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investigated with the purpose of obtaining a method for selective isolation of fragments of the carbon chain of butyrate. The products of the oxidation, carbon dioxide, acetic acid, acetone, acetaldehyde, propionaldehyde, and an unidentified non-volatile compound have been determined quantitatively and their C13 contents measured. Identification of the acetaldehyde and propionaldehyde is tentative.From CH3CH2CH2C13OOH the only products that contained excess C13 were carbon dioxide and the non-volatile fraction. The other products, therefore, are formed from the a, ß and 7 carbons of the butyric acid. From CH3C13-H2CH2C13OOH each product was found to contain excess C13. The excess C13 in the acetone was determined by iodoform degradation to be exclusively in the carbonyl group. Using this type of degradation the C13 in the carboxyl and ß positions of the butyrate can be measured quantitatively. The average of the a and y