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Chiral periodic mesoporous copper(II) bis(oxazoline) phenylene-silica: A highly efficient and reusable asymmetric heterogeneous catalyst

AuthorsLourenço, Mirtha A. O.; Carneiro, Liliana; Mayoral, Álvaro; Díaz Carretero, Isabel ; Silva, Ana R.; Ferreira, Paula
KeywordsAsymmetric catalysis
Periodic mesoporous organosilicas
Heterogeneous catalysis
Homogeneous catalysis
Issue DateDec-2014
CitationJournal of Catalysis 320: 63-69 (2014)
AbstractWe describe the preparation of an effective and reusable heterogeneous asymmetric catalyst. A novel chiral periodic mesoporous phenylene–silica containing high density of bis(oxazoline) moieties is prepared by co-condensation method with 1,4-bis(triethoxysilyl)benzene. After copper(II) coordination, the material is extremely efficient on the kinetic resolution of the 1,2-diphenylethane-1,2-diol with persistent high enantioselectivities (91 - > 99%) and yields (46–43% in maximum 50% resolution) at least for five consecutive cycles. Characterization of the material after the catalytic experiments showed that the heterogeneous catalyst was very robust keeping the integrity of the structure.
Publisher version (URL)https://doi.org/10.1016/j.jcat.2014.09.017
Appears in Collections:(ICP) Artículos
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