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Pentamethylcyclopentadienyl cation
Pentamethylcyclopentenyl cation

[cyclo-(CMe)5]+
[cyclo-(CMe)3(CHMe)2]+

Wikipedia: Pentamethylcyclopentadiene

Original (incorrect) crystal structure determination

J. B. Lambert, Lijun Lin, V. Rassolov, "The Stable Pentamethylcyclopentadienyl Cation", Angew. Chem. Int. Ed. (2002) 41, 1429–1431





Subsequent redeterminations and corrections

M. Otto, D. Scheschkewitz, T. Kato, M. M. Midland, J. B. Lambert, G. Bertrand, "The Stable Pentamethylcyclopentadienyl Cation Remains Unknown", Angew. Chem. Int. Ed. (2002) 114, 2379–2380

J. N. Jones, A. H. Cowley, C. L. B. Macdonald, "The crystal structure of the pentamethylcyclopentadienyl cation is that of the pentamethylcyclopentenyl cation", Chem. Commun. (2002) 1520–1521



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