Constitution of oroxylin-A and synthesis of its diethyl-ether

Ramachandra Row, L. ; Nageswara Sastry, V. D. ; Seshadri, T. R. ; Thiruvengadam, T. R. (1948) Constitution of oroxylin-A and synthesis of its diethyl-ether Proceedings of the Indian Academy of Sciences, Section A, 28 (4). pp. 189-197. ISSN 0370-0089

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The experiments described in this paper show that a pure sample of oroxylin-A melts at 219–20° (acetate, 139–40°), that the substance melting at 231–32° is a mixture of it with chrysin and that this mixture could be separated by fractionation of the acetates. The constitution of oroxylin-A as the 6-methyl ether of baicalein is confirmed by ethylating it to the diethyl ether and showing that the product is identical with a synthetic sample of 6-methoxy-5 : 7-diethoxy flavone. The details of the synthesis are given.

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