Science of Synthesis

Malacria, M.; Aubert, C.; Renaud, J.-L., Science of Synthesis, (2001) 1, 443.

Bis(alkene)(η5-pentaalkylcyclopentadienyl)cobalt(I) complexes are conveniently prepared by a sodium amalgam reduction of the dimeric compounds [Co2(C5R15)2X2] in the presence of an excess of the requisite alkene (‌Scheme 4‌). The starting materials for the syntheses, the (η5-pentaalkylcyclopentadienyl)cobalt(II) halide dimers [Co2(C5R15)2X2] (X = Cl, I), are readily obtained by well-documented procedures either from octacarbonyldicobalt(0)[‌23‌] or from cobalt(II) halides.[‌24‌]

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References