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Recyclable Au0, Ag0 and Au0–Ag0 nanocolloids for the chemoselective hydrogenation of α,β-unsaturated aldehydes and ketones to allylic alcohols

Paper ID Volume ID Publish Year Pages File Format Full-Text
42728 45938 2009 8 PDF Available
Title
Recyclable Au0, Ag0 and Au0–Ag0 nanocolloids for the chemoselective hydrogenation of α,β-unsaturated aldehydes and ketones to allylic alcohols
Abstract

A high-throughput evaluation of polymer-stabilized metal clusters, with varying composition and size, as unpromoted quasihomogeneous catalysts for the amide-phase hydrogenation of α,β-unsaturated aldehydes and ketones, allowed to identify the most appropriate metal clusters to achieve a high selectivity to allylic alcohols. Au0 and Ag0 based nanocolloids proved superior owing to their pronounced preference for CO reduction over CC saturation. Optimization of the metal nanoclusters in terms of size and composition led to exceptionally high allylic alcohol selectivities. These robust metal nanocolloids could be recycled efficiently from the amidic reaction media by solvent-resistant nanofiltration over cross-linked polyimide membranes. The catalytic activity of the optimized bimetallic nanocolloids consisting of alloyed Au and Ag was well preserved in successive hydrogenation runs while the chemoselectivity was unaffected. The wide substrate scope enabled to study the effect of the CCCO substitution pattern on the substrate reactivity and the allylic alcohol selectivity.

Graphical abstractAu0 and Ag0 based nanocolloids emerge as superior quasihomogeneous metal catalysts for the amide-phase hydrogenation of α,β-unsaturated carbonyl compounds, owing to their pronounced preference for CO reduction. Colloidal Au0–Ag0 alloy clusters with optimized composition and size lead to the highest allylic alcohol yields and can be recycled efficiently by solvent-resistant nanofiltration over custom-made polyimide membranes with unaffected hydrogenation chemoselectivity. Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Chemoselective hydrogenation; Unsaturated ketone; Allylic alcohol; Gold; Silver; Quasihomogeneous catalyst; Bimetallic catalyst; Alloy catalyst; Solvent-resistant nanofiltration
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Recyclable Au0, Ag0 and Au0–Ag0 nanocolloids for the chemoselective hydrogenation of α,β-unsaturated aldehydes and ketones to allylic alcohols
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 355, Issues 1–2, 28 February 2009, Pages 176–183
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