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

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