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 720−795 K and was shown to be first order in anisole concentration and homogeneous. The rate constant, expressed in the Arrhenius form, was[Formula: see text]The dissociation energy, D298(C6H5O—CH3), therefore equals 57 ± 2 kcal/mol, giving ΔHf(C6H5O) = 5 kcal/mol. The stabilization energy of the phenoxy radical is discussed.