Lecture by Prof. Holger Braunschweig in Faculty Hall @ 4 pm.

Location: Faculty Hall


Topic : Borametallomimetics – Activation of Small Molecules by Low-valent Boron Species

Speaker : Prof. Holger Braunschweig
Institut für Anorganische Chemie,
Julius-Maximilians-Universität and
Institute for Sustainable Chemistry &
Catalysis with Boron, Julius-Maximilians-Universität Würzburg
Am Hubland, 97074 Würzburg, Germany

Date : 28th August 2019
Day : Wednesday
Time : 4.00 P.M.
Venue : Faculty Hall, IISc Bangalore
High Tea : 5.15 PM

Abstract :

The activation of small molecules is generally associated with transition metals (TM) and constitutes the basis of catalysis. It was believed that TM catalysts are required to facilitate processes such as the activation of H2 and other unreactive substrates. However, recent years have witnessed exciting developments in main group element chemistry, and the discovery of carbenes, FLPs and heavy main group species that are capable of TM-like activation reactions.1 Our ongoing studies on borylenes, diborenes, and diborynes have shown that these low-valent species exhibit a very rich chemistry, which is distinctly different from that of common compounds deriving from boron in oxidation state +3. Particularly interesting is the metal-like behavior of some borylenes and diborynes, which form CO complexes analogous to TMs, bind H2 and unsaturated organic substrates under mild conditions and even activate N2. 2

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[2a] H. Braunschweig, R. D. Dewhurst, F. Hupp, M. Nutz, K. Radacki, C. Tate, A. Vargas, Q. Ye, Nature, 2015, 327; [b] H. Braunschweig, K. Radacki, A. Schneider, Science, 2010, 328, 345; [c] H. Braunschweig, R. D. Dewhurst, K. Hammond, J. Mies, A. Vargas, K. Radacki, Science, 2012, 336, 1420; [d] M.-A. Légaré, G. Bélanger-Chabot, R. D. Dewhurst, E. Welz, I. Krummenacher, B. Engels, H. Braunschweig, Science, 2018, 359, 896; [e] M.-A. Légaré, M. Rang, G. Bélanger-Chabot, J. Schweizer, I. Krummenacher, R. Bertermann, M. Arrowsmith, M. C. Holthausen, H. Braunschweig, Science, 2019, 1329.