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Pentamethylcyclopentadienyl cation
Pentamethylcyclopentenyl cation


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

Based on template by A. Herráez as modified by J. Gutow
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