Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 21, Issue 35, Pages 12414-12420Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201501151
Keywords
cellulose; cyclization; nanoparticles; rhodium; supported catalysts
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Funding
- Hessian excellence initiative LOEWE - research cluster SOFT CONTROL
- Deutsche Forschungsgemeinschaft (DFG) [Bu 911-12-2]
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Heterogeneous dirhodium(II) catalysts based on environmentally benign and biocompatible cellulose nanocrystals (CNC-Rh-2) as support material were obtained by ligand exchange between carboxyl groups on the CNC surface and Rh-2(OOCCF3)(4), as was confirmed by solid-state F-19 and C-13 NMR spectroscopy. On average, two CF3COO- groups are replaced during ligand exchange, which is consistent with quantitative analysis by a combination of F-19 NMR spectroscopy and thermogravimetry. CNC-Rh-2 catalysts performed well in a model cyclopropanation reaction, in spite of the low dirhodium(II) content on the CNC surface (0.23 mmolg(-1)). The immobilization through covalent bonding combined with the separate locations of binding positions and active sites of CNC-Rh-2 guarantees a high stability against leaching and allows the recovery and reuse of the catalyst during the cyclopropanation reaction.
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