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Catalytic c−h activation of hydrocarbons by rhodium(I) and iridium(I) complexes with hemilabile quinolyl-cp ligands

The rhodium(I) and iridium(I) complexes 3a−6a contain the hemilabile Cp-quinoline chelate ligands 1 and 2, respectively, where the hard nitrogen donor does not displace the good acceptor ligand ethylene. After irradiation with visible light, intensely colored complexes are obtained, where the N-dono...

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Hauptverfasser: Kohl, Gerald (VerfasserIn) , Rudolph, Ralph (VerfasserIn) , Pritzkow, Hans (VerfasserIn) , Enders, Markus (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: 2005
In: Organometallics
Year: 2005, Jahrgang: 24, Heft: 20, Pages: 4774-4781
ISSN:1520-6041
DOI:10.1021/om050438d
Online-Zugang:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1021/om050438d
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Verfasserangaben:Gerald Kohl, Ralph Rudolph, Hans Pritzkow, and Markus Enders

MARC

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520 |a The rhodium(I) and iridium(I) complexes 3a−6a contain the hemilabile Cp-quinoline chelate ligands 1 and 2, respectively, where the hard nitrogen donor does not displace the good acceptor ligand ethylene. After irradiation with visible light, intensely colored complexes are obtained, where the N-donor coordinates to the metal centers. Depending on the metal atom and on the substitution pattern at the Cp rings, the mono-ethene complex with N-metal coordination can be observed spectroscopically (e.g., 3b) or C−H addition products are probable intermediates. The iridium complex 6a is able to activate the aliphatic C−H bond in cyclohexane. With the rhodium complex 5a as the precatalyst, catalytic H/D exchange reactions have been performed with olefinic substrates. With linear α-olefins a fast double-bond isomerization dominates. The hemilabile ligands stabilize the catalytically active metal complexes without suppressing their activity significantly. 
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