Free radical addition to olefins. Part 6. - Addition of sulphur chloride pentafluoride to fluoro-olefins

H. W. Sidebottom*, J. M. Tedder, J. C. Walton

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)

Abstract

The light-induced addition of SF5Cl to fluoro-olefins (E) has been studied in a large series of experiments in which light intensity, temperature and relative concentrations have been varied. The reaction mechanism is the same as that established for ethylene with the following principal chain carrying steps: SF5·+E⇌k-2 k2SF5E· SF5E·+SF 5Cl→k3SF5ECl+SF5·, and the combination of two SF5· radicals (k6) the main chain termination step. The addition to tetrafluoro-, trifluoro- and 1,1-difluoro-ethylene has been investigated and from studies on the latter two compounds the following rate expressions were obtained. (SF5ECl) log (A2/A61/2) (1.1/2 mol-1/2 s-1/2) E2-1/2E6 (kcal mol-1) log (A-2/A3) (1.-1 mol) E-2-E 3 (kcal mol-1) SF5CH2CF 2Cl 0.62±0.05 2.0±0.1 4.5±0.5 12.7±1.0 SF5CHFCF2Cl 1.40±0.08 3.4±0.2 3.5±0.3 8.4±1.0 * R the gas constant taken to be 1.9872 cal deg. -1 mol-1 and subsequent energies expressed in cal mol -1 (1 cal=4.1855 J).

Original languageEnglish
Pages (from-to)2038-2044
Number of pages7
JournalTransactions of the Faraday Society
Volume66
DOIs
Publication statusPublished - 1 Jan 1970

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