Hydroboration followed by chromic acid oxidation of 3-phenylcoumarin and 4-hydroxy-3-phenyl-coumarin yields isoflavanone; when 3-benzyl-4-hydroxy-coumarin was used homoisoflavanone was produced.
B. S. Kirkiacharian, J. Chem. Soc., Chem. Commun., 1975, 162 DOI: 10.1039/C39750000162
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