Claisen rearrangement of three 1-hydroxy-3-(3-methylbut-2-enyl)oxyxanthones at 200° for 3 h yields the corresponding deprenylated xanthones and linear and angular furoxanthones, in contrast to previous results.
S. M. Anand and A. C. Jain, J. Chem. Soc., Chem. Commun., 1972, 1026 DOI: 10.1039/C39720001026
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