The Bitter Substance, Produced in Black-rotten Sweet Potato. III. On the Constitution of Ipomoeamarone. Part 2

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By oxidation of ipomoeamarone and its semicarbazone with potassium permanganate, ceratonic acid (ipomeanic acid) (II), C12H20O4, and ipomic lactone (III), C11H18O3, were obtained. The ketonic group of ipomoeamarone was proved to be an isoamyl ketone by the oxidation of the reaction product of Grignard’s reagent. These experiments led us to conclude that ipomoeamarone is represented by the provisional constitution (I).

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