The benzene oxide–oxepin system is converted into muconaldehyde by oxidation with peroxy-acids or with N-bromosuccinimide in aqueous dimethyl sulphoxide. Comparative studies on indane 3a,7a-oxide and 2,7-dimethyloxepin lead to the conclusion that the oxidative ring opening involves the oxepin tautomer.
S. G. Davies and G. H. Whitham, J. Chem. Soc., Perkin Trans. 1, 1977, 1346 DOI: 10.1039/P19770001346
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