. Can. J. Chem. 53,3330(1975). The rate of dissociation of anisole into phenoxy and methyl radicals has been measured using a toluene scavenging technique. The rate was measured by the production of methane over the range of temperature 72@-795 K and was shown to be first order in anisole concentration and homogeneous. The rate constant, expressed in the Arrhenius form, was log k (s-') = 13.7 + 0.3 -58000 + 2000
2.3RTThe dissociation energy, D298(C6H50-CH3), therefore equals 57 + 2 kcal/mol, giving AHf(C6H,0) = 5 kcal/mol. The stabilization energy of the phenoxy radical is discussed.