Robust acenaphthoimidazolylidene palladium complexes have been demonstrated as highly efficient and general catalysts for Sonogashira cross‐coupling reactions in excellent yields even at 0.01 mol % catalyst loadings in combination with 1 mol % IPr–Cu under mild reaction conditions. The outcomes highlight that, along with the steric bulky aspects, σ‐donor properties of the NHC ligands are also crucial to accelerate the transformations.

中文翻译：

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Sonogashira偶联反应的协同催化体系：N-杂环碳钯和铜配合物的组合

稳健的并咪唑基钯配合物已被证明是Sonogashira交叉偶联反应的高效和通用催化剂，即使在0.01 mol％的催化剂负载量下与1 mol％的IPr–Cu组合，在温和的反应条件下也具有出色的收率。结果表明，除了空间庞大的方面之外，NHC配体的σ供体特性对于加速转化也至关重要。