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From recovered metal waste to high-performance palladium catalysts

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Title: From recovered metal waste to high-performance palladium catalysts
Authors: Wilton-Ely, JD
White, A
Jantan, K
Chan, K
Kwok, C
Serpe, A
Marchio, L
Deplano, P
Item Type: Journal Article
Abstract: The catalytic activity of a series of neutral and cationic, homo- and heteroleptic, mono- and bimetallic palladium(II) compounds based on dithiocarbamate and dithiooxamide S,S-donor ligands is described. High activity was observed in the regio- and chemo-selective C–H functionalization of benzo[h]quinoline to 10-alkoxybenzo[h]quinoline and 8-methylquinoline to 8-(methoxymethyl)quinoline in the presence of the oxidant PhI(OAc)2. The best performance was found for [Pd(Me2dazdt)2]I6 (Me2dazdt = N,N′-dimethyl-perhydrodiazepine-2,3-dithione), [PdI2(Me2dazdt)] and [Pd(Cy2DTO)2]I8 (Cy2DTO = N,N′-dicyclohexyl-dithiooxamide) which are all obtained directly as products of sustainable Pd-metal leaching processes used to recover palladium from scrap metal. These compounds provided almost quantitative yields under milder conditions (50 °C, 1–3 mol% Pd loading) and much shorter reaction times (1–3 h) than reported previously. These results illustrate how the complexes obtained from the selective and sustainable recovery of Pd from automotive heterogeneous Three Way Catalysts (TWC) can be employed directly in homogeneous catalysis, avoiding further metal recovery steps and valorising the metal complex itself in a ‘circular economy’ model.
Issue Date: 20-Nov-2017
Date of Acceptance: 8-Nov-2017
URI: http://hdl.handle.net/10044/1/53412
DOI: https://dx.doi.org/10.1039/c7gc02678a
ISSN: 1463-9262
Publisher: Royal Society of Chemistry
Start Page: 5846
End Page: 5853
Journal / Book Title: Green Chemistry
Volume: 19
Copyright Statement: © The Royal Society of Chemistry 2017
Sponsor/Funder: The Leverhulme Trust
Funder's Grant Number: RPG-2012-634
Keywords: Science & Technology
Physical Sciences
Chemistry, Multidisciplinary
GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY
Chemistry
Science & Technology - Other Topics
OXIDATION AGENT
COMPLEXES
DISSOLUTION
POWERFUL
PLATINUM
REAGENTS
PD
03 Chemical Sciences
Organic Chemistry
Publication Status: Published
Appears in Collections:Chemistry
Catalysis and Advanced Materials
Faculty of Natural Sciences



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