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Copper(II) aza-bis(oxazoline) complex immobilized onto ITQ-2 and MCM-22 based materials as heterogeneous catalysts for the cyclopropanation of styrene

2013-09-15Journal article Open access
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dc.contributor.authorSilva, Ana R.
dc.contributor.authorGuimaraes, Vanessa
dc.contributor.authorCarneiro, Liliana
dc.contributor.authorNunes, Nelson
dc.contributor.authorBorges, Susana
dc.contributor.authorPires, Joao
dc.contributor.authorMartins, Angela
dc.contributor.authorCarvalho, Ana P.
dc.date.accessioned2013-10-31T17:51:06Z
dc.date.available2013-10-31T17:51:06Z
dc.date.issued2013-09-15
dc.description.abstractA copper(II) chiral aza-bis(oxazoline) homogeneous catalyst (CuazaBox) was anchored onto the external surface of MCM-22 and ITQ-2 structures, as well as encapsulated into hierarchical MCM-22. The transition metal complex loading onto the porous solids was determined by ICP-AES and the materials were also characterized by elemental analysis (C, N, H, S), FTIR, XPS, TG and low temperature N-2 adsorption isotherms. The materials were tested as heterogeneous catalysts in the benchmark reaction of cyclopropanation of styrene to check the effect of the immobilization procedure on the catalytic parameters, as well as on their reutilization in several catalytic cycles. Catalyst CuazaBox anchored onto the external surface of MCM-22 and ITQ-2 materials were more active and enantioselective in the cyclopropanation of styrene than the corresponding homogeneous phase reaction run under similar experimental conditions. This is due to the propylation of the acidic aza-Box nitrogen. HMCM-22 was nevertheless the best heterogeneous catalyst. Encapsulation of CuazaBox on post-synthesis modified MCM-22 materials led to low activities and enantioselectivities. But reversal on the stereochemical course of the reaction was observed, probably due to confinement effect. (C) 2013 Elsevier Inc. All rights reserved.por
dc.identifier.citationSILVA, Ana R.; GUIMARAES, Vanessa; CARNEIRO, Liliana; NUNES, Nelson; BORGES, Susana; PIRES, Joao; MARTINS, Angela; CARVALHO, Ana P. - Copper(II) aza-bis(oxazoline) complex immobilized onto ITQ-2 and MCM-22 based materials as heterogeneous catalysts for the cyclopropanation of styrene. Microporous and Mesoporous Materials. ISSN 1387-1811. Vol. 179 (2013), p. 231-241.por
dc.identifier.issn1387-1811
dc.identifier.other10.1016/j.micromeso.2013.05.029
dc.identifier.urihttp://hdl.handle.net/10400.21/2830
dc.language.isoengpor
dc.peerreviewedyespor
dc.publisherElsevier Science BVpor
dc.subjectAnchoringpor
dc.subjectEncapsulationpor
dc.subjectHeterogeneous catalysispor
dc.subjectMCM-22por
dc.subjectITQ-2por
dc.subjectChiral Catalystspor
dc.subjectZeolitespor
dc.subjectLigandspor
dc.subjectSurfacepor
dc.subjectTransformationpor
dc.subjectPerformancepor
dc.subjectAluminumpor
dc.subjectSupportpor
dc.subjectOlefinspor
dc.titleCopper(II) aza-bis(oxazoline) complex immobilized onto ITQ-2 and MCM-22 based materials as heterogeneous catalysts for the cyclopropanation of styrenepor
dc.typejournal article
dspace.entity.typePublication
oaire.citation.conferencePlaceAmsterdampor
oaire.citation.endPage241por
oaire.citation.startPage231por
oaire.citation.titleMicroporous and Mesoporous Materialspor
oaire.citation.volume179por
rcaap.rightsrestrictedAccesspor
rcaap.typearticlepor

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