Chemical shifts and visible absorption maxima indicate that 2-phenylcyclopenta[b]-[l]-benzopyran is protonated solely on C-1 (five-membered ring) an analogous cation is probably formed from 2,4,6-triphenylcyclopenta[b]pyran. The site of protonation in cyclopenta[b]pyran and its derivatives is discussed in terms of molecular orbital theory.
G. V. Boyd and A. W. Ellis, J. Chem. Soc. B, 1966, 349 DOI: 10.1039/J29660000349
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