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Rhodium(III) and Iridium(III) Complexes with Quinolyl-Functionalized Cp Ligands: Synthesis and Catalytic Hydrogenation Activity

✍ Scribed by Gerald Kohl; Hans Pritzkow; Markus Enders

Publisher: John Wiley and Sons
Year: 2008
Tongue: English
Weight: 203 KB
Volume: 2008
Category: Article
ISSN: 1434-1948
DOI: 10.1002/ejic.200800217

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✦ Synopsis

Abstract

Bis(ethene) complexes of rhodium(I) and iridium(I) with 8‐quinolylcyclopentadienyl ligands (Cp^Q^ and Cp^Q^*) were oxidized by a photochemically induced reaction with chlorine‐containing solvents or by treatment with iodine. Upon this oxidation, the quinoline ring rotates and the N donor coordinates to the metal centers. Substitution of the halogenido ligands through acetato groups leads to highly soluble derivatives, in which the acetate moiety acts as a monodentate or bidentate ligand. The new Rh complexes were evaluated as catalysts for the hydrogenation of 1‐hexene. The coordinatively saturated complexes show hydrogenation activity without the necessity of external bases. The catalytic activity is highest for the cationic complex [Cp^Q^*Rh(O~2~CCH~3~)]^+^PF~6~^–^ (6b), which contains a bidentate acetato ligand. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)

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