In this work, a versatile protocol was introduced for the preparation of a new Cu(I) supported complex on Silica supported boehmite nanoparticles (Boehmite@SiO2@Tris‐Cu(I)). The structure of the catalyst was comprehensively characterized using Fourier transform infrared spectroscopy (FT‐IR), X‐Ray Diffractometer (XRD), energy‐dispersive X‐ray spectroscopy (EDS), inductively coupled plasma atomic emission spectroscopy (ICP), X‐ray mapping, thermogravimetric analysis (TGA) and scanning electron microscopy (SEM) techniques. The catalytic activity of this catalyst was studied in the Suzuki cross‐coupling reaction and synthesis of 5‐substituted 1H‐tetrazole derivatives in ethanol and PEG‐400 respectively as green solvents. In this sense, simple preparation of the catalyst from the commercially available materials, high catalytic activity, simple operation, short reaction times, high yields and use of green solvent are some advantages of this protocol. Finally, it is worth mentioning that this nanocatalyst was easily recovered, and reused for several times without significant loss of its catalytic efficiency. In addition, stability of the catalyst after recycling was confirmed by FT‐IR technique.
In this research project, silica‐modified ZnFe2O4 magnetic nanoparticles were prepared in a simple, short, and straightforward way. Subsequently, an efficient catalyst through immobilization of ascorbic acid on the surface of silica‐coated ZnFe2O4 nanoparticles has been produced. The physical and chemical properties of ZnFe2O4@SiO2‐ascorbic acid were considered by X‐ray diffraction (XRD), Fourier transform infrared spectroscopy (FT‐IR), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), Energy‐dispersive X‐ray spectroscopy (EDS), and vibrating sample magnetometer (VSM) analyses. The catalytic activity of described magnetic nanocatalyst was checked out for the synthesis of chromeno[2,3‐d] pyrimidine‐8‐amine and quinazolinone derivatives. The described catalyst was recovered and reused for five continuous cycles without considerable change in its catalytic activity.
In this paper, we report the synthesis of ZnFe2O4@SiO2@APTES@DHBS-Cu as a novel magnetic nanocatalyst, in a mild and green environment. The structure of the described magnetic compound was characterized by different physicochemical techniques including XRD, EDS, AAS, SEM, FT-IR, X-ray elemental mapping, TGA, and VSM analyses. The prepared magnetic nanoparticles exhibit excellent catalytic activity in synthesizing bis (pyrazolyl)methanes and oxidation of sulfide derivatives under green conditions. The heterogeneous nature of the catalyst was confirmed via the hot filtration experiment. Further, ZnFe2O4@SiO2@APTES@DHBS-Cu showed high efficiency and reusability that could be reused for at least five consecutive runs.
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