Reaction of C2F5 radicals with HCl. Determination of the bond dissociation energy D(C2F5—H)

Abstract

The reaction C₂F₅+ HCl → C₂F₅H + Cl k₂(2) was investigated over the range 23–152°C using perfluoropropionic anhydride as a photolytic source of C₂F₅ radicals. Arrhenius parameters are given by log(k₂/cm³ mol^–1 s^–1)=(10.80 ± 0.14)–(4240 ± 230)/θ where θ= 2.303 RT/cal mol^–1. The reactivity of C₂F₅ radicals with polar and non-polar substrates is discussed. The above value of E₂ leads to a value of the bond dissociation energy D(C₂F₅—H)= 103.1 ± 1.5 kcal mol^–1 in good agreement with previous work.