Good agreement between experimental (from the 1H n.m.r. spectrum in a nematic solvent) and calculated direct coupling constants for tropone in solution rules out large anharmonic puckering modes and indicates slight bond alternation in the seven-membered ring.
C. A. Veracini and F. Pietra, J. Chem. Soc., Chem. Commun., 1972, 1262 DOI: 10.1039/C39720001262
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