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Zirconium phosphonates-supported chiral Mn (III) Salen complexes for the asymmetric epoxidation of unfunctionalized olefins

Paper ID Volume ID Publish Year Pages File Format Full-Text
51348 46839 2009 6 PDF Available
Title
Zirconium phosphonates-supported chiral Mn (III) Salen complexes for the asymmetric epoxidation of unfunctionalized olefins
Abstract

The mesoporous zirconium phosphonates-supported Mn (III) Salen complexes (1a–e) with the different lengths of alkylsulfonic linkage (n = 2–6) and the loading amount of 0.041–0.059 mmol g−1 (based on Mn) were prepared and used as heterogeneous catalysts in the asymmetric epoxidation of styrene, α-methylstyrene and indene. The ee values significantly increased with the linkage length (n) from 2 to 6 only in the case of indene with the m-CPBA/NMO as an oxidant system, in all other shown cases the ee values are not significantly influenced by the linkage length (n). In m-CPBA/NMO system, the comparable ee values to the homogeneous Mn (III) Salen complex 1 were achieved. Due to the confined effect originating from the nanopores of zirconium phosphonates, the heterogeneous Mn (III) Salen complexes (1a–e) gave twice (84–88%ee) as many as ee values of homogeneous Mn (III) Salen complex 1 (49%ee) in the NaClO/PPNO system.

Keywords
Heterogeneous catalysis; Enantioselective epoxidation; Zirconium phosphonate; Unfunctional olefin; Mn (III) Salen complex
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Zirconium phosphonates-supported chiral Mn (III) Salen complexes for the asymmetric epoxidation of unfunctionalized olefins
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Communications - Volume 10, Issue 8, 30 March 2009, Pages 1261–1266
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