Synthesis of benzodipyrandiones

Merchant, J. R. ; Shirali, S. S. ; Kamat, M. S. ; Dike, D. Y. (1977) Synthesis of benzodipyrandiones Proceedings of the Indian Academy of Sciences, Section A, 85 (6). pp. 524-530. ISSN 0370-0089

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The reaction of hydroxycoumarins, flavones, isoflavones and chromones with α, β-unsaturated acids, in the presence of PPA has been found to give a number of compounds whose structures have been elucidated on the basis of spectral data and the formation of 2, 4-DNP derivatives.

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