Asymmetric epoxidation of alkenes by a chiral manganese(III) salen complex anchored onto a functionalised hexagonal mesoporous silica

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Publication details

Title of host publicationMolecular Sieves: From Basic Research to Industrial Applications
DatePublished - 2005
Pages1525-1532
Number of pages8
PublisherElsevier Press
Original languageEnglish
ISBN (Print)978-0-444-52083-8

Publication series

NameStudies in Surface Science and Catalysis
PublisherElsevier
Number2
Volume158

Abstract

A Jacobsen-type catalyst was anchored onto an amine functionalised hexagonal mesoporous silica (HMS) through the diimine bridge fragment of the complex. The new heterogeneous catalyst, as well as the precedent materials, were characterised by elemental analyses, FTIR-DRIFT, UV-vis, porosimetry and XPS which showed that the complex was successfully anchored. This material was active in the epoxidation of styrene and alpha-methylstyrene in dichloromethane at 0 degrees C using, respectively, m-CPBA/NMO and NaOCI. With the former substrate no asymmetric induction was found in the epoxide, whereas with the latter substrate higher %ee was found than in homogeneous phase. Using the latter experimental conditions, catalyst reuse led to no significant loss of catalytic activity and enantioselectivity.

    Research areas

  • (SALEN)MANGANESE(III) COMPLEXES, ENANTIOSELECTIVE EPOXIDATION, CATALYSIS, STYRENE

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