Ethoxymethylation of 7-hydroxy- (1) and 7-methoxy (6a) -chroman-4-ones with ethoxymethl chloride in the presence of anhydrous potassium carbonate and acetone results in formation of 3,3-bis-hydroxymethyl derivatives (3 and7) in very good yields, and not the expected 3-hydroxymethyl derivatives. But 5,7-dimethoxychroman-4-one (6b) does not react with ethoxymethyl chloride under the same conditions.
Volume 134, 2022
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