1. Multiple complexation of CO and related ligands to a main-group element.
- Author
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Braunschweig, Holger, Dewhurst, Rian D., Hupp, Florian, Nutz, Marco, Radacki, Krzysztof, Tate, Christopher W., Vargas, Alfredo, and Ye, Qing
- Subjects
CARBON monoxide ,CHEMICAL adducts ,TRANSITION metals ,ENZYMES ,CARBON-carbon bonds ,LIGANDS (Biochemistry) - Abstract
The ability of an atom or molecular fragment to bind multiple carbon monoxide (CO) molecules to form multicarbonyl adducts is a fundamental trait of transition metals. Transition-metal carbonyl complexes are vital to industry, appear naturally in the active sites of a number of enzymes (such as hydrogenases), are promising therapeutic agents, and have even been observed in interstellar dust clouds. Despite the wealth of established transition-metal multicarbonyl complexes, no elements outside groups 4 to 12 of the periodic table have yet been shown to react directly with two or more CO units to form stable multicarbonyl adducts. Here we present the synthesis of a borylene dicarbonyl complex, the first multicarbonyl complex of a main-group element prepared using CO. The compound is additionally stable towards ambient air and moisture. The synthetic strategy used-liberation of a borylene ligand from a transition metal using donor ligands-is broadly applicable, leading to a number of unprecedented monovalent boron species with different Lewis basic groups. The similarity of these compounds to conventional transition-metal carbonyl complexes is demonstrated by photolytic liberation of CO and subsequent intramolecular carbon-carbon bond activation. [ABSTRACT FROM AUTHOR]
- Published
- 2015
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