Abstract
Reaction of lutidine-bridged dibenzimidazolium dibromides 1 - 4 with palladium acetate gives pincer-type palladium complexes of the type [Pd(L)Br]Br [5]Br-[8]Br. Crystals suitable for an X-ray diffraction study have been obtained by slow evaporation of the solvent from dichloromethane/methanol solutions of [7]Br and [8]Br. The crystal structure of [7]+ reveals a pincer topology of the cationic complex with a distorted square-planar coordination geometry at the metal center. From a solution of complex [8]Br, a dinuclear byproduct [9]+ was obtained with two bis(benzimidazolin- 2-ylidene) ligands coordinating in a bridging fashion. The pincer-type palladium complexes [5]Br- [8]Br were tested as precatalysts in Suzuki coupling reactions.
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