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Issue 6, 2014
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An ammonium molybdate deposited amorphous silica coated iron oxide magnetic core–shell nanocomposite for the efficient synthesis of 2-benzimidazoles using hydrogen peroxide

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Abstract

An ammonium molybdate deposited amorphous silica coated iron oxide (Fe3O4@SiO2) magnetic core–shell nanocomposite was prepared and tested in the application to the synthesis of 2-benzimidazoles from aromatic aldehydes and o-phenylenediamines using hydrogen peroxide as an oxidant at room temperature. It was found that the yields were fundamentally influenced by the nature and position of the substituents on the phenyl ring. Brunauer–Emmett–Teller (BET) analysis, X-ray diffraction (XRD), transmission electron microscopy (TEM), energy-dispersive X-ray (EDX), and X-ray photoelectron spectroscopy (XPS) confirmed that the active ammonium molybdate species are highly dispersed on the surface of the Fe3O4@SiO2 magnetic core–shell nanocomposite, accounting for its good activity. A method was eventually developed for the synthesis of 2-benzimidazoles highlighting the good activity and easily recyclable nature of this magnetic catalyst.

Graphical abstract: An ammonium molybdate deposited amorphous silica coated iron oxide magnetic core–shell nanocomposite for the efficient synthesis of 2-benzimidazoles using hydrogen peroxide

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Publication details

The article was received on 16 Dec 2013, accepted on 17 Mar 2014 and first published on 20 Mar 2014


Article type: Paper
DOI: 10.1039/C3GC42551G
Citation: Green Chem., 2014,16, 3160-3168
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    An ammonium molybdate deposited amorphous silica coated iron oxide magnetic core–shell nanocomposite for the efficient synthesis of 2-benzimidazoles using hydrogen peroxide

    G. Bai, X. Lan, X. Liu, C. Liu, L. Shi, Q. Chen and G. Chen, Green Chem., 2014, 16, 3160
    DOI: 10.1039/C3GC42551G

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