Molecular Structures and Catalytic Activity of Palladium Complexes Derived from Lutidine-bridged Bis(benzimidazolin-2-ylidene) Ligands

Mareike C. Jahnke, Tania Pape, F. Ekkehardt Hahn
2007 Zeitschrift für Naturforschung. B, A journal of chemical sciences  
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
more » ... rom 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.
doi:10.1515/znb-2007-0308 fatcat:xmakuh7h3rfuxcbmytsdsdwe5a