Concerted Catalysis by Adjacent Palladium and Gold in Alloy Nanoparticles for the Versatile and Practical [2+2+2] Cycloaddition of Alkynes

A Pd‐Au alloy efficiently catalyzed the [2+2+2] cycloaddition of substituted alkynes. Whereas monometallic Pd and Au catalysts were totally ineffective, Pd‐Au alloy nanoparticle catalysts with a low Pd/Au molar ratio showed high activity to give the corresponding polysubstituted arenes in high yield...

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Published in:Angewandte Chemie International Edition 2018-05, Vol.57 (21), p.6136-6140
Main Authors: Miura, Hiroki, Tanaka, Yumi, Nakahara, Karin, Hachiya, Yuka, Endo, Keisuke, Shishido, Tetsuya
Format: Article
Language:English
Subjects:
[2+2+2] cycloaddition
Alkynes
Aromatic compounds
Catalysis
Catalysts
Cycloaddition
Gold
heterogeneous catalysis
Nanoparticles
Palladium base alloys
Pd-Au alloys
Substitutes
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Summary:A Pd‐Au alloy efficiently catalyzed the [2+2+2] cycloaddition of substituted alkynes. Whereas monometallic Pd and Au catalysts were totally ineffective, Pd‐Au alloy nanoparticle catalysts with a low Pd/Au molar ratio showed high activity to give the corresponding polysubstituted arenes in high yields. A variety of substituted alkynes participated in various modes of cycloaddition under Pd‐Au alloy catalysis. The Pd‐Au alloy catalysts exhibited high air tolerance and reusability. Concerted catalysis by adjacent Pd and Au in alloy nanoparticles realized efficient [2+2+2] cycloaddition of substituted alkynes to give the corresponding polysubstituted arenes in high yields. A variety of alkynes participated in various modes of cycloaddition under Pd‐Au alloy catalysis. The Pd‐Au alloy catalysts exhibited high air tolerance and reusability.
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.201800973