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TEMPO Supported on Magnetic C/Co‐Nanoparticles: A Highly Active and Recyclable Organocatalyst
Author(s) -
Schätz Alexander,
Grass Robert N.,
Stark Wendelin J.,
Reiser Oliver
Publication year - 2008
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.200801001
Subject(s) - chemistry , magnetic nanoparticles , nanoparticle , organocatalysis , combinatorial chemistry , organic chemistry , nanotechnology , catalysis , materials science , enantioselective synthesis
Abstract 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.