SCHEDULED MAINTENANCE
Thermal isomerisations of 3-methylbut-2-enyl ethers of tropolone and 3,5,7-trimethyltropolone proceed in refluxing n-nonane with migration of the ether residue to both 3- and 5-positions. Where enolisation of the resulting cyclo-heptadienediones cannot occur the 5,5-disubstituted cyclohepta-3,6-diene-1,2-dione predominates in the resulting equilibrium.
R. M. Harrison and J. D. Hobson, J. Chem. Soc., Perkin Trans. 1, 1973, 1958 DOI: 10.1039/P19730001958
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