Novel Functional Hollow and Multihollow Organic Microspheres: Enhanced Efficiency in a Complex, Heterogeneous, Asymmetric, Three-Component/Triple Organocascade Reaction.

Autor: Dai, Fuqiang, Zhao, Zhiwei, Xie, Guangxin, Feng, Dandan, Ma, Xuebing
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Zdroj: ChemCatChem; 1/9/2017, Vol. 9 Issue 1, p89-93, 5p
Abstrakt: The pioneered construction of monodisperse hollow and multihollow Jørgensen-Hayashi-functionalized microspheres with a well-defined spherical morphology, high surface area, and large pore volume were developed by initial dispersion copolymerization of the Jørgensen-Hayashi organocatalyst with acrylamide and styrene monomers cross-linked by p-divinylbenzene and ethylene glycol dimethacrylate, respectively, on the surface of poly(styrene/acrylic acid) (PS) microspheres to form core-shell structures, followed by removal of the PS core by etching in organic solvents. The as-prepared hollow and multihollow microspheres were able to achieve better mass transfer in a complex heterogeneous asymmetric three-component/triple cascade reaction and provided the products in good yields (31-61 %) with excellent stereoselectivities (80:20-93:7 dr, >99 % ee). [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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