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Stopped-flow studies of the mechanisms of ozone–alkene reactions in the gas phase propene and isobutene

✍ Scribed by John T. Herron; Robert E. Huie

Publisher
John Wiley and Sons
Year
1978
Tongue
English
Weight
894 KB
Volume
10
Category
Article
ISSN
0538-8066

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✦ Synopsis

The reactions of ozone with propene and isobutene have been studied in the gas phase at 298'K and 530 Pa (4 torr) using a stopped-flow reactor coupled to a photoionization mass spectrometer. Reactant and product concentrations were followed as a function of reaction time. The major reaction products monitored were CH20, CH&HO, COz, and HzO from the propene reaction, and CH20, (CH&CO, COz, and H20 from the isobutene reaction. The observations were interpreted on the basis of the Criegee mechanism for ozonolysis in solution:

for which we find k~ N k g . In the gas phase the carbene peroxy radical is postulated to isomerize and decompose into molecular and free-radical products.

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