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Transcript
ORDANOCHROMIUM CHEMISTRY SUPPORTED BY
α-DIIMINE LIGANDS
Klaus H. Theopold, Jingmei Shen, Kevin A. Kreisel and Glenn P. A. Yap
Department of Chemistry and Biochemistry, University of Delaware
Newark, DE 19716, USA
α-Diimine ligands can accept up to two electrons; thus they can be used to stabilize
organometallic compounds in unusually low formal oxidation states of the central
metal. This redox ambiguity may be useful for facilitating catalytic reactions
involving different oxidation states. We are exploring the organometallic chemistry
of chromium with such ligands, and one of our initial, unexpected discoveries was a
‘quintuply’ bonded dinuclear species with a very short Cr-Cr distance (1.803 Å), see
below.1
This molecule is a low-valent, coordinatively unsaturated chromium synthon
accommodating variable oxidation states of the metal. It isomerizes and reacts with
various small molecules (e. g. alkenes, alkynes and arenes) to produce novel
organometallic molecules. It also catalyzes the selective trimerization of ethylene.
The synthesis, structure, and reactivity of a variety of compounds encountered in this
investigation will be described.
Reference
Kreisel, K. A.; Yap, G. P. A.; Dmitrenko, O.; Landis, C. R.; Theopold, K. H. J. Am.
Chem. Soc. 2007, 129, 14162-14163.
1