Journal ArticleDOI
Graphene oxide–chitosan bionanocomposite: a highly efficient nanocatalyst for the one-pot three-component synthesis of trisubstituted imidazoles under solvent-free conditions
Ali Maleki,Reza Paydar +1 more
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TLDR
In this article, a green, rapid, convenient and eco-friendly method for the synthesis of 2,4,5-trisubstituted imidazoles is described.Abstract:
In the present work, a green, rapid, convenient and eco-friendly method for the synthesis of 2,4,5-trisubstituted imidazoles is described. In this method, we used 1,2-diketone or α-hydroxy ketone, an aldehyde and ammonium acetate in the presence of graphene oxide–chitosan bionanocomposite, which acted as an efficient nanocatalyst. This protocol has many advantages such as short reaction time, high yield, easy separation of the catalyst and solvent-free condition. We used differential scanning calorimetry (DSC), Fourier transform infrared spectroscopy (FT-IR) and atomic force microscopy (AFM) to confirm that the nanocomposite was formed, and FT-IR, 1H and 13C NMR analyses were performed for the confirmation of the synthesized products.read more
Citations
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Magnetic cellulose/Ag as a novel eco-friendly nanobiocomposite to catalyze synthesis of chromene-linked nicotinonitriles.
TL;DR: The remarkable magnetic property of the nanobiocomposite catalyst provides easy separation from the reaction mixture by an external magnet without considerable loss of its catalytic activity.
Journal ArticleDOI
Selective Semihydrogenation of Alkynes with N-Graphitic-Modified Cobalt Nanoparticles Supported on Silica
Feng Chen,Carsten Kreyenschulte,Jörg Radnik,Henrik Lund,Annette-Enrica Surkus,Kathrin Junge,Matthias Beller +6 more
TL;DR: In this paper, N-graphitic modified cobalt nanoparticles (Co/phen@SiO2-800) were shown to be active in the semihydrogenation of alkynes to alkenes.
Journal ArticleDOI
Design, synthesis, characterization and catalytic performance of a new cellulose‐based magnetic nanocomposite in the one‐pot three‐component synthesis of α‐aminonitriles
TL;DR: A sulfonated magnetic cellulose-based nanocomposite was used as a green nanocatalyst for the synthesis of α-aminonitriles by a one-pot three-component condensation reaction of aldehydes or ketones, amines and trimethylsilylcyanide in ethanol at room temperature as mentioned in this paper.
Journal ArticleDOI
A review on chitosan and chitosan-based bionanocomposites: Promising material for combatting global issues and its applications.
TL;DR: In this article, the authors discuss various sources of chitosan, its properties and methods of modification, and their emerging application in various sectors, and shed light on future research scope with some drawbacks and challenges.
Journal ArticleDOI
Design and development of a novel cellulose/γ-Fe2O3/Ag nanocomposite: a potential green catalyst and antibacterial agent
TL;DR: A cellulose/γ-Fe2O3/Ag nanocomposite is synthesized and used as a catalyst for the synthesis of trisubstituted imidazoles and α-aminonitriles.
References
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Journal ArticleDOI
A review of chitin and chitosan applications
TL;DR: Chitin is the most abundant natural amino polysaccharide and is estimated to be produced annually almost as much as cellulose, and recent progress in chitin chemistry is quite noteworthy as mentioned in this paper.
Journal ArticleDOI
Chemistry and Biology Of Multicomponent Reactions
TL;DR: This paper presents a new approach to drug design called “combinatorial biosynthesis and drug discovery through nanofiltration”, which combines the efforts of a single investigator with those of a number of other scientists.
Journal ArticleDOI
A review on synthesis and properties of polymer functionalized graphene
Rama K. Layek,Arun K. Nandi +1 more
TL;DR: In this paper, the authors highlight the functionalization chemistry of graphene with polymers by both covalent and non-covalent approaches and highlight the properties of these modified graphenes with an emphasis on different area where future developments are expected.
Journal ArticleDOI
Copper‐Catalyzed Intramolecular Dehydrogenative Aminooxygenation: Direct Access to Formyl‐Substituted Aromatic N‐Heterocycles
TL;DR: In this article, Nallyl-2-aminopyridines or N-allylamidines were treated with O2 in the presence of a copper catalyst to produce formyl-substituted imidazole skeletons from acyclic substrates.
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