Protonated cyclohepta-3,5-dienone has been shown to isomerise cleanly to protonated cyclohepta-2,4-dienone in FSO3H at +10°; quenching of the acid solution affords a convenient preparation of cyclohepta-2,4-dienone.
K. E. Hine and R. F. Childs, J. Chem. Soc., Chem. Commun., 1972, 144b DOI: 10.1039/C3972000144B
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