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The action of ethanolic potassium cyanide on certain 3-benzylidcnecoumaran-3-ones gives the corresponding flavones. KOSTANECKI'S first synthesis of flavones (11; R = aryl) (Emilewicz and Kostanecki, Ber., 1898, 31, 696), which involves the action of ethanolic alkali on 2'-acetoxychalkone a$-dibromides (I; R = aryl), was found by him to be of limited application. 2-Benzylidenecoumaran-3-ones (111; R = aryl) are obtained in two cases : (a) when R is P-alkoxyaryl

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