Fibrous nano-silica sphere (KCC-1) has appeared as a good and efficient catalyst for ultrasonic irradiation conditions in chemical reactions. This catalyst has the unique properties such as a fibrous surface morphology, high surface area and high mechanical stability. The results indicated that the KCC-1 nanocatalyst could be used as high-performance catalysts under high temperature and pressure condition in organic reaction under ultrasonic irradiation. Morphology, structure, and composition of the fibrous nano-silica sphere were described by N2 adsorption–desorption analysis, scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray powder diffraction (XRD), thermogravimetric analysis (TGA) and Fourier-transform infrared spectroscopy (FT-IR). In this work, we used KCC-1@NH2 nanosilica as a basic catalyst for the preparation of chromenes under ultrasonic irradiation conditions for the first time. The recyclability, nontoxicity and high stability of the catalyst, combined with low reaction times and excellent yields, make the present protocol very useful for the synthesis of the title products under ultrasonic conditions. The produced products were confirmed via 1H NMR, 13C NMR, FT-IR analysis.

In this study, morpholine sulfate acidic ionic liquid bonded on magnetite nanoparticles (Mag@Morph-AIL) has been used as a catalyst for the preparation of 3,4-dihydropyrimidinones.

No abstract

l-Tryptophan functionalized silica-coated magnetic nanoparticles were prepared and evaluated as a magnetic nanocatalyst for the synthesis of spiro[indene-2,2′-naphthalene]-4′-carbonitrile derivatives through the one-pot four-component reaction.

No abstract

In this paper, a novel inorganic‐organic hybrid catalyst based on Fe3O4 has been successfully developed during four simple steps. After construction of Fe3O4@SCH2CO2H, the presence of nickel and urea converts this catalyst into the porous nano magnetic catalyst. The prepared nanocatalyst was identified by FT‐IR, VSM, XRD, FE‐SEM, EDX, elemental mapping, TGA, TEM, and BET. Then, we have employed the prepared catalyst as a recoverable heterogeneous and nanoporous catalyst for synthesis of spiro[indene‐2,2’‐naphthalene]‐4’‐ carbonitrile derivatives via one‐pot telescopic four component reaction of malononitrile, cyclohexanone, aromatic aldehydes, and 1,3‐indandione under ultrasonic irradiation. As anticipated, prepared catalyst displayed significant performance in the promoting of the studied reaction. Eco‐friendly, facile workup, medium to excellent yields in short reaction times, broad range of products, high catalytic performance and reusability of the catalyst are some of the noticeable advantages of this protocol. Further, we can separate and reuse the catalyst six times without any significant loss of activity.

Fibrous nano-silica sphere (KCC-1) has appeared as a good and efficient catalyst for ultrasonic irradiation conditions in chemical reactions. This catalyst has the unique properties such as a fibrous surface morphology, high surface area and high mechanical stability. The results indicated that the KCC-1 nanocatalyst could be used as high-performance catalysts under high temperature and pressure condition in organic reaction under ultrasonic irradiation. Morphology, structure, and composition of the fibrous nano-silica sphere were described by N2 adsorption–desorption analysis, scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray powder diffraction (XRD), thermogravimetric analysis (TGA) and Fourier-transform infrared spectroscopy (FT-IR). In this work, we used KCC-1@NH2 nanosilica as a basic catalyst for the preparation of chromenes under ultrasonic irradiation conditions for the first time. The recyclability, nontoxicity and high stability of the catalyst, combined with low reaction times and excellent yields, make the present protocol very useful for the synthesis of the title products under ultrasonic conditions. The produced products were confirmed via 1H NMR, 13C NMR, FT-IR analysis.