The kinetics of the uninhibited reaction of 2-chloropropene in the gas-phase has been studied between 662 and 747 K at pressures ranging from 11 to 76 Torr with the object of determining the overall mechanism using static system. The reaction was found to be accurately of the first order at the high pressures and the observed rate coefficient is expressed by the following Arrhenius equation: ktotal uninhibited = 107.98  0.6 (s –1) exp–167  7.8 (kJ/mole)/RT The activation energy was calculated at 167±7.98kJ/mol and identified with the dissociation of C-Cl bond. The reaction is presumed to be unimolecular at lower temperature with formation of propyne and elimination of hydrogen chloride. However, at high temperature C-Cl bond fission takes place and this changes the mechanism of the reaction. Two mechanisms dehydrohalogenation molecular elimination and C-Cl bond fission are discussed.

Jan Nisar, Rameez Razaq and Iftikhar Ahmad Awan