Abstract
The thermal decomposition of pyruvic acid diluted in Ar has been studied behind reflected shock waves over the temperature range 850-1000 K, with a total density range of (0.3-1.3)×10 -5 mol/cm 3 . The decomposition process was monitored by time-resolved IR emission from carbon dioxide product. The vacuum-UV absorption at 193 nm suggested the production of hydroxyethylidene from the initial decomposition. This carbene isomerizes to acetaldehyde at temperatures higher than those used under the present conditions. From the experimental results, we propose that the initial reaction occurs through a five-center transition state (TS) as CH 3 COCOOH →CH 3 COH+CO 2 with a rate constant k=10 12.46 exp(-40.0 kcal mol -1 /RP) s -1
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