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

被引：57
|
作者：
Bai, Guoyi [1 ]
Lan, Xingwang [1 ]
Liu, Xiaofang [1 ]
Liu, Chen [1 ]
Shi, Lingjuan [1 ]
Chen, Qingzhi [1 ]
Chen, Guofeng [1 ]
机构：
[1] Hebei Univ, Coll Chem & Environm Sci, Key Lab Chem Biol Hebei Prov, Baoding 071002, Peoples R China
来源：
GREEN CHEMISTRY | 2014年 / 16卷 / 06期
基金：
中国国家自然科学基金;
关键词：
ONE-POT SYNTHESIS; SUBSTITUTED DODECATUNGSTOPHOSPHORIC ACID; HIGHLY EFFICIENT; 2-SUBSTITUTED BENZIMIDAZOLES; ROOM-TEMPERATURE; ACTIVATED CARBON; K-10; CLAY; CATALYST; SYSTEM; DERIVATIVES;
D O I：
10.1039/c3gc42551g
中图分类号：
O6 [化学];
学科分类号：
0703 ;
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 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.
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页码：3160 / 3168
页数：9
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