The gas-phase thermal isomerization of some tri- and tetra-fluoro-dewar benzenes
Abstract
The kinetics of the gas-phase thermal isomerization of 1,2,3,5- and 1,2,4,5-tetrafluorobicyclo[2.2.0]hexa-2,5-diene into the corresponding tetrafluorobenzenes have been studied over a temperature range of 320–390 K and a pressure range of 100–2 000 N m–2. The reactions are homogeneous, obey a first-order law, and are unimolecular. The temperature dependence of the rate constants is given by the Arrhenius equations (1) for 1,2,3,5-tetrafluorobicyclo[2.2.0]hexa-2,5-diene, and (2) for 1,2,4,5-tetrafluorobicyclo[2.2.0]hexa-2,5-diene. log (k/s–1)= 13.73 ± 0.30 –