The metallocyclic ring in mononuclear iminoisoindoline-based palladacycle [(κ2-iminoisoidoline)PdCl(PCy3)] (3) can be ring opened by coordination of phosphine to form the trans bis(phosphine) iminoisoindoline-based palladium(II) complex [(η1-iminoisoidoline)PdCl(PCy3)2] (4) where the η1-iminoisoindoline is coordinated only by an Ar-Pd bond. The ring-opened analogue showed significantly higher coupling activity in Suzuki-Miyaura reactions with aryl chlorides than any iminoisoindoline-based palladacycle studied to date. These results are compared to existing mononuclear palladacycles and reported acyclic analogues.
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Li et al. (2024) studied this question.
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