Palladium β-diiminate chemistry: Reactivity towards monodentate ligands and arylboronic acids

Here we report the synthesis and characterization of a series of palladium β-diiminate complexes. Chloro-bridged dimers [Pd(Ar2nacnac)(μ-Cl)]2 (where [Ar2nacnac]− is [(ArNC(CH3))2CH]− with Ar being aryl substituents) can serve as versatile starting materials, and can be cleaved by neutral monodentate ligands (L) to form mononuclear complexes [Pd(Ar2nacnac)(L)Cl], or engage in unusual transmetallation reactions with boronic acids to form tetrapallada-macrocycles. The reactivity of the tetrapallada-macrocyclic complexes towards L-type ligands, as well as the reactivity of Pd(Ar2nacnac)(L)Cl] complexes towards boronic acids was also explored.