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A simple one-pot synthesis of Jacobson–Katsuki type chiral Mn(III)–salen catalyst immobilized in silica by sol–gel process and applications in asymmetric epoxidation of alkenes

Paper ID Volume ID Publish Year Pages File Format Full-Text
51777 46853 2008 4 PDF Available
Title
A simple one-pot synthesis of Jacobson–Katsuki type chiral Mn(III)–salen catalyst immobilized in silica by sol–gel process and applications in asymmetric epoxidation of alkenes
Abstract

Salen ligand synthesized from (1R,2R)-(-)-1,2-diaminocyclohexane and 2-hydroxy-3(3-triethoxysilyl-propyl)-benzaldehyde has been used as manganese chelate for the immobilization of the catalytic site. Sol–gel hydrolysis and polycondensation of this chelate with ten equivalents of tetraethyl orthosilicate produced the heterogeneous catalyst. This catalyst is active in enantioselective epoxidations of alkenes in 61–76% yield and 54–86% e.e., using sodium hypochlorite as the primary oxidant. Additionally the immobilized catalyst shows an improvement in the enantioselectivity when compared to the homogeneous Mn(III)–salen analog.

Keywords
Mn(III)–salen; Sol–gel; Immobilization; Epoxidation
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A simple one-pot synthesis of Jacobson–Katsuki type chiral Mn(III)–salen catalyst immobilized in silica by sol–gel process and applications in asymmetric epoxidation of alkenes
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Communications - Volume 9, Issue 14, 30 August 2008, Pages 2437–2440
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