Summary
Flavylium salts containing γ- and α-pyrone rings have been prepared by condensing 7-hydroxy-3-methoxy-flavone-8-aldehyde and umbelliferone-8-aldehyde with hydroxy-aceto-phenones or their acetyl derivatives. They are found to have very feeble tinctorial properties and their fluorescence in concentrated sulphuric acid is not marked. The salts readily lose halogen and undergo conversion into colour bases.
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Row, L.R., Seshadri, T.R. Flavylium salts containing pyrone rings. Proc. Indian Acad. Sci. (Math. Sci.) 15, 118–122 (1942). https://doi.org/10.1007/BF03051308
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DOI: https://doi.org/10.1007/BF03051308