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Anaïs Geny, Nicolas Agenet, Laura Iannazzo, Max Malacria, Corinne Aubert and Vincent Gandon Air-Stable {(C5H5)Co} Catalysts for [2+2+2] Cycloadditions Angewandte Chemie International Edition 48

Version of Record online: 28 JAN 2009 | DOI: 10.1002/anie.200806001

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Cobalt cyclopentadienyl complexes incorporating a fumarate and a CO ligand (see picture) efficiently catalyze inter- and intramolecular [2+2+2] cycloadditions of alkynes, nitriles, and/or alkenes to give benzenes, pyridines, or 1,3-cyclohexadienes. Unlike catalysts such as [CpCo(CO)2] or [CpCo(C2H4)2] (Cp=C5H5), they are air-stable, easy to handle, compatible with microwave conditions, and do not necessarily require irradiation to be active.

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