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Enantioselective epoxidation of unfunctionalized olefins catalyzed by chiral salen Mn(III) catalyst immobilized on zirconium oligostyrenylphosphonate-phosphate

Paper ID Volume ID Publish Year Pages File Format Full-Text
51432 46843 2009 6 PDF Available
Title
Enantioselective epoxidation of unfunctionalized olefins catalyzed by chiral salen Mn(III) catalyst immobilized on zirconium oligostyrenylphosphonate-phosphate
Abstract

A general method for the covalent attachment of chiral salen Mn(III) complex to zirconium oligostyrenylphosphonate-phosphate has been used. The immobilized chiral salen Mn(III) catalyst shows higher chiral induction (ee, 60–70%) compared with the corresponding homogeneous catalyst (ee, 54%) for asymmetric epoxidation of α-methylstyrene with NaClO as oxidant, while the heterogeneous catalyst exhibits relatively low ee values for asymmetric epoxidation of indene. Interestingly, the ee values for the immobilized catalyst with NaClO as oxidant are higher than those for the same catalyst with m-chloroperbenzoic acid as oxidant. This stands in contrast to the literatures reported. The heterogeneous catalyst can be recycled nine times, while the activity will decrease after use in reactions.

Keywords
Chiral salen Mn(III); Heterogeneous catalyst; Zirconium oligostyrenylphosphonate-phosphate; Covalent attachment; Asymmetric epoxidation
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Enantioselective epoxidation of unfunctionalized olefins catalyzed by chiral salen Mn(III) catalyst immobilized on zirconium oligostyrenylphosphonate-phosphate
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Communications - Volume 10, Issue 6, 15 February 2009, Pages 788–793
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us