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- W2417247524 abstract "Heterogeneous chiral catalysts, mostly solid catalysts possess inherent features of practical advantages for industrial processes, such as simple separation and reuse of chiral catalysts, easy purification of products, and convenient operation processes. Therefore heterogeneous asymmetric catalysis is becoming a fascinating area for both the academic research and the commercial applications. However, the activity and enantioselectivity of most chiral solids is not high which impedes the practical applications of heterogeneous asymmetric catalysis.Recently, the novel chiral porous materials, the chiral periodic mesoporous organosilicas, were synthesized by our group and these materials show application potentials in heterogeneous asymmetric catalysis [1]. Moreover, our group developed an efficient method for the preparation of nanoreactors for asymmetric catalysis by encapsulating transition metal complexes in the nanocage of mesoporous silicas [2-5]. For example, chiral [Co(Salen)] complexes have been confined in the nanocage of SBA-16 by reducing the pore entrance size through a silylation method, resulting in a solid catalyst for the hydrolytic kinetic resolution (HKR) of epoxides. It was found that the activity of the solid catalysts increased with the number of [Co(Salen)] molecules per nanocage increasing, and the solid catalyst with more than two chiral [Co(Salen)] molecules in one nanocage of SBA-16 exhibits much higher activity and enantioselectivity than the homogeneous [Co(Salen)] catalyst in the HKR of epoxides at low substrate/catalyst ratio. The significantly improved activity of the solid catalyst is due to a high local concentration of [Co(Salen)] in nanospace because of the enhanced cooperative activation effect of [Co(Salen)] molecules. This work provides a new opportunity for the design of efficient solid catalysts for the asymmetric reactions as well as many other reactions, which involve cooperative activation by separate catalytic centers or second-order kinetic dependence on the local concentration of catalysts." @default.
- W2417247524 created "2016-06-24" @default.
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- W2417247524 date "2011-07-10" @default.
- W2417247524 modified "2023-09-24" @default.
- W2417247524 title "Asymmetric catalysis in nanopore materials" @default.
- W2417247524 hasPublicationYear "2011" @default.
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