Design of a Heterogeneous Catalyst Based on Cellulose Nanocrystals for Cyclopropanation: Synthesis and Solid-State NMR Characterization
2015 | journal article. A publication with affiliation to the University of Göttingen.
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Design of a Heterogeneous Catalyst Based on Cellulose Nanocrystals for Cyclopropanation: Synthesis and Solid-State NMR Characterization
Liu, J.; Plog, A.; Groszewicz, P. B.; Zhao, L. I.; Xu, Y.; Breitzke, H. & Stark, A. et al. (2015)
Chemistry: a European Journal, 21(35) pp. 12414-12420. DOI: https://doi.org/10.1002/chem.201501151
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Details
- Authors
- Liu, Jiquan; Plog, Andreas; Groszewicz, Pedro Braga; Zhao, L. I.; Xu, Yeping; Breitzke, Hergen; Stark, Annegret; Hoffmann, Rudolf; Gutmann, Torsten; Zhang, Kai ; Buntkowsky, Gerd
- Abstract
- 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.
- Issue Date
- 2015
- Journal
- Chemistry: a European Journal
- Organization
- Fakultät für Forstwissenschaften und Waldökologie ; Burckhardt-Institut ; Abteilung Holztechnologie und Holzwerkstoffe ; Juniorprofessur Holztechnologie und Holzchemie
- ISSN
- 1521-3765
- eISSN
- 0947-6539
- Language
- English