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Rhodium(III) and Iridium(III) Complexes with Quinolyl‐Functionalized Cp Ligands: Synthesis and Catalytic Hydrogenation Activity
Author(s) -
Kohl Gerald,
Pritzkow Hans,
Enders Markus
Publication year - 2008
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.200800217
Subject(s) - chemistry , rhodium , iridium , denticity , medicinal chemistry , catalysis , ligand (biochemistry) , asymmetric hydrogenation , moiety , cationic polymerization , quinoline , stereochemistry , metal , polymer chemistry , organic chemistry , enantioselective synthesis , biochemistry , receptor
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)