title: Redox control of a dendritic ferrocenyl-based homogeneous catalyst.
abstract: The application of a dendrimer in a redox-switchable catalytic process is reported. A monomeric and the corresponding dendritic ferrocenylphosphane ligand were used to develop well-defined controllable catalysts with distinct redox states. The corresponding ruthenium(II) complexes catalyze the isomerization of the allylic alcohol 1-octen-3-ol. By adding a chemical oxidant or reductant, it was possible to reversibly switch the catalytic activity of the complexes. On oxidation, the ferrocenium moiety withdraws electron density from the phosphane, thereby lowering its basicity. The resulting electron-poor ruthenium center shows much lower activity for the redox isomerization and the reaction rate is markedly reduced.
authors.affiliation: Institute of Inorganic Chemistry, Universität Leipzig, Johannisallee 29, 04103 Leipzig (Germany) http://www.uni-leipzig.de/chemie//hh.
authors.forename: Paul
authors.initials: P
authors.lastname: Neumann
authors.forename: Hanna
authors.initials: H
authors.lastname: Dib
authors.forename: Anne-Marie
authors.initials: AM
authors.lastname: Caminade
authors.forename: Evamarie
authors.initials: E
authors.lastname: Hey-Hawkins
keywords: dendrimers; ferrocene; homogeneous catalysis; phosphanes; redox-switchable catalysis