Poulain, Aurélie Neels, Antonia Albrecht, Martin 2009-03-12 Oxidative addition of 2-bromopyridine derivatives containing a potentially chelating donor group E (E = NMe₂, SMe, SPh) to palladium(0) gives <i>C</i>,<i>E</i>-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, <i>N</i>-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. application/pdf https://folia.unifr.ch/global/documents/301157 https://folia.unifr.ch/documents/301157/files/albrecht_pcc.pdf eng info:eu-repo/semantics/altIdentifier/doi/10.1002/ejic.200801155 info:eu-repo/semantics/openAccess License undefined European Journal of Inorganic Chemistry. - 2009, no. 13, p. 1871 - 1881 Palladium Carbene ligands Metallacycles Heterogeneous catalysis Cross-coupling info:eu-repo/classification/udc/54 Palladium complexes containing potentially chelating pyridylidene-type carbene ligands http://purl.org/coar/resource_type/c_6501