Abstract
IN an earlier communication1, the classical free electron model proposed by Pople2 was modified and successfully applied to the description of the nuclear resonance spectra of hydrocarbons containing six-membered aromatic rings. It was then noted that results on a five-membered aromatic ring did not appear to be in good agreement with this theory. We now wish to report complete data on the aromatic systems C5H5 − and C7H7 + (cyclopentadienide ion and tropylium ion, respectively), and to compare them with theoretical expectations. The aromaticity of these two species is generally accepted3–5.
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References
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LETO, J., COTTON, F. & WAUGH, J. Chemical Shifts in C5H5 − and C7H7 + Ions: the Free Electron Model. Nature 180, 978–979 (1957). https://doi.org/10.1038/180978b0
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DOI: https://doi.org/10.1038/180978b0
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