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The combustion intermediates which give rise to the 2600 A. absorption band observed during the oxidation of most hydrocarbons and referred to by Ubbelohde (7) as compound X were identified as /3-dicarbonyl compounds. The concentrations of these compounds decrease during cool flames whereas the concentrations of all the other intermediates observed increase during cool flames. Representative /S-dicarbonjfl compounds established were butanal-3-one from n-butane and 2,4-pentanedione from n-pentane. It was shown that a considerable fraction of the oxidized hydrocarbon goes through a /3-dicarbonyl structure at some time during its oxidation.

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