Synthesis, Characterization, and Reactivity of N-Heterocyclic Carbene Palladium(II) Hydroxide Dimers

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• 作者：Jonathan D. Egbert ; Anthony Chartoire ; Alexandra M. Z. Slawin ; Steven P. Nolan
• 刊名：Organometallics
• 出版年：2011
• 出版时间：September 12, 2011
• 年：2011
• 卷：30
• 期：17
• 页码：4494-4496
• 全文大小：725K
• 年卷期：v.30,no.17(September 12, 2011)
• ISSN：1520-6041

文摘

Palladium hydroxide dimers were prepared by reactions of CsOH with monomeric [Pd(NHC)(畏³-allyl)Cl] starting materials. The dimers represent species proposed as intermediates in important cross-coupling reactions. These complexes were tested for their catalytic activity in Suzuki鈥揗iyaura coupling and Buchwald鈥揌artwig aryl amination. The hydroxide complexes were susceptible to hydrogenolysis on exposure to H₂ gas. Following H₂O elimination and 尾-hydride elimination of an additional cinnamyl ligand, a Pd(0) species is formed which can react with other available ligands.