Chiral periodic mesoporous copper(II) bis(oxazoline) phenylene-silica: A highly efficient and reusable asymmetric heterogeneous catalyst
authors Lourenco, MAO; Carneiro, L; Mayoral, A; Diaz, I; Silva, AR; Ferreira, P
nationality International
journal JOURNAL OF CATALYSIS
author keywords Heterogeneous catalysis; Asymmetric catalysis; Homogeneous catalysis; Periodic mesoporous organosilicas; Co-condensation
keywords ENANTIOSELECTIVE CATALYSIS; KINETIC RESOLUTION; CARBON REPLICAS; ORGANOSILICA; COMPLEXES; LIGANDS; SUPPORT; CYCLOPROPANATION; IMMOBILIZATION; BISOXAZOLINES
abstract We 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. (C) 2014 Elsevier Inc. All rights reserved.
publisher ACADEMIC PRESS INC ELSEVIER SCIENCE
issn 0021-9517
year published 2014
volume 320
beginning page 63
ending page 69
digital object identifier (doi) 10.1016/j.jcat.2014.09.017
web of science category Chemistry, Physical; Engineering, Chemical
subject category Chemistry; Engineering
unique article identifier WOS:000347134100008

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