Premium
Stopped‐flow studies of the mechanisms of ozone–alkene reactions in the gas phase propene and isobutene
Author(s) -
Herron John T.,
Huie Robert E.
Publication year - 1978
Publication title -
international journal of chemical kinetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.341
H-Index - 68
eISSN - 1097-4601
pISSN - 0538-8066
DOI - 10.1002/kin.550101003
Subject(s) - propene , chemistry , ozonolysis , alkene , ozone , photochemistry , gas phase , reaction mechanism , carbene , torr , radical , analytical chemistry (journal) , organic chemistry , catalysis , thermodynamics , physics
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 CH 2 O, CH 3 CHO, CO 2 , and H 2 O from the propene reaction, and CH 2 O, (CH 3 ) 2 CO, CO 2 , and H 2 O from the isobutene reaction. The observations were interpreted on the basis of the Criegee mechanism for ozonolysis in solution:for which we find k A ≈ k B .In the gas phase the carbene peroxy radical is postulated to isomerize and decompose into molecular and free‐radical products.