Abstract Palladium-N-heterocyclic carbene complexes are widely investigated catalysts in cross-coupling reactions. However, studies about the catalytic activities of bridged bi-metallic complexes are quite rare. Therefore, in this study, anthracene-substituted one mono-metallic and one bridged bi-metallic PEPPSI-type Pd-NHC complexes were synthesized in order to compare their catalytic activities in Suzuki-Miyaura and Mizoroki-Heck reactions. Both complexes were fully characterized by 1H and 13C NMR, LC-MS, IR spectra and elemental analyses. The results of catalytic reactions clearly revealed that mono-metallic complex performs better catalytic activity than bi-metallic analogue in the use of same amount of palladium.

中文翻译：

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桥连双金属与非桥连单金属PEPPSI型钯N-杂环卡宾配合物催化性能比较

摘要 钯-N-杂环卡宾配合物是交叉偶联反应中广泛研究的催化剂。然而，关于桥连双金属配合物催化活性的研究却很少。因此，在本研究中，合成了蒽取代的一种单金属和一种桥接双金属 PEPPSI 型 Pd-NHC 配合物，以比较它们在 Suzuki-Miyaura 和 Mizoroki-Heck 反应中的催化活性。两种配合物均通过 1H 和 13C NMR、LC-MS、IR 光谱和元素分析进行​​了充分表征。催化反应结果清楚地表明，在使用相同量的钯时，单金属配合物比双金属类似物表现出更好的催化活性。