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DOI:
10.1055/sos-SD-001-00322
Malacria, M.; Aubert, C.; Renaud, J.-L., Science of Synthesis, (2001) 1, 517.
Cobalt complexes are able to catalyze the migration of C—C bonds that in this section are called rearrangements. These migrations essentially concern ring expansion and cyclizations such as Diels–Alder and homo-Diels–Alder 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-Diels–Alder reactions the cobalt complex is used as a precatalyst and mediates the reactions.
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