fulltext.study @t Gmail

Simple and efficient water soluble thioligands for rhodium and iridium catalyzed biphasic hydrogenation

Paper ID Volume ID Publish Year Pages File Format Full-Text
41447 45889 2011 6 PDF Available
Title
Simple and efficient water soluble thioligands for rhodium and iridium catalyzed biphasic hydrogenation
Abstract

The activity of catalytic systems derived from the interaction between Rh(CO)2acac and [Ir(COD)Cl]2, respectively, with the water soluble thioligands (L)-Cysteine (1) and (S)-Captopril (2), was tested in the aqueous biphasic hydrogenation of some representative α,β-unsaturated compounds as 2-cyclohexen-1-one (I), trans-cinnamaldehyde (V) and [3-(1,3-benzodioxol-5-yl)-2-methylpropenal] (X), precursor of the fragrance Helional® (XI). The precatalyst Rh/Cap was able to hydrogenate cyclohexenone even at low pressure at 60 °C in a neutral medium while Rh/Cy required either higher pressure and temperature or an alkaline medium. The iridium based catalysts, Ir/Cy and Ir/Cap, showed an analogous trend though their activities were lower than those of the related rhodium catalysts. All the catalysts were easily recycled without significant loss of activity. The rhodium catalysts were also used in the hydrogenation of the above aldehydes V and X and their activity was strongly enhanced when ethylene glycol was used as organic solvent or co-solvent.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (180 K)Download as PowerPoint slideHighlights► Rh/Cap and Rh/Cy were efficient hydrogenation catalysts in aqueous biphasic medium. ► Ir/Cy and Ir/Cap were less active than the related rhodium catalysts. ► All the catalysts were easily recycled without significant loss of activity.

Keywords
Rhodium; Iridium; Biphasic hydrogenation; Catalyst; Water soluble ligand
First Page Preview
Simple and efficient water soluble thioligands for rhodium and iridium catalyzed biphasic hydrogenation
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 - Volume 399, Issues 1–2, 31 May 2011, Pages 205–210
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