Pressure dependence of chemical branching in the oxygen-atom reaction with allyl chloride

The pressure dependence of the rate constant of the O-atom reaction with allyl chloride and its branching fraction to produce HCO + CH₂ClCH₂ were measured over a seven-fold pressure range (0.5-3.5 Torr) at 299 K. Both are independent of pressure (<20% change). The results suggest that the rearrangements in the energy-rich adduct which are required to yield the products of the route studied are not collision induced.