报告人：Thomas Braun

主持人：储玲玲 特聘研究员

时间：2024年10月30日（星期三）10:00

地点：复合材料创新协同大楼第二报告厅

报告人介绍：Professor Thomas Braun studied chemistry at the Julius-Maximilians-Universität Würzburg and received his Ph.D. under the supervision of Helmut Werner. After a short stay with Pierre Dixneuf (Rennes, France) and postdoctoral work with Robin Perutz (York, UK), he obtained his habilitation at the University of Bielefeld (mentor: Peter Jutzi). In 2007, he was appointed Professor of Inorganic Chemistry at the Humboldt-Universität zu Berlin, where he is full professor since 2011. Thomas Braun received the Wöhler Award for Young Scientists in 2006, the RSC Fluorine Chemistry Prize in 2007, and the Fluorine Publication prize of the Fluorine Subject Group of the German Chemical Society in 2015. From 2010 to 2012 he served as the chair of the GDCh Fluorine Chemistry division and was from 2009 to 2018 vice-chair of the DFG (German Research Foundation) Research Training Group GRK 1582 Fluorine as the Key Element. Currently he is vice-speaker of the DFG Collaborative Research Center Fluorospecific Interactions: Fundamentals and Applications, and is also Executive Committee Member of the Fluorine Division of the ACS. The major interests of Thomas Braun are in organometallic and fluorine chemistry as well as coordination chemistry with an emphasis on the catalytic activation of small molecules. This involves C−F and C−H bond activation reactions, but as well the chemistry of sulfur fluorides. He also has an interest in heterogeneous catalysis.

报告摘要：Useful methods for a metal-mediated derivatization of fluorinated molecules are often based on C−H or C−F bond activation reactions. In order to make C−F bond cleavage steps feasible, other strong element−fluorine bonds such as H−F or Si−F bonds have to be formed. Thus, at rhodium, highly reactive Rh(I) species such as [Rh(H)(PEt3)3], [Rh{Si(OEt)3}(PEt3)3]or [Rh(GePh3)(PEt3)3]can serve as suitable tools to induce a C−F activation step, but also C−H activation reactions. Stoichiometric studies at the rhodium complexes as well as initial catalytic reactions for the hydrodefluorination, silylation, germylation and C−C coupling reactions of olefinic precursors will be described (Figure).