Methylalion of the penlahydroxy flavone, quercetin, was observed to proceed in distinct stages. From the reaction mixture (methyl sulfale/potassium carbonate/acetone), the isolation of three major intermediates, a mono‐, a di‐ and a trimethyl ether and their identification as the naturally occurring ethers: tamarixelin, ombuin and ayanin is described.
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Rao et al. (1976) studied this question.