ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 23, Number 3
JKCSEZ 23(3)
June 20, 1979 

The thermal decomposition of a dilute mixture of 1,1,2,2,-C2H2F4 in argon has been investigated in a single-pulse shock tube between 1146 and 1232˚K at total reflected shock pressures of about 3000 torr. Under these conditions the reaction proceeds exclusively by the molecular elimination of hydrogen fluoride. It has been found that the asymmetric isomer with the fully fluorinated α-carbon requires the higher activation energy which may be attributed to the difference in atomic charge densities between isomers. The rate constant ratio is given by log(k1/k2) = -0.069 ± 0.021 ＋(1388±113) / 2.303RT in good agreement with previous independent studies.