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, sa.1, ss.195-200, 2011 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 30 Sayı: 1
  • Basım Tarihi: 2011
  • Doi Numarası: 10.1016/j.poly.2010.10.015
  • Dergi Adı: POLYHEDRON
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.195-200
  • Anahtar Kelimeler: Chelating N-heterocyclic carbene, Palladium complexes, C-N bond formation, Catalysis, Amination, N-HETEROCYCLIC CARBENES, PALLADIUM-CATALYZED AMINATION, ARYL HALIDES, C-N, LIGANDS, HYDROAMINATION, REACTIVITY, RHODIUM, PHOSPHINE, OLEFINS
  • İnönü Üniversitesi Adresli: Evet

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.