Summary
A general method for the preparation of 5-hydroxyflavone and its derivatives from the corresponding 5:7-dihydroxyflavones by the action of Raney nickel on the 7-tosyloxy derivatives is described. Thus chrysin has been converted into 5-hydroxyflavone, and galangin 3-methyl ether to 5-hydroxy-3-methoxyflavone.
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Ramanathan, V., Venkataraman, K. Synthetical experiments in the chromone group. Proc. Indian Acad. Sci. (Math. Sci.) 38, 40–44 (1953). https://doi.org/10.1007/BF03045234
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DOI: https://doi.org/10.1007/BF03045234