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Medientyp: E-Artikel Titel: Reactions of Pendant Boryl Groups in Cp–Metal Complexes: Heterocyclic Ring Annelation in a CpIr System Beteiligte: Herrmann, Christoph; Kehr, Gerald; Fröhlich, Roland; Erker, Gerhard Erschienen: Wiley, 2008 Erschienen in: European Journal of Inorganic Chemistry, 2008 (2008) 14, Seite 2273-2277 Sprache: Englisch DOI: 10.1002/ejic.200701166 ISSN: 1434-1948; 1099-0682 Entstehung: Anmerkungen: Beschreibung: AbstractTreatment of (cod)IrCl dimer with Li(allyl)cyclopentadienide gave (C5H4–CH2–CH=CH2)Ir(cod) (11). At 100 °C, 11 isomerizes cleanly into its ring‐conjugated (trans‐CH3–CH=CH–C5H4)Ir(cod) isomer (13). Subsequent addition of HB(C6F5)2 results in the formation of a product (16) that contains an annelated five‐membered borata heterocycle at the Cp ring. This is probably formed by means of a reaction sequence involving regioselective hydroboration, followed by an electrophilic substitution reaction at the Cp ring by the strongly Lewis acidic –B(C6F5)2 group, in which the iridium metal base acts as the proton abstractor. Products 13 and 16 were characterized by X‐ray diffraction. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)