Allan–Robinson syntheses of 3,5-dihydroxy-4′,6,7-trimethoxyflavone (mikanin), 5-hydroxy-3,3′,4′,5′,7-pentamethoxyflavone (combretol), and 3,5,7-trihydroxy-2′-methoxyflavone (ptaeroxylol) are described. A method for the purification of flavones by sublimation in vacuo is discussed.
K. Y. Sim, J. Chem. Soc. C, 1967, 976 DOI: 10.1039/J39670000976
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