Hexafluoro acetone CF 3 COCF 3 has been shown to react rapidly with the CH 2 OO, CH 3 CHOO, and (CH 3 ) 2 COO intermediates that are formed in the ozonolysis of C 2 H 4 , trans-2-C 4 H 8 , and 2,3-dimethyl-2-butene, respectively, and to form products tentatively assigned to the corresponding seconda
Trimethylsilyl group migration in the Criegee intermediate of gas-phase ozonolysis of trimethylsilylethenes
✍ Scribed by Radek Fajgar; Josef Pola
- Publisher
- Elsevier Science
- Year
- 2000
- Tongue
- French
- Weight
- 96 KB
- Volume
- 41
- Category
- Article
- ISSN
- 0040-4039
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✦ Synopsis
GC, GC/MS and GC/FTIR analyses of the final products of ozonolysis of trimethylsilylethene and trans-1,3bis(trimethylsilyl)ethene reveal that the ester channel of decomposition of the Criegee intermediate takes place exclusively via migration of Me 3 Si group.
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Ozonolysis of cis-and trans-2-butene isomers were carried out in a 570 l spherical glass vessel in 730 torr synthetic air at 295 Ϯ 3 K. The initial concentrations were 5 to 10 ppmv for the isomers and 2 to 5 ppmv for ozone. Quantitative yields were determined by FTIR spectroscopy for CH 3 CHO, HCHO,
## Abstract The gas‐phase kinetics and energetics of the Criegee intermediate, deduced from studies of O~3~‐alkene systems, suggest that a hydroxy‐substituted Criegee intermediate probably participates in the photooxidation of formaldehyde. In contradistinction, the existing evidence suggests that
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Ozonolysis of C,H, was carried out at 295 K in 730 torr synthetic air in the concentration ranges of 10310 = I 9-8.2 ppm and [C2H41(, = 4 0-15.0 ppm, in the absence and presence of the added HCOOH [Ipprn), CH,COOH (1-10 pprn), and CH,OH (36-100 ppm]. In the absence of the added compounds, a nearly c