Mesoporous silica KIT-6 supported superparamagnetic CuFe₂O₄nanoparticles for catalytic asymmetric hydrosilylation of ketones in air

Abstract

Asymmetric hydrosilylation of ketones catalyzed by magnetically recoverable superparamagnetic CuFe2O4 nanoparticles supported on mesoporous silica KIT-6 proceeded in air with up to 97% ee.

In Vivo Repeatedly Charging Near‐Infrared‐Emitting Mesoporous SiO2/ZnGa2O4:Cr3+ Persistent Luminescence Nanocomposites

“…[24] We speculate that homogeneous distribution of these reactants in confined mesoporous nanostructures results in a higher reactivity than would otherwise be the case; such phenomena were observed previously. [25–29] …”

“…The decrease in synthesis temperatures from those generally used implies that the utilization of the pores of MSNs as nanoreactors facilitates the formation of ZGC phosphor . We speculate that homogeneous distribution of these reactants in confined mesoporous nanostructures results in a higher reactivity than would otherwise be the case; such phenomena were observed previously …”

Preparation of magnetically separable Cu6/7Co1/7Fe2O4–graphene catalyst and its application in selective reduction of nitroarenes

“…In recent years, MFe 2 O 4 has been widely applied in sensors, electronics and catalysis because it exhibits several advantages, such as relatively cheap, environmentally compatible, moisture insensitive, high dispersive, and easily separative [24]. Li et al [25] explored mesoporous silica KIT-6 supported superparamagnetic CuFe 2 O 4 nanoparticles for catalytic asymmetric hydrosilylation of ketones in air. Parella et al [26] developed the catalytic application of CuFe 2 O 4 nanoparticles for the Friedel-Crafts acylation.…”

A supramolecularly tunable chiral diphosphine ligand: application to Rh and Ir-catalyzed enantioselective hydrogenation

“…To the best of our knowledge, examples of tunable ligands or catalysts illustrating this concept remained rare. Herein, we describe our research on introducing crown ethers, as host sites for recognition, to the scaffold of a well-established chiral dipyridylphosphine ligand Xyl-P-Phos 2c , 18 , 19 to form new ligands, (–) or (+)-Xyl-P16C6-Phos ((–) or (+)- 7 , Scheme 1 ). Utilizing the selective recognition and strong complexation between the crown ethers on 7 and different alkali cations, 20 supramolecularly tunable chiral catalysts ( Scheme 2 ) have been constructed and applied in both a Rh-catalyzed asymmetric hydrogenation of α-dehydroamino acid derivatives and an Ir-catalyzed asymmetric hydrogenation of quinolines.…”