A novel family of dimeric palladium complexes bearing 2-imidazolyl ligands as masked protic NHCs is reported and shown to be a highly effective general platform in diverse catalytic cross-coupling reactions. The rigidity and conformation of the ligand scaffold was readily modified via tethering of the 2-imidazolyl moiety to diamine ligands, resulting in significant changes in catalytic activity. In optimal conditions, Suzuki-Miyaura, Heck and copper-free Sonogashira-type couplings can all be performed in excellent yields using only 0.1 mol% of catalyst, in aqueous or alcoholic solvents and mild conditions. The bifunctional character of these new complexes has been studied and is proposed to be responsible for their high catalytic activity.

Bifunctional palladium complexes bearing masked protic NHC ligands as highly active catalysts for sustainable cross-coupling reactions

2019 Fall National Meeting

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