期刊
ADVANCED SYNTHESIS & CATALYSIS
卷 354, 期 10, 页码 2001-2008出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adsc.201100352
关键词
Hantzsch reaction; heterogeneous catalysis; immobilization; magnetic nanoparticles; multicomponent reactions; nanostructures
资金
- Semnan University Research Council
- Bu-Ali Sina University Research Council [32-1716]
- Center of Excellence in Development of Chemical Methods (CEDCM)
- National Foundation of Elites (BMN)
Surface functionalization of magnetic particles is an elegant way to bridge the gap between heterogeneous and homogeneous catalysis. The introduction of magnetic particles (MPs) in a variety of solid matrices allows the combination of well-known procedures for catalyst heterogenization with techniques for magnetic separation. We have conveniently loaded sulfonic acid groups on magnetic particles supports in which chlorosulfonic acid is used as sulfonating agent. The main targets are room temperature, solvent-free conditions, rapid (immediately) and easy immobilization technique, and low cost precursors for the preparation of highly active and stable MPs with high densities of functional groups. The inorganic, magnetic, solid acid catalyst was characterized via Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), thermal gravimetric analysis (TGA), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), dynamic light scattering (DLS), vibrating sample magnetometer (VSM) and titration. The catalyst is active for the Hantzsch reaction and the products are isolated in high to excellent yields (9098%). Supporting this acid catalyst on magnetic particles offers a simple and non-energy-intensive method for recovery and reuse of the catalyst by applying an external magnet. Isolated catalysts were reused for new rounds of reactions without significant loss of their catalytic activity.
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