Multiple complexation of co and related ligands to a main-group element.

• Autores: H. Braunschweig, Rian D. Dewhurst, Florian Hupp, Marco Nutz, Krzysztof Radacki, Christopher W. Tate, Alfredo Vargas, Qing Ye
• Localización: Nature: International weekly journal of science, ISSN 0028-0836, Vol. 522, Nº Extra 7556, 2015, págs. 327-330
• Idioma: inglés
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• Resumen

  • 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 1, and have even been observed in interstellar dust clouds 2. Despite the wealth of established transition-metal multicarbonyl complexes 3, 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.