1,2-Dihydrocyclobuta[e]tropolone, formed by ring-enlargement of benzocyclobutene-4,5-quinone with diazomethane, exists in tautomeric equilibrium almost exclusively as one tautomer; the methyl ethers formed on methylation correspond to a 1 : 1 mixture of the two tropolone tautomers.
M. Sato, S. Ebine and J. Tsunetsugu, J. Chem. Soc., Chem. Commun., 1978, 215a DOI: 10.1039/C3978000215A
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