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Dioxomolybdenum(VI) complexes containing chiral oxazolines applied in alkenes epoxidation in ionic liquids: A highly diastereoselective catalyst

Paper ID Volume ID Publish Year Pages File Format Full-Text
41598 45894 2011 8 PDF Available
Title
Dioxomolybdenum(VI) complexes containing chiral oxazolines applied in alkenes epoxidation in ionic liquids: A highly diastereoselective catalyst
Abstract

New monometallic dioxomolybdenum complexes, 2 and 3, containing the bis(oxazoline) B and the oxazolinyl-pyridine C respectively, have been prepared and fully characterized both in solution and solid state, including the single-crystal X-ray diffraction analysis for 2, which represents the first structure of a Mo(VI) complex coordinated to a bis(oxazoline). These complexes, together with the bimetallic system 1, were used as catalytic precursors for alkenes epoxidation (cyclooctene, (R)-limonene, trans-β-methylstyrene) in imidazolium- and pyrrolidinium-based ionic liquids, exhibiting a high chemoselectivity towards the epoxide formation, mainly for cyclooctene and (R)-limonene epoxidation, without formation of the corresponding diols. In [BMP][NTf2] (BMP = butyl methyl pyrrolidinium; NTf2 = bis(trifluoromethanesulfonyl)amide), complex 1 exclusively gave trans(R)-limonene 1,2-epoxide, while monometallic catalytic systems led to a low diastereoselectivity. 95Mo NMR studies helped to understand the catalytic behaviour of 1 and 2 in ionic liquid medium.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (107 K)Download as PowerPoint slideHighlights► Dioxomolybdenum(VI) complexes applied in alkenes epoxidation in ionic liquids. ► Pyrrolidinium-based ionic liquid leads to stable oxazoline-based catalytic systems. ► Diastereospecific bimetallic catalyst in pyrrolidium-based ionic liquids. ► 13C and 95Mo NMR studies evidence Mo-NHC bond formation in imidazolium IL.

Keywords
Oxomolybdenum(VI) complexes; Oxazoline; Olefin epoxidation; Ionic liquids; Diastereoselectivity
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Dioxomolybdenum(VI) complexes containing chiral oxazolines applied in alkenes epoxidation in ionic liquids: A highly diastereoselective catalyst
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 398, Issues 1–2, 15 May 2011, Pages 88–95
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