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

A.R. Silva, K. Wilson, J.H. Clark, C. Freire

Research output: Contribution to journalArticlepeer-review

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 α-methylstyrene in dichloromethane at 0°C using, respectively, m-CPBA/NMO and NaOCl. 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.
Original languageEnglish
Pages (from-to)1525-1532
Number of pages8
JournalStudies in surface science and catalysis
Volume158
Issue numberPart b
DOIs
Publication statusPublished - 2005

Bibliographical note

Proceedings of the 3rd International Zeolite Symposium (3rd FEZA)

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