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Abstract:
An efficient synthesis of hexakis(trifluoromethyl)cyclopentadiene 4,
which shows a remarkably low reduction potential, is described. Various
donors promote one-electron transfer to 4, leading to corresponding
salts of pentakis(trifluoromethyl)cyclopentadienide 5. A novel approach
to the synthesis of metal derivatives involves heating, or photolysis,
of 4 directly with metals (including Cu, Ni, Fe and Co), leading to the
corresponding ionic salts. X-Ray structural analysis was difficult
because of rotation of trifluoromethyl groups in these salts, but
structural data on 20, 24 and 30 has been obtained that reveals
interesting conformations and stacking of the ions.
