Abstract
AbstractA recently described procedure for imidazole‐catalyzed deacetylation of acetoxyflavones has been modified by effecting hydrolysis in a mixture of deuterium oxide and deuterioethanol (C2H5OD), or in deuterium oxide and deuteriomethanol (CH3OD). Application of the new procedure to monoacetoxyflavones has resulted in the monodeuteroxyflavone. 5‐Deuteroxyflavone has been obtained also by hydrolysis of a rubidium salt in deuterium oxide. Imidazole‐catalyzed hydrolysis of four diacetoxyflavones in a mixture of deuteriomethanol and deuterium oxide is described. Infrared spectral data are presented for the deuteration products, with emphasis on OD stretching and vibrational modes. Comparison of spectra of appropriate monohydroxyflavones and monodeuteroxyflavones permits assignment of δ (OH) bands in four hydroxyflavone spectra.
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