Mechanism of a Suzuki-Type Homocoupling Reaction Catalyzed by Palladium Nanocubes

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• 作者：Welman C. Elias ; Aline M. Signori ; Laize Zaramello ; Brunno L. Albuquerque ; Daniela C. de Oliveira ; Josiel B. Domingos
• 刊名：ACS Catalysis
• 出版年：2017
• 出版时间：February 3, 2017
• 年：2017
• 卷：7
• 期：2
• 页码：1462-1469
• 全文大小：538K
• ISSN：2155-5435

文摘

The trans-2-phenylvinylboronic acid homocoupling reaction catalyzed by palladium nanocubes (Pd-NCs) was investigated by kinetics, spectroscopy, and poisoning experiments. The reaction was evidenced to be sensitive to the presence of the base, which acts synergistically with the substrate molecules and assists the leaching of Pd oxide (PdO_x) species to the reaction medium. This species catalyzes the homocoupling reaction through the formation of Pd–O_x–B(OH)₂R pretransmetalation intermediates, via coordination with the vinylboronic acid molecules, involving an oxo-palladium-type interaction. The reaction rate was not enhanced by the saturation of the reaction medium with O₂, which is due to the oxidized nature of the Pd-NC surface.