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The second triannulenylene: tri-[8]annulenylene.

J Am Chem Soc; 126(29): 8884-5, 2004 Jul 28.
Artigo em Inglês | MEDLINE | ID: mdl-15264805
Room-temperature dehydrohalogenation of bromocyclooctatetraene (BrC8H7) with potassium tert-butoxide followed (after a couple of minutes) by alkali metal reduction was used to generate the anion radical of tri-[8]annulenylene [(C8H6*-)3] in HMPA. EPR analysis reveals that the odd electron is primarily located in one of the three eight-membered ring systems, which is rendered planar. Excellent agreement was obtained between spin densities predicted by B3LYP/6-31G* calculations and those observed. The neutral tri-[8]annulenylene system has a propensity toward polymerization, but it can be isolated for NMR and mass spectral analysis via the I2 oxidation of the anion radical. The NMR analysis reveals that two of the eight-membered rings are bent above the plane of the benzene ring and the other is bent below. Tri-[6]annulenylene (triphenylene) is the only other known member of the triannulenylenes.