Homogeneous gold catalysis using complexes recovered from waste electronic equipment
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Published version
Author(s)
Type
Journal Article
Abstract
Despite the greater awareness of elemental sustainability and the benefits of the circular economy concept, much waste electrical and electronic equipment (WEEE) is still destined for landfill. Effective methods for valorizing this waste within our society are therefore imperative. In this contribution, two gold(III) complexes obtained as recovery products from WEEE and their anion metathesis products were investigated as homogenous catalysts. These four recovery products were successfully applied as catalysts for the cyclization of propargylic amides and the condensation of acetylacetone with o-iodoaniline. Impressive activity was also observed in the gold-catalyzed reaction between electron-rich arenes (2-methylfuran, 1,3-dimethoxybenzene, and azulene) and α,β-unsaturated carbonyl compounds (methyl vinyl ketone and cyclohexenone). These recovered compounds were also shown to be effective catalysts for the oxidative cross-coupling reaction of aryl silanes and arenes. When employed as Lewis acid catalysts for carbonyl-containing substrates, the WEEE-derived gold complexes could also be recovered at the end of the reaction and reused without loss in catalytic activity, enhancing still further the sustainability of the process. This is the first direct application in homogeneous catalysis of gold recovery products sourced from e-waste.
Date Issued
2022-12-05
Date Acceptance
2022-11-03
Citation
ACS Sustainable Chemistry and Engineering, 2022, 10 (48), pp.15726-15734
ISSN
2168-0485
Publisher
American Chemical Society
Start Page
15726
End Page
15734
Journal / Book Title
ACS Sustainable Chemistry and Engineering
Volume
10
Issue
48
Copyright Statement
© 2022 The Authors. Published by American Chemical Society. This work is licensed under a Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/).
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Publication Status
Published
Date Publish Online
2022-11-17