Palladium complexes containing potentially chelating pyridylidene-type carbene ligands
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Poulain, Aurélie
Department of Chemistry, University of Fribourg, Switzerland
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Neels, Antonia
CSEM Center Suisse d'Electronique et de Microtechnique, Neuchâtel, Switzerland
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Albrecht, Martin
Department of Chemistry, University of Fribourg, Switzerland
Published in:
- European Journal of Inorganic Chemistry. - 2009, no. 13, p. 1871 - 1881
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.
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Faculty
- Faculté des sciences et de médecine
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Department
- Département de Chimie
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Language
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Classification
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Chemistry
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License
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License undefined
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Identifiers
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Persistent URL
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https://folia.unifr.ch/unifr/documents/301157
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