ChemInform Abstract: GAS‐PHASE OZONOLYSIS OF CIS‐ AND TRANS‐DICHLOROETHYLENE

Abstract

Dichloroethylene (DCE), either czs or trans, was reacted with 0 3 at 23°C in both NZ and 0 2 buffered mixtures. Both reactant consumption and product formation were monitored by infrared spectroscopy and, in some cases, 0 3 consumption was monitored by ultraviolet absorption. For thoroughly dried mixtures, the initial products were only HCClO and Oz, but geometrical isomerization also occurred. The stoichiometry of the overall reaction always wasThe HCClO was unstable and disappeared slowly in a first-order reaction which was, at least in part, heterogeneous. The products were CO and HC1 so that the stoichiometric reaction was (2) In the NZ buffered reaction, inhibition occurred as the reaction progressed and 0 2 was produced. From the reactant and product decay curves, the following rate behavior was established:The rate was always faster in NZ than in 0 2 .The rate law was complex. rate = kz [DCE] [OX] rate = k3 [DCElZ[03] high [DCE] low [DCE]