SUMMARYVolatile monocarbonyls produced by mildly oxidized esters of oleic, linoleic, linolenic acids and fats have been characterized by paper chromatography of 2,4‐dinitrophenylhydrazone derivatives. The unsaturated fatty acid esters yielded a total of 7n‐alkanals, 8n‐alk‐2‐enals, and 4 alk‐2,4‐dienals; and similar results were obtained with the fats. Each unsaturated acid produced three major characteristic aldehydes. Comparisons of esters and glycerides showed the presence of keto or aldehyde ester scis
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