215717-35-4Relevant articles and documents
η6-Arene-cobalt(I) complexes
Grossheimann,Holle,Jolly
, p. 205 - 211 (2007/10/03)
(η6-Arene)Co(I) complexes stabilized by bisphosphines, e.g. [(η6-MeC6H5)Co(Pr2 iPC2H4PPr2i)] +BF4-, have been prepared by reacting (η3-cyclooctenyl)Co(bisphosphine) species with HBF4 in the presence of an arene. The (η6-C6H6)Co(I) compounds can also be prepared by hydrogen abstraction from the corresponding (η5-cyclohexadienyl)Co(I) complex or by hydrogenation of (η3-cyclooctenyl)Co(II) species in the presence of benzene. Facile arene-exchange occurs upon treatment of these compounds with a second arene. In contrast, (η3-cyclohexenyl)Co(I) and (η5-cycloheptadienyl)Co(I) complexes are oxidized by HBF4 in the presence of an alkene to give (η3-cyclohexenyl)Co(II) and (η5-cycloheptadienyl)Co(II) species: the former have been characterized as their diamagnetic NO adducts and the latter by a crystal structure determination.