Abstract
Using long-path FTIR absorption spectroscopy, the kinetics and products of the reaction of OH radicals with the enediol form of acetylformoin, 3,4-dihydroxy-3-hexene-2,5-dione, an important aromatic photooxidation product, have been investigated in a 1080-L reaction chamber. A rate coefficient of (2.7±0.7)×10 -10 cm 3 molecule -1 s -1 has been obtained for the reaction at 296±2 K in 1000 mbar of synthetic air. Pyruvic acid and CO have been identified as minor reaction products. The experimental evidence supports that the major product is probably a hydrated vicinal polyketone, 3,3-dihydroxyhexane-2,4,5-trione. The results also imply that polyketones will be important products in the photooxidation of alkylated benzenes and that they could account for 25-30% of the missing carbon in aromatic oxidation systems
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