly dispersed surface Fe3O4@SiO2 nanocomposite, accounting for its good activity. A method eventually developed highlighting activity easily recyclable this catalyst.
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