fulltext.study @t Gmail

Manganese(III) complexes of novel chiral unsymmetrical BINOL-Salen ligands: Synthesis, characterization, and application in asymmetric epoxidation of olefins

Paper ID Volume ID Publish Year Pages File Format Full-Text
41137 45878 2012 7 PDF Available
Title
Manganese(III) complexes of novel chiral unsymmetrical BINOL-Salen ligands: Synthesis, characterization, and application in asymmetric epoxidation of olefins
Abstract

Several chiral unsymmetrical and C2-symmetric Mn(III)-BINOL-Salen complexes have been designed, synthesized and applied to the asymmetric epoxidation of non-functionalized alkenes. Experimental results show these complexes are effective in the catalytic asymmetric epoxidation of alkenes. The catalyst 4c exhibited better enantioselectivity and reactivity than the catalysts 4b and 4a due to the steric effect of the ligands. To understand the synergistic effect of the two different chiral centers in the catalyst, the catalyst 6a has been investigated. By comparison of the enantioselectivity obtained by using 4c and 6a, respectively, the positive experimental results have proved that the chiral stereogenic centers in the diaminocyclohexane-derived catalysts played an important role in the current enantioselective epoxidation. Besides, the comparison of enantioselectivity displayed by 4c and 7a further demonstrates the significant influence through the cooperation of steric factors and chiral centers in catalyst.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (144 K)Download as PowerPoint slideHighlights► A series of Mn(III)-BINOL-Salen complexes have been designed and synthesized. ► The catalysts have been investigated for asymmetric epoxidation of alkenes. ► The positive experimental results showed these complexes are excellent catalysts. ► High or excellent enantioselectivity with good yield has been gotten by catalyst.

Keywords
Chiral manganese(III) complex; Unsymmetrical BINOL-Salen; Asymmetric catalysis; Epoxidation; Olefins
First Page Preview
Manganese(III) complexes of novel chiral unsymmetrical BINOL-Salen ligands: Synthesis, characterization, and application in asymmetric epoxidation of olefins
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
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volumes 415–416, 16 February 2012, Pages 40–46
Authors
, , , , , , , , ,
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