个人简介

Professor Jun Okuda, born in Osaka/Japan in 1957, received his Dr. rer. nat. degree at the RWTH Aachen University in 1984 with G. E. Herberich and was a Postdoctoral Associate at MIT with R. R. Schrock. After his habilitation at the Technical UniversityMunich under W. A: Herrmann in 1991 he held academic positions at the State University of New York at Albany (as Assistant Professor), the University of Marburg (Professor of Organometallic Chemistry), and of University of Mainz (Full Professor of Inorganic Chemistry), before assuming the Chair of Organometallic Chemistry at the RWTH Aachen University in 2003. He received the Heinz-Maier-Leibnitz Award 1991 by the German Minister of Science and Education and was Fellow of the Japan Society for the Promotion of Science and Iberdrola Visiting Professor in Spain, both in 1996, visiting scholar at the Chinese University of Hong Kong in 2001, at the National University of Taipei in 2002 and distinguished guest professor at the Chinese Academy of Sciences, Institute of Applied Chemistry, Changchun, China in 2010. He has chaired the “XVth Workshop on Rare Earth Elements” in Mainz in 2002 and was Co-Chairman with W. A. Herrmann for the "14th International Symposium on Homogeneous Catalysis" in Munich in 2004 as well as a number of national meetings. Since 2003 he is board member of the Wöhler Division of the German Chemical Society (GDCh) and chairman since 2007. From 1996 to 2003 he served as selection committee member of the Alexander von Humboldt foundation and from 2003 to 2008 he was an elected member of the committee “Molecular Chemistry” of the German Research Foundation (DFG).

研究领域

Metallorganische Chemie

The goal of our research in the area of organometallic chemistry and homogeneous catalysis is to develop efficient methods to synthesize oligomers, macromolecules, and supramolecular aggregates from monomers of petrochemical and renewable feedstocks. In particular, polymeric materials with potential application as new materials are important targets. In order to avoid the use of expensive and toxicologically harmful platinum metals, we focus on the early transition and the rare earth metals. The coordination and organometallic chemistry of these metals is being actively explored, since its knowledge is a prerequisite for the development of efficient catalysts. Polyolefins: Synthesized from simple unsaturated molecules such as ethylene, propylene, and styrene from petroleum, polyolefins are by far the most important, inexpensive and recyclable polymeric material in industry. The synthesis currently involves organometallic catalysts and initiators which have their origin in the epoch making discoveries by Karl Ziegler and Giulio Natta in the 1950s. With the advent of single-site catalysts, new homogeneous polymerization catalysts have been introduced which have the great advantage of being molecular systems. Catalyst design therefore implies ligand construction, metal complex synthesis, and characterization as well as mechanistic studies of activation, propagation, and termination processes. We develop a series of easily modifiable catalyst precursors which have in common as design elements polydentate donor systems (chelate ligands), labile reaction site, and flexible, easily modifiable coordination sphere. Biodegradable Polymers: For the polymerization of heterocyclic monomers such as L-lactide, electrophilic Lewis acids are required to initiate the ring-opening process. In the context of developing new biocompatible and bioresorbable polymers for potentially biomedical applications, we have focused on the use of aluminum and rare earth metal inititators within a structurally well-defined ligand spheres. The rational harnessing of highly Lewis acidic metal centers requires a thorough understanding of the catalysts’ structure and dynamics. New Homogeneous Catalysts: Chemical industry still uses a considerable number of processes which are not optimal technologies when environmental impact and resource efficiency are considered. The generation of wastes such as seemingly harmless salts becomes imcreasingly problematic, when sustainable development is required. Atom efficient chemical reactions such as hydrogenation and hydrometalation require transition metal catalysts which are often related to polymerization catalysts, since commonly C-H and C-C bond forming and splitting reactions play a major role. We are systematically developing new catalyst precursors for activation of dihydrogen, boranes, and silanes with the aim of obtaining practically important olefin transformations. C-H bond activation of saturated hydrocarbons still remains a challenge, but will allow the utilization of new feedstocks based on natural gas (methane). New ways to activate such extremely inert molecules by new organometallic catalysts are being sought. Stereoselective variants of each processes are considered at an early stage in order to allow the synthesis of chiral molecules as useful intermediates for organic and macromolecular synthesis.

近期论文

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Ancillary Ligand Effect on Single-Site Styrene Polymerization: Isospecificity of Group 4 Metal Bis(phenolate) Catalysts. Capachione, C.; Proto, A.; Ebeling, H.; Mülhaupt, R.; Möller, K.; Spaniol, T. P.; Okuda, J. J. Am. Chem. Soc. 2003, 125, 4964-4965 Homogeneous Ethylene Polymerization Catalysts Based on Alkyl Cations of the Rare Earth Metals - Are Dicationic Mono(alkyl) Complexes the Active Species? Arndt, S.; Spaniol, T. P.; Okuda, J. Angew. Chem. Int. Ed. 2003, 42, 5075-5079 An Efficient Method for the Controlled Propylene Oxide-Polymerization: The Significance of Bimetallic Activation in Aluminum Lewis Acids. Braune, W.; Okuda, J. Angew. Chem. Int. Ed. 2003, 43, 65-68 Cationic Yttrium Complexes as Functional Models for 1,3-Diene Polymerization Catalysts. Arndt, S.; Beckerle, K.; Zeimentz, P. M.; Spaniol, T. P.; Okuda, J. Angew. Chem. Int. Ed. 2005, 44, 7473–7477 Highly Heteroselective Ring-Opening Polymerization of rac-Lactide Initiated by Bis(phenolato) Scandium Complexes. Ma, H.; Spaniol, T. P.; Okuda, J. Angew. Chem. Int. Ed. 2006, 45, 7818–7821 Hafnocene Catalyst for Selective Propylene Oligomerization: Efficient Synthesis of 4-Methyl-1-pentene by beta-Methyl Transfer. Suzuki, Y.; Yasumoto, T.; Mashima, K.; Okuda, J. J. Am. Chem. Soc. 2006, 128, 13017-13025 Stereospecific Styrene Enchainment at a Titanium Site within an Helical Ligand Framework: Evidence for the Formation of Homochiral Polystyrene. Beckerle, K.; Manivannan, R.; Lian, B.; Meppelder, G.-J. M.; Raabe, G.; Spaniol, T. P.; Ebeling, H.; Pelascini, F.; Mülhaupt, R.; Okuda, J. Angew. Chem. Int. Ed. 2007, 46, 4790–4793 Rare-Earth Metal Alkyl and Hydride Complexes Stabilized by a Cyclen-Derived [NNNN] Macrocyclic Ancillary Ligand. Ohashi, M., Konkol, M.; Del Rosal, I.; Poteaus, R.; Maron, L.; Okuda, J. J. Am. Chem. Soc. 2008, 130, 6920–6921 Bis(allyl)calcium. Jochmann, P.; Dols, T.; Perrin, L.; Maron, L.; Spaniol, T. P.; Okuda, J. Angew. Chem. Int. Ed. 2009, 48, 5715–5719