Mercapto[15]annulenone (4) has been prepared from annulenone (2) as a tautomeric mixture with the keto-tautomer (5) in 65% yield; it was found that (4) proved to be diatropic and exists as a rapid equilibrium mixture of (4a) and (4b).
H. Ogawa, M. Yoshikawa, H. Tanaka, T. Imoto, I. Miyamoto, H. Kato, Y. Taniguchi, Y. Nogami and T. Koga, J. Chem. Soc., Chem. Commun., 1989, 505 DOI: 10.1039/C39890000505
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