Heterogeneous Hybrid Nanocomposite Based on Chitosan/Magnesia Hybrid Films: Ecofriendly and Recyclable Solid Catalysts for Organic Reactions
| Autor: | Khaled D. Khalil, Metwally Madkour, Fakhreia Al-Sagheer |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Nanocomposite Polymers and Plastics Magnesium magnesia heterogeneous catalyst chemistry.chemical_element Organic chemistry General Chemistry Heterogeneous catalysis Condensation reaction Article Catalysis Chitosan chemistry.chemical_compound Michael additions QD241-441 Organic reaction chemistry Chemical engineering Knoevenagel reactions nanocomposites Knoevenagel condensation chitosan |
| Zdroj: | Polymers, Vol 13, Iss 3583, p 3583 (2021) Polymers Volume 13 Issue 20 |
| ISSN: | 2073-4360 |
| Popis: | Chitosan/magnesia hybrid films (CS-Mg) have been prepared via sol-gel process and employed as heterogeneous catalysts. An in situ generation of a magnesia network in the chitosan matrix was performed through hydrolysis/condensation reactions of magnesium ethoxide. The synthesized hybrid films were characterized using various analytical techniques, such as X-ray photo-electron spectroscopy (XPS), field emission scanning electron microscopy (FESEM) and atomic force microscopy (AFM). The hybrid films display excellent catalytic activities in Michael and Knoevenagel reactions via one pot or solvent-free approaches under microwave irradiation conditions. Chitosan/magnesia hybrid films, catalysed pyrimidine, benzochromene, coumarin and arylidene-malononitriles derivatives formation reactions occurred with highly efficient yields of 97%, 92%, 86% and 95% respectively. Due to the fact that the films are durable and insoluble in common organic solvents, they were easily separated and can be recycled up to five times without a considerable loss of their catalytic activity. |
| Databáze: | OpenAIRE |
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