Impact of dendrimer density on epoxide enantioselectivity over an immobilised chiral salen complex

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Abstract

PAMAM dendrimers were grown on two silica supports with different surface dendrimer densities and subsequently used to immobilise a chiral salen complex. The low density supported sample resulted in the complex exhibiting the ability to act enantioselectively while this effect was all but lost for sample based on the high density support. The negative effect of the high density material was attributed to undesired interactions between the complex and the support. An understanding of this effect allowed partial recovery of enantioselectivity for the high density support based catalysts through operating at higher temperatures. (C) 2013 Elsevier B.V. All rights reserved.

Original languageEnglish
Pages (from-to)159-163
Number of pages5
JournalCatalysis Communications
Volume43
Early online date9 Oct 2013
DOIs
Publication statusPublished - 5 Jan 2014

Keywords

  • dendrimers
  • immobilised salens
  • epoxidation
  • unfunctionalized olefins
  • asymmetric epoxidation
  • molecular-oxygen
  • (salen)manganese complexes
  • mesoporous materials
  • effective catalysts
  • MN(III) complex
  • MN
  • alkenes
  • silica

Cite this

@article{6e61ba9082104bebbe906be99eb1aa6e,
title = "Impact of dendrimer density on epoxide enantioselectivity over an immobilised chiral salen complex",
abstract = "PAMAM dendrimers were grown on two silica supports with different surface dendrimer densities and subsequently used to immobilise a chiral salen complex. The low density supported sample resulted in the complex exhibiting the ability to act enantioselectively while this effect was all but lost for sample based on the high density support. The negative effect of the high density material was attributed to undesired interactions between the complex and the support. An understanding of this effect allowed partial recovery of enantioselectivity for the high density support based catalysts through operating at higher temperatures. (C) 2013 Elsevier B.V. All rights reserved.",
keywords = "dendrimers, immobilised salens, epoxidation, unfunctionalized olefins, asymmetric epoxidation, molecular-oxygen, (salen)manganese complexes, mesoporous materials, effective catalysts, MN(III) complex, MN, alkenes, silica",
author = "McCue, {Alan John} and Urgast, {Dagmar S.} and Wells, {Richard P. K.} and Anderson, {J. A.}",
note = "Acknowledgements We thank the Carnegie Trust for the Universities of Scotland for the award of a studentship and to Dr and Mrs G. Siddall for the award of a travel scholarship (to AJM) and to Prof. H. Alper, University of Ottawa, for hosting the visit.",
year = "2014",
month = "1",
day = "5",
doi = "10.1016/j.catcom.2013.09.018",
language = "English",
volume = "43",
pages = "159--163",
journal = "Catalysis Communications",
issn = "1566-7367",
publisher = "Elsevier",

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TY - JOUR

T1 - Impact of dendrimer density on epoxide enantioselectivity over an immobilised chiral salen complex

AU - McCue, Alan John

AU - Urgast, Dagmar S.

AU - Wells, Richard P. K.

AU - Anderson, J. A.

N1 - Acknowledgements We thank the Carnegie Trust for the Universities of Scotland for the award of a studentship and to Dr and Mrs G. Siddall for the award of a travel scholarship (to AJM) and to Prof. H. Alper, University of Ottawa, for hosting the visit.

PY - 2014/1/5

Y1 - 2014/1/5

N2 - PAMAM dendrimers were grown on two silica supports with different surface dendrimer densities and subsequently used to immobilise a chiral salen complex. The low density supported sample resulted in the complex exhibiting the ability to act enantioselectively while this effect was all but lost for sample based on the high density support. The negative effect of the high density material was attributed to undesired interactions between the complex and the support. An understanding of this effect allowed partial recovery of enantioselectivity for the high density support based catalysts through operating at higher temperatures. (C) 2013 Elsevier B.V. All rights reserved.

AB - PAMAM dendrimers were grown on two silica supports with different surface dendrimer densities and subsequently used to immobilise a chiral salen complex. The low density supported sample resulted in the complex exhibiting the ability to act enantioselectively while this effect was all but lost for sample based on the high density support. The negative effect of the high density material was attributed to undesired interactions between the complex and the support. An understanding of this effect allowed partial recovery of enantioselectivity for the high density support based catalysts through operating at higher temperatures. (C) 2013 Elsevier B.V. All rights reserved.

KW - dendrimers

KW - immobilised salens

KW - epoxidation

KW - unfunctionalized olefins

KW - asymmetric epoxidation

KW - molecular-oxygen

KW - (salen)manganese complexes

KW - mesoporous materials

KW - effective catalysts

KW - MN(III) complex

KW - MN

KW - alkenes

KW - silica

UR - http://www.scopus.com/inward/record.url?scp=84886070581&partnerID=8YFLogxK

U2 - 10.1016/j.catcom.2013.09.018

DO - 10.1016/j.catcom.2013.09.018

M3 - Article

VL - 43

SP - 159

EP - 163

JO - Catalysis Communications

JF - Catalysis Communications

SN - 1566-7367

ER -