首页> 外文期刊>RSC Advances >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
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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

机译:钨酸 - 官能化Fe3O4 @ TiO2:制备,表征及其在合成吡喃[2,3-C]吡唑衍生物作为可重复使用的磁性纳米催化剂的应用

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摘要

A new magnetic nanocatalyst based on the immobilization of tungstic acid onto 3-chloropropyl-grafted TiO2-coated Fe3O4 nanoparticles (Fe3O4@TiO2@(CH2)(3)OWO3H) 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.
机译:制备基于钨酸固体化的新磁性纳米催化剂制备,其特征在于制备基于钨酸与3-氯丙基接枝的TiO 2涂覆的Fe3O4纳米颗粒(Fe 3 O 4)(3)ofO3h),并施加合成吡喃[2, 3-C]吡唑衍生物。 使用FT-IR光谱,X射线衍射(XRD),扫描电子显微镜(SEM),能量分散X射线光谱(EDS)和振动样品磁度(VSM)分析进行表征。 通过3-甲基-1-苯基-2-吡唑啉-5-一度,丙二腈和具有高收率的芳香族醛的三分组分反应在这种新型催化剂存在下合成吡喃吡唑。 它是一种低成本,无毒和热稳定的催化剂,其显示出长寿命,并且可以重复使用几个催化循环而不会失活或选择性损失。

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