Bergman Seminar in Inorganic Chemistry: High-Valent Chromium with Multiple Bonds to Oxygen, Nitrogen, and Carbon

Seminar | October 12 | 4-5 p.m. | 120 Latimer Hall

 Klaus Theopold, Department of Chemistry & Biochemistry, University of Delaware

 College of Chemistry

Our longstanding interest in the coordination chemistry of chromium has recently taken a turn to the highest formal oxidation states of that metal.
One thread of that story is the ‘peractivation’ - aka oxidative addition - of the small molecules O2 and N2. We are interested in the mechanisms of these reactions and the origins of their activation barriers. For example, does spin state play a role in determining their pathways?

Another story line involves the preparation and reactivity of Cr(VI) alkylidenes. These unusual congeners of the more common Mo and W analogs may offer new catalysts for the olefin metathesis with differential reactivity and selectivity.

Klaus Theopold was born in Berlin, Germany and grew up in Hamburg. Having received his ‘Vordiplom’ in Chemistry at his hometown university, he took a leap of faith to California in 1978, arriving at UC Berkeley just in time to join the incipient research group of Prof. Robert G. Bergman, then newly arrived from CalTech. While his thesis work on ‘Dinuclear Cobaltacycles’ was soon overshadowed by the excitement over C-H activation, Bob’s unique approach of applying the tools of physical organic chemistry to inorganic molecules proved formative. In 1982, having acquired a Ph.D. and a family, Klaus moved east, where he spent a year as a postdoc in the laboratory of Prof. Richard R. Schrock at MIT, playing with niobium and tungsten. In 1983 he began his independent academic career, and he is now a Professor of Chemistry at the University of Delaware, still fascinated with organometallic molecules., 510-643-0572