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Tungstic acid-functionalized Fe3O4@TiO2: preparation, characterization and its application for the synthesis of pyrano[2,3-c]pyrazole derivatives as a reusable magnetic nanocatalyst.

ABSTRACT: A new magnetic nanocatalyst based on the immobilization of tungstic acid onto 3-chloropropyl-grafted TiO2-coated Fe3O4 nanoparticles (Fe3O4@TiO2@(CH2)3OWO3H) was prepared, characterized, and applied for the synthesis of pyrano[2,3-c]pyrazole derivatives. The characterization was performed using FT-IR spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), and vibrating sample magnetometry (VSM) analysis. Pyranopyrazoles were synthesized in the presence of this novel catalyst via a three-component reaction of 3-methyl-1-phenyl-2-pyrazolin-5-one, malononitrile, and aromatic aldehydes with high yields. It is a low cost, nontoxic and thermally stable catalyst, which shows a long life and can be reused for several catalytic cycles without deactivation or selectivity loss.

SUBMITTER: Gholtash JE 

PROVIDER: S-EPMC9091629 | biostudies-literature | 2018 Dec

REPOSITORIES: biostudies-literature

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Tungstic acid-functionalized Fe<sub>3</sub>O<sub>4</sub>@TiO<sub>2</sub>: preparation, characterization and its application for the synthesis of pyrano[2,3-<i>c</i>]pyrazole derivatives as a reusable magnetic nanocatalyst.

Gholtash Jamileh Etemad JE   Farahi Mahnaz M  

RSC advances 20181206 71

A new magnetic nanocatalyst based on the immobilization of tungstic acid onto 3-chloropropyl-grafted TiO<sub>2</sub>-coated Fe<sub>3</sub>O<sub>4</sub> nanoparticles (Fe<sub>3</sub>O<sub>4</sub>@TiO<sub>2</sub>@(CH<sub>2</sub>)<sub>3</sub>OWO<sub>3</sub>H) was prepared, characterized, and applied for the synthesis of pyrano[2,3-<i>c</i>]pyrazole derivatives. The characterization was performed using FT-IR spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive  ...[more]

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