SCHEDULED MAINTENANCE
That the key step in the title reaction id the Diels–Alder addition of 3-acetylchromenone (1) to its acyl–acyl rearranged isomer (9′a) is supported by the formation of 2-salicyloylxanthone (5) from the reaction of (9) with any of the chromenones (1)—(4)
C. K. Ghosh, A. Bhattacharyya and C. Bandyopadhyay, J. Chem. Soc., Chem. Commun., 1984, 1319 DOI: 10.1039/C39840001319
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