Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 14, Issue 27, Pages 8262-8266Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.200801001
Keywords
cobalt; heterogeneous catalysis; magnetic nanobeads; nanoparticles; supported catalysts
Categories
Funding
- International Doktorandenkolleg
- NANOCAT (Elitenetzwerk Bayern)
- Deutsche Forschungsgemeinschaft [SPP 1179]
- Fonds der Chemischen Industrie
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TEMPO was grafted on graphene-coated nanobeads with a magnetic cobalt core by using a general applicable click-chemistry protocol. The new heterogeneous CoNP-TEMPO emerged as a highly active catalyst for the chemoselective oxidation of primary and secondary alcohols using bleach as terminal oxidant. The outstanding stability of the C/Co nanoparticles enables the nanopowder to tolerate several TEMPO-mediated iterative oxidation reactions without any significant loss in catalyst activity. Furthermore, the excellent magnetic properties enable the rapid separation and quantitative recycling of CoNP-TEMPO out of the reaction mixture by simple magnetic decantation. The recovered nanoparticles can be subsequently reused without any further purification.
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