Magnetic nanoparticle-supported crown ethers

Abstract

Magnetic nanoparticle (MNP)-supported crown ethers were successfully prepared and evaluated as catalysts for solid-liquid phase-transfer reactions; the catalytic activities of the MNP-supported crown ethers were not inferior to those of non-supported crown ethers; after the reactions, the catalysts could be readily separated using an external magnet and reused without significant loss of catalytic efficiency.

A novel magnetic NiFe2O4@graphene–Pd multifunctional nanocomposite for practical catalytic application

“…[14][15] However, these GN-based catalysts, although with outstandingly high activity, were difficult and time consuming to be separated from the reaction mixture by common ltration or centrifugation. [20][21][22][23][24][25] NiFe 2 O 4 has been reported as viable magnetic materials. [20][21][22][23][24][25] NiFe 2 O 4 has been reported as viable magnetic materials.…”

Fe3O4 Nanoparticles-Supported Palladium-Bipyridine Complex: Effective Catalyst for Suzuki Coupling Reaction

“…The various types of organic reactions using the MNPs-supported catalysts that have emerged recently include C-C coupling reactions [17][18][19][20][21][22][23][24], hydroformylation [25,26], hydrogenation [27][28][29][30][31][32][33][34][35], C-N coupling reaction [36,37], oxidation [38][39][40][41][42][43], cleavage of allyl esters and ethers (deallylation catalyst) [44], enantioselective acylation [45], multicomponents Aza-Sakurai reaction [46], the Paal-Knorr reaction [47], CO 2 cycloaddition reactions [48], asymmetric hydrosilylation of ketones [49], and esterification [50]. Other reports of MNPs-supported catalysts include O-Alkylation reaction [51], halogen exchange reaction [52], polymerization reactions [53], enzymes for carboxylate resolution [54], amino acids for ester hydrolysis [55], organic amine catalysts promoting Knoevenagel [56], one-pot reaction cascades [57], and the various acidcatalyzed reactions (deprotection reaction of benzaldehyde dimethylacetal) [58]. Concerning the Suzuki coupling reactions, palladium complexes...…”

A Novel Approach to Molecular Recognition Surface of Magnetic Nanoparticles Based on Host–Guest Effect

“…Recently, the functionalization of nanoparticle surfaces with macrocyclic host molecules in well-defined host–guest interactions has drawn considerable attention [3-25]. The combination of the physical properties of nanostructured materials and the molecular recognition ability of host molecules adsorbed on the nanoparticles surface makes them to exhibit promising applications in different fields such as catalysis [5-7], nanotechnology [8,9], environment [10], chemical sensing [11-16], and so on. However, only a few cases concerning the bonding of CDs to nanoparticles have been investigated [5-10][21-25].…”

“…The combination of the physical properties of nanostructured materials and the molecular recognition ability of host molecules adsorbed on the nanoparticles surface makes them to exhibit promising applications in different fields such as catalysis [5-7], nanotechnology [8,9], environment [10], chemical sensing [11-16], and so on. However, only a few cases concerning the bonding of CDs to nanoparticles have been investigated [5-10][21-25]. At present, the research work on taking CD derivatives as capping ligands for nanoparticles is focused on the attachment of perthiolated CDs (SH-CDs) on metal nanoparticle surfaces.…”