Synthesis and characterization of bidentate NHC-Pd complexes and their role in amination reactions


Demir S., ÖZDEMİR İ. , Cetinkaya B., ARSLAN H., VanDerveer D.

POLYHEDRON, cilt.30, ss.195-200, 2011 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 30 Konu: 1
  • Basım Tarihi: 2011
  • Doi Numarası: 10.1016/j.poly.2010.10.015
  • Dergi Adı: POLYHEDRON
  • Sayfa Sayıları: ss.195-200

Özet

The new well-defined and air-stable ortho-xylyl-linked N-heterocyclic carbene (NHC) Pd complexes (2a-d) have been synthesized and characterized by elemental analysis, H-1 NMR, C-13 NMR, IR spectroscopy, and single crystal X-ray diffraction studies. The palladium atom in the complex 2a lies on a crystallographic mirror plane and can be described as having a square-planar coordination environment with the carbene atoms of the benzimidazole rings of the ligand occupying two coordination sites in cis positions. Two further coordination sites are occupied by chloride ligands. The benzimidazole rings are connected to each other by an ortho-xylyl bridge. The catalytic activity of these palladium complexes has been tested in the coupling reactions of various N-containing substrates with bromobenzene. A preliminary catalytic study shows that the bis(NHC)-Pd complexes are highly active in the Buchwald-Hartwig amination reaction. (C) 2010 Elsevier Ltd. All rights reserved.