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Oxidative Coupling in the Reaction of TpMe2Ir(2,3-dimethylbutadiene) with Diphenylacetylene

AuthorsPaneque, Margarita ; Martín-Posadas, Cristina; López Poveda, Manuel ; Rendón, Nuria ; Mereiter, Kurt
Isomeric iridacyclopentenes
NMR spectroscopy
X-ray crystallography
Issue Date6-Mar-2007
PublisherAmerican Chemical Society
CitationOrganometallics 26(8): 1900-1906 (2007)
AbstractThe 2,3-dimethylbutadiene complex TpMe2Ir(CH2_C(Me)C(Me)_CH2) (1) reacts with PhCCPh, in C6H12 at 60 °C, with coupling of the diene and the alkyne and formation of compound 2a, which contains an elaborated bicyclic chelating ligand with alkyl and η3-allyl functionalities. NCMe reacts reversibly with 2a, giving rise to a mixture of the isomeric iridacyclopentenes (3) and (4). Complex 2a decomposes in C6H12 at 80 °C to give a complex mixture from which an interesting substituted iridafulvene, 5, has been isolated by chromatography. All these compounds have been characterized by NMR spectroscopy and X-ray crystallography. Possible reaction mechanisms for the formation of these species are discussed.
Description7 páginas, 4 figuras, 5 tablas, esquemas.
Publisher version (URL)http://dx.doi.org/ 10.1021/om060967x
Appears in Collections:(IIQ) Artículos
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