University of Calgary
UofC Navigation

Stay Connected

Fac. of Science IT Support

Contact

Department of Chemistry

Science A 229
University of Calgary
2500 University Dr NW
Calgary, AB T2N 1N4 Canada
T. 403.220.5341
F. 403.289.9488
info@chem.ucalgary.ca

Leibniz Lecture: Prof. Holger Braunschweig

Date & Time:
May 4, 2017 | 12:00 pm - 2:00 pm
Location:
Senate Room, Hotel Alma

Registration for this event is required, lunch will be provided.

Title: Turning Boron Chemistry on its Head: The unusual chemistry of boron in low oxidation states

Abstract:
     Due to its inherent electron deficiency, boron prefers non-classical bonding regimes when combined to molecules with itself - in other words, boron forms polyhedral boranes, made up of multicenter bonds, rather than chains or rings with electron-precise boron-boron bonds. In the case of the latter, only very few well-defined examples have been published over the past decades, which all suffer from low-yielding, non-selective syntheses that solely rely on reductive coupling of amino(halo)boranes. Consequently, the area of classical boron-boron multiple bonds is relatively undeveloped. Over the past four years we have put significant effort into the development of new synthetic strategies to overcome this seemingly element-specific deficiency.[1] Here, some new results on the formation of B-B-double and –triple bonds will be presented together with some unusual results from reactivity studies of the latter.[2]

References:
[1] H. Braunschweig, F. Güthlein, Angew. Chem. Int. Ed. 2011, 50, 12613; Eur. Patent EP2554547 (A1), 2013;  H. Braunschweig, R. D. Dewhurst, K. Hammond, J. Mies, K. Radacki, A. Vargas, Science 2012, 336, 1420; H. Braunschweig, Q. Ye, A. Vargas, R. D. Dewhurst, K. Radacki, A. Damme, Nat. Chem. 2012, 4, 563; H. Braunschweig, T. Dellermann, R. D. Dewhurst, W. C. Ewing, K. Hammond, J. O. C. Jimenez-Halla, T. Kramer, I. Krummenacher, J. Mies, A. K. Phukan, A. Vargas, Nat. Chem. 2013, 5, 1025; H. Braunschweig, R. D. Dewhurst, Angew. Chem. Int. Ed. 2013, 52, 3574.

[2] M. Arrowsmith, D. Auerhammer, R. Bertermann, H. Braunschweig, G. Bringmann, M. A. Celik, R. D. Dewhurst, M. Finze, M. Grüne, M. Hailmann, T. Hertle, I. Krummenacher, Angew. Chem. Int. Ed. 2016, 55, 14464; J. Böhnke, H. Braunschweig, T. Dellermann, W. C. Ewing, K. Hammond, T. Kramer, J. O. C. Jimenez-Halla, J. Mies, Angew. Chem. Int. Ed. 2015, 54, 13801; J. Böhnke, H. Braunschweig, T. Dellermann, W. C. Ewing, T. Kramer, I. Krummenacher, A. Vargas, Angew. Chem. Int. Ed. 2015, 54, 4469; P. Bissinger, A. Steffen, A. Vargas, R. D. Dewhurst, A. Damme, H. Braunschweig, Angew. Chem. Int. Ed. 2015, 54, 4362; P. Bissinger, H. Braunschweig, A. Damme, C. Hörl, I. Krummenacher, T. Kupfer, Angew. Chem. Int. Ed. 2015, 54, 359; J. Böhnke, H. Braunschweig, W. C. Ewing, C. Hörl, T. Kramer, I. Kummenacher, J. Mies, A. Vargas, Angew. Chem. Int. Ed. 2014, 53, 9082; H. Braunschweig, P. Bissinger, A. Damme, T. Kupfer, I. Krummenacher, A. Vargas, Angew. Chem. Int. Ed. 2014, 53, 5689.

For more information please visit http://www.ucalgary.ca/uci/leibniz 

Seminar Notice