β-Cyclodextrin coated Fe3O4 nanoparticles: a simple preparation and application for selective oxidation of alcohols in water

Abstract

nanopartículas core-shell (Fe 3 O4/SiO 2 /CM-β-CD). O catalisador apresenta elevada atividade na oxidação seletiva de vários álcoois usando NaOCl como oxidante e água como solvente. Foi obtido um processo seletivo na ausência de metal de transição e de fácil separação do catalisador.A magnetically separable catalyst was synthesized via a carbodiimide activation process with β-cyclodextrin functionalized by core-shell nanoparticles (Fe 3 O4/SiO 2 /CM-β-CD). The catalyst presented high activity for selective oxidation of various alcohols with NaOCl as oxidant and water only as the solvent. A substrate-selective and transition metal-free process was achieved with easy separation of the catalyst.

Tin stearate organometallic precursor prepared SnO 2 quantum dots nanopowder for aqueous- and non-aqueous medium photocatalytic hydrogen gas evolution

“…The phase transfer of QDs made possible through the formation of inclusion complexes between β-CD and the stearate-stabilized QDs. By the virtue of -OH groups on the hydrophilic surface of β-CD capped QDs, hydrogen bonding can easily be formed between the counterparts and water molecules that can render efficient wettability of β-CD capped QDs complexes which will effectively promote its dispersion and facilitate the photocatalytic hydrogen gas evolution in aqueous phase [25,26] .…”

Monochlorotriazinyl‐β‐cyclodextrin Grafted on Graphene Oxide as an Attractive Green Heterogeneous Nanoreactor for Selective Oxidation Reaction with NBS in Water

“…These reactions did not take place in the absence of nanoreactor, which could indicate the essential role of cyclodextrin. The reaction was performed in a smooth manner, which could confirm the function of β‐CD as a phase‐transfer catalyst (hydrophobic nanocavity at the center and hydrophilic outside edges) . Electron withdrawing substituted groups in benzene ring decreased the reactivity (Entry 3).…”

Facile synthesis of high dispersion γ-Fe2O3–Au nanoparticles within mesoporous silica spheres

“…It is worth noting that the pH of solution was adjusted by aqueous ammonia, b-CD would like to adsorb and assemble around gFe 2 O 3 NPs. 21 Hence, b-CD adsorbed on the surface of g-Fe 2 O 3 NPs can isolate g-Fe 2 O 3 NPs through abundant hydrophilic groups of b-CD. Secondly, a certain amount of high dispersion g-Fe 2 O 3 seed source dispersed into CTAB solution, soon aerwards, CTAB micelle coated g-Fe 2 O 3 NPs were obtained with micelle self-assembly, CTAB-stabilized g-Fe 2 O 3 NPs act as seeds for the formation of spherical mesoporous silica particles.…”