Synthesis of pyranopyrazoles using magnetically recyclable heterogeneous iron oxide-silica core-shell nanocatalyst

Jedol Dayou, and Coswald Stephen Sipaut @ Mohd Nasri, and Rachel Fran Mansa, and Parisa Saei, and Ebrahim Soleimani, and Mohammad Jafarzadeh, (2016) Synthesis of pyranopyrazoles using magnetically recyclable heterogeneous iron oxide-silica core-shell nanocatalyst. Journal of the Chinese Chemical Society, 62 (12). pp. 1155-1162. ISSN 2192-6549

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Official URL: http://dx.doi.org/10.1002/jccs.201400387

Abstract

The Fe₅O₄@SiO₂ core-shell nanocatalyst were prepared and efficiently used for four-component coupling reaction of aromatic aldehydes, malononitrile, ethyl acetoacetate and hydrazine hydrate in water/ethanol mixture. Various aromatic aldehydes possessing electron-withdrawing and electron-donating groups in different positions on the ring were successfully transformed to substituted pyranopyrazoles in high yields in short time. The nanocatalyst was easily recovered, and reused five times without significant loss in cata- lytic activity and performance. The structure, size and morphology of the nanosized catalyst were studied by various techniques such as Fourier transform infrared spectroscopy, powder X-ray diffraction, dynamic light scattering and transmission electron microscopy.

Item Type:Article
Uncontrolled Keywords:Pyranopyrazole, Multi-component reactions, Nanocatalyst, Core-shell, Silica
Subjects:Q Science > Q Science (General)
Divisions:FACULTY > Faculty of Engineering
ID Code:13749
Deposited By:IR Admin
Deposited On:03 Aug 2016 14:12
Last Modified:03 Aug 2016 14:12

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