Skeletal rearrangements have been shown to occur when 4-methylhex-4-enoic, 5-methylhex-4-enoic, 3-cyclohexylprop-2-enoic, and 4-cyclopentylbut-2-enoic acids undergo lactonisation or intramolecular acylation in the presence of hot 50% sulphuric acid or hot polyphosphoric acid.
M. F. Ansell, J. E. Emmett and B. E. Grimwood, J. Chem. Soc. C, 1969, 141 DOI: 10.1039/J39690000141
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