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Chemistry Seminar Program
Inorganic Chemistry Seminar Tuesday, April 10th Professor Heinz Berke “Ionic Hydrogenation" as an Alternative to Wilkinson Type Catalysis”  4:15pm - 5:15pm Braun Lecture Hall S.G.Mudd Chemistry Building Stanford University This seminar is free and open to the public. All Stanford University Chemistry students are encouraged to attend this special event. About the seminar: „Ionic Hydrogenation“ is defined as the transfer of formally a hydride and a proton to an unsaturated organic compound. The hydride and the proton act as an H2 equivalent and the hydride is normally a ligand of a transition metal complex and the proton is bound to a base. Three cases can be distinguished mechanistically: Hydride before proton transfer, simultaneous hydride and proton transfer and proton before hydride transfer. “Ionic Hydrogenation” catalysis differs from Wilkinson type hydrogenations in that it requires heterolytic splitting of the H2 molecule, while Wilkinson type hydrogenations proceed with H2 oxidative addition, which goes along with homolytic splittng. Hydride before proton transfer requires “hydridic” hydrides displaying a strong polarization of the M-H bond with charge accumulation at the hydrogen atom. Only weakly acidic components are necessary. Proton before hydride transfer requires less “hydridic” hydrides, but stronger acids. For both cases stoichiometric and catalytic examples with non-noble transition metals will be presented. About Berke: H. Berke received his Diploma in Chemistry at the University of Erlangen (Germany) in 1971 and his Ph. D. at the University of Tübingen (Germany) in 1974. From 1974 - 1988 he has been at the University of Konstanz (Germany) with an intermediate stay in the Laboratory of R. Hoffmann, Cornell University, Ithaca (USA) in 1977. In 1981 he finished his Habilitation and in 1983 he was awarded the Heisenberg fellowship from the "Deutsche Forschungsgemeinschaft" and the Dozentenpreis of the Fonds der Chemischen Industrie (Germany). In 1987 he was promoted to a C2 Professor at the University of Konstanz before he joined the University of Zürich (Switzerland) in 1988 as a full professor of Inorganic Chemistry. In 1991 he became director of this institute and stayed at this position till present. H. Berke is member of the editorial boards of the journals Dalton Transactions and Mendelev Communications and is presently president of the Devision of Chemical Research of the Swiss Chemical Society. H. Berke's fundamental research activities cover various fields of organometallic chemistry. Major efforts are devoted to the area of transition metal hydrides, which is related to homogeneous catalysis, in particular homogeneous hydrogenations and hydrosilations. Metal carbon oriented activities concern several catalyses of C-C coupling reactions mediated by transition metal complexes and in addition metallacumulenes, where carbon chained units are sought to space transition metal centers for potential use as single-electron devices. Another research field deals with the archaeometry of ancient, manmade blue and purple pigments. Questions: Please contact Patricia Dwyer at 650-723-4770.
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