Unprecedented Bonding of a Coordinated Polyenyl Ligand. Synthesis and Molecular Structures of fac-Trialkyltricarbonyliron Compounds Containing the n3-Nonafluorocycloocta-2,5-diene-1,4,7-triyl Ligand and Its Derivatives

摘要

While hydrocarbon enyl and polyenyl ligands are ubiquitous us is organotransition metal chemistry, (n3pentafluoroallyl)tricarbonylcobalt and the (n3afluorocyclohexenyl)tricarbonyliron anion appear to be the only reported examples of complexes containing perfluorinated enyl ligands. No compounds containing perfluoropolyenyl ligands have been reported. We now report that the perfluorocycloocta-2,5-diene-1,4,7-triyl ligand and its derivatives can be prepared by nucleophilic attack on coordinated octafluorocyclooctatetraene. These perfluoropolyenyl ligands bind to the metal via three sigma-bonds rather than through the Pi-system of the polyenyl ring, affording the first examples of trialkyltricarbonylmetal complexes. Keywords: Reprints, Ligands, Polymers, Cyclic compounds. (mgm)