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Gas-phase kinetics of elimination reactions of pentane-2,4-dione derivatives

✍ Scribed by Nouria A. Al-Awadi; Mohamed H. El-Nagdi; Tommy Mathew

Publisher
John Wiley and Sons
Year
1995
Tongue
English
Weight
347 KB
Volume
27
Category
Article
ISSN
0538-8066

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✦ Synopsis

Gas-phase elimination reactions of pentane-2,4-dione, methyl acetoacetate, ethyl acetoacetate, 3phenylhydroazopentane-2,4-dione, and ethyl 3-0x0-2-phenyl-hydrazonobutyrate have been measured in the temperature ranges of 744-783, 662-695, 614-663, 604-664, and 503 -555 K, respectively, using a flow-thermolysis technique. These compounds undergo unimolecular first-order elimination reactions, for which log A = 11.9, 11.2, 11.7, 11.5, and 11.7 s-l and E, = 198.3, 167.1, 141.7, 165.6, and 141.7 kJ mol-l, respectively. The kinetic data and product analysis shows that the reactions are highly affected by the electronic nature of the substituents at the carbonyl and methylene carbon atoms of the substrates investigated.

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