2018
DOI: 10.1002/ange.201800973
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Concerted Catalysis by Adjacent Palladium and Gold in Alloy Nanoparticles for the Versatile and Practical [2+2+2] Cycloaddition of Alkynes

Abstract: AP d-Aua lloy efficiently catalyzedt he [2+ +2+ +2] cycloaddition of substituted alkynes.W hereas monometallic Pd and Au catalysts were totally ineffective,P d-Au alloy nanoparticle catalysts with al ow Pd/Au molar ratio showed high activity to give the corresponding polysubstituted arenes in high yields.Avariety of substituted alkynes participated in various modes of cycloaddition under Pd-Au alloyc atalysis. The Pd-Au alloyc atalysts exhibited high air tolerance and reusability.Supportinginformation and the … Show more

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Cited by 12 publications
(5 citation statements)
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“…Bimetallic synergistic effects are often key factors in tuning Pd-or Au-based catalysis. 61,62 To explore the beneficial effect rendered by Pd∧Au nanoarchitectures, identically formulated Au−Pd species were deposited on TiO 2 via two preparation routesPd-impregnation of Au/TiO 2 and loading preformed Au−Pd bimetallic alloy NPs on TiO 2 , serving as a comparison to investigate the effect of Pd location on catalytic performance. Using a simple impregnation−reduction method with NaBH 4 as the reductant, Pd was homogeneously deposited on the Au/TiO 2 surface (denoted as Pd 0.02 −Au/TiO 2 ), and the TEM image of Pd 0.02 −Au/TiO 2 shows that the NP average size is 2.08 nm (Figure S16A).…”
Section: Acs Catalysismentioning
confidence: 99%
“…Bimetallic synergistic effects are often key factors in tuning Pd-or Au-based catalysis. 61,62 To explore the beneficial effect rendered by Pd∧Au nanoarchitectures, identically formulated Au−Pd species were deposited on TiO 2 via two preparation routesPd-impregnation of Au/TiO 2 and loading preformed Au−Pd bimetallic alloy NPs on TiO 2 , serving as a comparison to investigate the effect of Pd location on catalytic performance. Using a simple impregnation−reduction method with NaBH 4 as the reductant, Pd was homogeneously deposited on the Au/TiO 2 surface (denoted as Pd 0.02 −Au/TiO 2 ), and the TEM image of Pd 0.02 −Au/TiO 2 shows that the NP average size is 2.08 nm (Figure S16A).…”
Section: Acs Catalysismentioning
confidence: 99%
“…Supported Pd−Au alloy catalysts were prepared by a colloid immobilization method. 32,33 PVA and NaBH 4 aqueous solution were used as protecting and reducing agents, respectively. More detailed descriptions of the preparation methods are in the Supporting Information.…”
Section: ■ Experimental Sectionmentioning
confidence: 99%
“…These metal nanoparticles are gaining broad research interest in material science and chemistry because they display unusual chemical and physical properties, which are distinct from those of isolated molecule and bulk phase. [19,20] Notably, supported gold catalysts are known for their superior catalytic performance in several homogeneous and heterogeneous reactions, such as oxidation, [21] CÀ C coupling, [22] cycloaddition, [23] and reduction. [24] To afford a bimetallic structure, it essential to support gold nanoparticles on selected metal oxides, even though the support's choice affects the catalyst's performance and durability.…”
mentioning
confidence: 99%