Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10244552 | Journal of Catalysis | 2005 | 7 Pages |
Abstract
We prepared new chiral Mn(III) salen complexes 1â²-4â² immobilized on pyridine N-oxide-modified MCM-41 through the axial coordination. Epoxidation of styrene and 4-chlorostyrene with the use of these complexes as catalysts in the presence of NaOCl was found to proceed enantioselectively (ee, 62-69%) at 0â°C in 8-12 h, which is a significantly higher enantioselectivity than that observed for their homogeneous counterparts (ee, 36-51%). These catalysts were also effective for the relatively bulkier alkenes, such as indene and 2,2-dimethylchromene, and have shown a reactivity (82-98%) and an enantioselectivity (69-92%) similar to those observed for their homogeneous system. The catalysts could be recycled several times without loss of performance.
Related Topics
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Authors
Rukhsana I. Kureshy, Irshad Ahmad, Noor-ul H. Khan, Sayed H.R. Abdi, Surendra Singh, Preti H. Pandia, Raksh V. Jasra,