When treated with thallium(III) acetate in acetic acid or acetonitrile, flavanones undergo facile dehydrogenation to afford flavones whereas, upon treatment with thallium(III) toluene-p-sulfonate or thallium(III) nitrate in propionitrile or acetonitrile, respectively, they undergo oxidative 2,3-aryl migration to give isoflavones in high yield.
M. S. Khanna, O. V. Singh, C. P. Garg and R. P. Kapoor, J. Chem. Soc., Perkin Trans. 1, 1992, 2565 DOI: 10.1039/P19920002565
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