The 4-hydroxy coumarins have been reacted witho-benzoquinone, in acetone in the absence of the oxidant potassium ferricyanide. The products were found to be 3-aryl-4-hydroxy coumarins which were cyclised to the corresponding 11,12-dihydroxy coumestans. The structure of 11,12-dihydroxy coumestan has been confirmed by an unambiguous synthesis. The structures of other compounds were confirmed on the basis of their analytical, chemical and spectral data.
Volume 134, 2022
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