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Green Processing and Synthesis

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Volume 1, Issue 3


Carbon coated magnetic nanoparticles as supports in microwave-assisted palladium catalyzed Suzuki-Miyaura couplings

Sebastian Wittmann / Jean-Pierre Majoral / Robert N. Grass
  • Institute of Chemical and Bioengineering, Department of Chemistry and Applied Biosciences, ETH Zürich, Wolfgang-Pauli-Strasse 10, 8093 Zürich, Switzerland
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Wendelin J. Stark
  • Institute of Chemical and Bioengineering, Department of Chemistry and Applied Biosciences, ETH Zürich, Wolfgang-Pauli-Strasse 10, 8093 Zürich, Switzerland
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Oliver Reiser


A palladium bis-N-heterocyclic carbene complex was immobilized on polystyrene modified, magnetic carbon coated iron nanoparticles and evaluated in Suzuki-Miyaura cross-coupling reactions under conventional and microwave heating. Under the latter conditions, both aryl bromides and aryl chlorides could be employed as substrates at low loading of catalyst (0.2 mol%), which could be readily recovered by an external magnet and reused in at least four cycles. As a possible deactivation pathway of the catalyst, the formation of palladium nanoparticles in the course of the reaction that became encapsulated in the polystyrene matrix of the support is suggested.

Keywords: magnetic nanoparticles; microwave irradiation; palladium-N-heterocyclic carbene catalysts; recyclable catalyst; Suzuki-Miyaura coupling

About the article

Sebastian Wittmann

Sebastian Wittmann studied Chemistry at the University of Regensburg and completed his PhD in 2012 in Prof. Reiser’s group. He is a member of the International Graduate School NANOCAT of the Elitenetzwerk Bavaria, Germany.

Jean-Pierre Majoral

Jean-Pierre Majoral is an Emeritus Director of Researches Exceptional Class at CNRS. After his PhD, he worked as a postdoc with A. Katritzky (Norwich, UK). He became the Director of Research at CNRS in 1978. He was in charge of the French-Polish European Institute (LEA, 2000–2008). His research interest is mainly focused on main group elements, especially phosphorus in different areas of chemistry. Presently, he is involved in the preparation and properties of dendrimers and hyperbranched polymers with emphasis on their applications in different fields ranging from biology, nanomaterials and catalysis. He is a member of several academies of science worldwide and has received various international awards. He is the author of approximately 500 publications and 40 patents.

Robert N. Grass

Robert Grass is a Senior Scientist at ETH Zurich, Switzerland. He studied Chemical Engineering at ETH Zurich where he also completed his PhD in the Prof. Stark’s group in 2007. Robert is a co-founder and CEO of TurboBeads Llc, a spin-off company commercializing magnetic nanobeads.

Wendelin J. Stark

Wendelin J. Stark received his Master’s in Chemistry in 2000 followed by a PhD in Mechanical Engineering in 2002 from ETH Zurich, Switzerland. He founded the Functional Materials Laboratory in 2004 and pursues application-oriented research at the interface of chemistry with material science and medicine. He has co-founded four spin-off companies and authored over 150 papers and 20 patents.

Oliver Reiser

Oliver Reiser is Professor of Organic Chemistry at the University of Regensburg. After his PhD at the University of Hamburg (A. de Meijere), he worked as a postdoc at the IBM Research Center, San Jose, CA, USA (R.D. Miller) and at Harvard University, Boston, MA, USA (D.A. Evans). Having started his independent academic career as an assistant professor at the University of Göttingen (1992–1996), he became associate professor at the University of Stuttgart (1997) before he moved to his current position at Regensburg. His research interests are centered around stereoselective synthesis and catalysis, natural products and peptide foldamers. He is the author of approximately 200 publications.

Corresponding author

Received: 2012-04-29

Accepted: 2012-05-04

Published in Print: 2012-06-01

Citation Information: , Volume 1, Issue 3, Pages 275–279, ISSN (Online) 2191-9550, ISSN (Print) 2191-9542, DOI: https://doi.org/10.1515/gps-2012-0036.

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