Diacetyl Infrared Spectrum

The infrared spectrum of the compound X from diacetyl is shown in Figure 21. It shows the following features ... 

The sodium salt of diethyl acetonedicarboxylate reacts with aryl isocyanates to give 1-aryl-4,6-dihydroxy-2-pyridones (XU-104)and with phenyl isothiocyanate to give 3-carbethoxy4-hydroxy-2-mercapto-l-phenyl-6-pyridone, Th e compound formed on treatment of XI-104 (R = H) with acetic anhydride has been proposed to be 3,5-diacetyl-4,6-dihydroxy-l-phenyl-2-pyridone. Characterization was based on the infrared spectrum, ... 

Pure diacetyl, dibutyryl, and p Tuvic acid have all been reported to produce ozone on photolysis in oxygen. First attempts to verify this result with use of the long-path infrared technique were frustrated by appearance in the spectrum of a band of methanol which masked the absorption resulting from ozone. This difficulty was overcome by the use of the following technique ... 

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