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Synthesis of Pyranopyrazoles Using Magnetically Recyclable Heterogeneous Iron Oxide‐silica Core‐shell Nanocatalyst
Author(s) -
Soleimani Ebrahim,
Jafarzadeh Mohammad,
Norouzi Parastoo,
Dayou Jedol,
Sipaut Coswald Stephen,
Mansa Rachel Fran,
Saei Parisa
Publication year - 2015
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.201400387
Subject(s) - chemistry , malononitrile , hydrazine (antidepressant) , transmission electron microscopy , ethyl acetoacetate , catalysis , hydrate , dynamic light scattering , fourier transform infrared spectroscopy , nuclear chemistry , chemical engineering , inorganic chemistry , polymer chemistry , organic chemistry , nanoparticle , chromatography , engineering
The Fe 3 O 4 @SiO 2 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.