Preparation of polydopamine sulfamic acid-functionalized magnetic Fe3O4 nanoparticles with a core/shell nanostructure as heterogeneous and recyclable nanocatalysts for the acetylation of alcohols, phenols, amines and thiols under solvent-free conditions

被引:137
作者
Veisi, Hojat [1 ]
Taheri, Sepideh [2 ]
Hemmati, Saba [1 ]
机构
[1] Payame Noor Univ, Dept Chem, Tehran, Iran
[2] Islamic Azad Univ, Fac Pharmaceut Chem, Pharmaceut Sci Branch, Dept Pharmaceut Chem, Tehran, Iran
关键词
MIYAURA COUPLING REACTIONS; REUSABLE CATALYST; HIGHLY EFFICIENT; PALLADIUM NANOPARTICLES; ACYLATION CATALYST; AQUEOUS-MEDIA; WATER; DIAMINOGLYOXIME; ENRICHMENT; ALDEHYDES;
D O I
10.1039/c6gc01975g
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
A convenient method for the loading of sulfonic acid groups on the surface of polydopamine (PDA)-encapsulated Fe3O4 nanoparticles is proposed to fabricate a core-shell Fe3O4@PDA-SO3H nanocatalyst. Such surface functionalization of magnetic particles is an elegant way to bridge the gap between heterogeneous and homogeneous catalysis. The as-prepared nanocatalyst was characterized using Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDS), wavelength-dispersive X-ray spectroscopy (WDX), thermogravimetric analysis (TGA), a vibrating sample magnetometer (VSM), X-ray photoelectron spectroscopy (XPS), and back titration. The Fe3O4@PDA-SO3H nanoparticles have been used as an efficient catalyst for the acetylation of a wide range of alcohols, phenols, amines and thiols with acetic anhydride in good to excellent yields under solvent-free conditions. Furthermore, the recovery and reuse of the catalyst was demonstrated 12 times without a detectible loss in activity.
引用
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页码:6337 / 6348
页数:12
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