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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 publication | Molecular Sieves: From Basic Research to Industrial Applications |
|---|---|
| Date | Published - 2005 |
| Pages | 1525-1532 |
| Number of pages | 8 |
| Publisher | Elsevier Press |
| Original language | English |
| ISBN (Print) | 978-0-444-52083-8 |
Publication series
| Name | Studies in Surface Science and Catalysis |
|---|---|
| Publisher | Elsevier |
| Number | 2 |
| Volume | 158 |
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.
- (SALEN)MANGANESE(III) COMPLEXES, ENANTIOSELECTIVE EPOXIDATION, CATALYSIS, STYRENE
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