Intramolecular cyclisation of p-hydroxyarylpropan-2-one oximes to 2,5-dienonespiroisoxazolines can be achieved by using bromine, N-bromosuccinimide, or tetrabromocyclohexa-2,5-dienone. With an analogous ortho-phenolic oxime only the last of these was effective, the structure of the 2,4-dienonespiroisoxazoline formed being confirmed by an independent synthesis.
A. R. Forrester, R. H. Thomson and S. Woo, J. Chem. Soc., Perkin Trans. 1, 1975, 2348 DOI: 10.1039/P19750002348
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