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Cu(II) and magnetite nanoparticles decorated melamine-functionalized chitosan: A synergistic multifunctional catalyst for sustainable cascade oxidation of benzyl alcohols/Knoevenagel condensation

The uniform decoration of Cu(II) species and magnetic nanoparticles on the melamine-functionalized chitosan afforded a new supramolecular biopolymeric nanocomposite (Cs-Pr-Me-Cu(II)-Fe(3)O(4)). The morphology, structure, and catalytic activity of the Cs-Pr-Me-Cu(II)-Fe(3)O(4) nanocomposite have been...

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Detalles Bibliográficos
Autores principales: Alirezvani, Zahra, Dekamin, Mohammad G., Valiey, Ehsan
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6883033/
https://www.ncbi.nlm.nih.gov/pubmed/31780721
http://dx.doi.org/10.1038/s41598-019-53765-3
Descripción
Sumario:The uniform decoration of Cu(II) species and magnetic nanoparticles on the melamine-functionalized chitosan afforded a new supramolecular biopolymeric nanocomposite (Cs-Pr-Me-Cu(II)-Fe(3)O(4)). The morphology, structure, and catalytic activity of the Cs-Pr-Me-Cu(II)-Fe(3)O(4) nanocomposite have been systematically investigated. It was found that Cs-Pr-Me-Cu(II)-Fe(3)O(4) nanocomposite can smoothly promote environmentally benign oxidation of different benzyl alcohol derivatives by tert-butyl hydroperoxide (TBHP) to their corresponding benzaldehydes and subsequent Knoevenagel condensation with malononitrile, as a multifunctional catalyst. Interestingly, Fe(3)O(4) nanoparticles enhance the catalytic activity of Cu(II) species. The corresponding benzylidenemalononitriles were formed in high to excellent yields at ambient pressure and temperature. The heterogeneous Cs-Pr-Me-Cu(II)-Fe(3)O(4) catalyst was also very stable with almost no leaching of the Cu(II) species into the reaction medium and could be easily recovered by an external magnet. The recycled Cs-Pr-Me-Cu(II)-Fe(3)O(4) was reused at least four times with slight loss of its activity. This is a successful example of the combination of chemo- and bio-drived materials catalysis for mimicing biocatalysis as well as sustainable and one pot multistep synthesis.