Thermal Rate Constant for Addition of Chlorine Atoms to Ethylene

Article abstract of DOI:10.1021/j100243a001

The relative reaction rate constant for removal of Cl atoms by addition to C2H4 in the gas phase at 4000-torr pressure has been measured at 298 K by a competitive radiochemical technique to be 2.9 +/- 0.1 times faster than the abstraction of H from C2H6 by Cl.This removal rate corresponds to an apparent reaction rate constant of (16.6 +/- 1.8)*10^-11 cm³ molecule^-1 s^-1, based on the measured value for reaction with C2H6.Correction for back-reaction of C2H4Cl* at 4000 torr leads to an estimated absolute reaction rate constant of (19 +/- 2)*10^-11 cm³ molecule^-1 s^-1 for k₁, Cl+C2H4 -> C2H4Cl* (1).The relative rates of abstraction by Cl of H from HI and PH3 are 2.21 +/- 0.10 and 4.13 +/- 0.13 times faster than abstraction from C2H6.