Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases p. 322 - 331 (1980)
Update date:2022-08-10
Topics:
Conlin, Robert T.
Frey, Henry M.
The thermal decomposition of 1,1,2,2-tetrafluorocyclobutane has been studied in the gase phase in the temperature range 485-593 deg C and at pressure around 5-9 Torr.There are two homogeneous first order decomposition pathways, one yielding 1,1-difluoroethylene (k1) and the other ethylene and tetrafluoroethylene (k2).Arrhenius equations have been obtained for these processes viz.: log k1/s-1 = 15.34 +/- 0.05-(292.0 +/- 0.8 kJ mol-1)/RTln 10; log k2/s-1 = 15.27 +/- 0.06-(308.1 +/- 0.9 kJ mol-1)/RTln 10.The decomposition is almost certainly unimolecular and at the pressures studied the rate constants are close to their infinite pressure values.Rate constants were also determined from 22 to 0.01 Torr at 542.2 deg C and the values obtained compared with those calculated using RRKM theory on the basis of various models.The energetics of the decomposition pathways are compared with cyclobutane and the fluorinated cyclobutanes.
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