The vibrationally excited molecules CF,CH,\* and CF,CD,\* have been synthesized by radical combination (produced by ketone photolysis), and HF and DF elimination from them studied as a function of temperature and pressure. Using RRK theory many calculations have recently been made of critical energi
The unimolecular decomposition of vibrationally excited 1-deuterio-1,1,2-trifluoroethane
✍ Scribed by D. W. Follmer; G. O. Pritchard
- Publisher
- John Wiley and Sons
- Year
- 1974
- Tongue
- English
- Weight
- 693 KB
- Volume
- 6
- Category
- Article
- ISSN
- 0538-8066
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✦ Synopsis
A srudy has been made of the unimolecular decomposition of the vibrationally excited molecule CFZDCFHz*, formed from the combination of CFzD and CFH? radicals. The a,B-elirnination channels lead to the products cisand trans-CFDCFH and CFzCHz and H(D)F. The a,a-elimination channel produces cisand trans-CFHCFH and DF. The pressure dependencies of the various isomer ratios have been examined. For the a,a elimination the energy partitioning pattern is such that subsequent isomerization of the olefin product can occur. This, and previous work on CDClZCHZCl*, clearly show that the enrrgy partitioning in a,a and a,@ eliminations is very different. It is tentatively concluded that HF (from the CFH? group) and HD eliminations also take place.
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The title reaction was studied in a standard flow system with F atoms produced by R F discharge in FZ-He mixture. Analysis was by gas chromatography using electron capture detection. There were two major products, identified as CFZBrCFzH and CFZBrCFzBr, plus presumably HF which was not detectable. T