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Journal article

Palladium complexes containing potentially chelating pyridylidene-type carbene ligands

  • Poulain, Aurélie Department of Chemistry, University of Fribourg, Switzerland
  • Neels, Antonia CSEM Center Suisse d'Electronique et de Microtechnique, Neuchâtel, Switzerland
  • Albrecht, Martin Department of Chemistry, University of Fribourg, Switzerland
    12.03.2009
Published in:
  • European Journal of Inorganic Chemistry. - 2009, no. 13, p. 1871 - 1881
Palladium
Carbene ligands
Metallacycles
Heterogeneous catalysis
Cross-coupling
English Oxidative addition of 2-bromopyridine derivatives containing a potentially chelating donor group E (E = NMe₂, SMe, SPh) to palladium(0) gives C,E-bound pyridylpalladium(II) complexes. Mono-, di-, and polymeric palladium complexes are obtained depending on the type of functionalization at the pyridyl nitrogen. With a lone pair at nitrogen, dimetallic products are isolated, while protonation gives monometallic pyridylidene-type complexes. Remarkably, N-methylation inhibits chelating ligand coordination and a one-dimensional polymer is formed instead. Heck-type arylation of styrene is used as a probe for the catalytic activity of the palladium pyridylidene complexes and reveals moderate activities. Mechanistic studies support a heterogeneous mode of action, including loss of the pyridylidene-type ligand from the metal coordination sphere.
Faculty
Faculté des sciences et de médecine
Department
Département de Chimie
Language
  • English
Classification
Chemistry
License
License undefined
Identifiers
Persistent URL
https://folia.unifr.ch/unifr/documents/301157
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