Reductive acetylation of flavonols gives acetates of undetermined structure having one acetyl group less than would be expected. Hot mineral acid converts the acetates into the corresponding anthocyanidins smoothly and in good yield ; hydrolysis with caustic alkalis at room temperature, followed by acidification in the cold, leads to a small quantity of anthocyanidin. This appears to be a useful general method for the production of anthocyanidins from flavonols.
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