Response : On "Animal Hypnosis"

Abstract
A structural formula is proposed for actidione. On alkaline hydrolysis the molecule is split into: NH3, 2,4-dimethylcyclohexaone, and, presumably, 3,3-propionaldehyde-diacetic acid. Oxidation of actidione yields a diketone, dehy-droactodione, which on alkaline hydrolysis is degraded to NH3, 2,4-dimethylcyclohexanone, and methanetriacetic acid. Elec-trometric titration of the antibiotic shows a weakly acidic group with a pK = 11.2. Catalytic reduction gives dihydroacti-dione which reacts with diazomethane to give N-methyldihydro-actidione.

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