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DOI: 10.1055/sos-SD-001-00322

Malacria, M.; Aubert, C.; Renaud, J.-L.Science of Synthesis, (20011517.

Cobalt complexes are able to catalyze the migration of CC bonds that in this section are called rearrangements. These migrations essentially concern ring expansion and cyclizations such as DielsAlder and homo-DielsAlder reactions. In these latter cases, the role of the cobalt complexes is different. In the [4+2] reactions the cobalt species are attached to the diene partner via a σ-bond to enhance its reactivity, whereas in the homo-DielsAlder reactions the cobalt complex is used as a precatalyst and mediates the reactions.