Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 54, Issue 1, Pages 311-314Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201408314
Keywords
dendrimers; ferrocene; homogeneous catalysis; phosphanes; redox-switchable catalysis
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Funding
- Europaischer Sozialfonds im Freistaat Sachsen
- Deutsche Forschungsgemeinschaft (joint DFG-ANR project DENDSWITCH [HE 1376/34-1]
- COST Action [CM1302 SIPs]
- Graduate School BuildMoNa
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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.
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