The Reactions of Methyl and Ethyl Radicals With Diethyl Ketone

The hydrogen-abstraction reactions of methyl and ethyl radicals from diethyl ketone have been studied in the temperature range 25 to 160 °C. Azomethane and azoethane were used as photochemical sources of methyl and ethyl radicals. The activation energies found were 7.0 and 7.6 kcal., respectively, for the reactions:[Formula: see text][Formula: see text]If the combination of both methyl and ethyl radicals is assumed to occur at every collision, the steric factors for the two reactions are E 1 = 7.4 × 10 −4 , E 2 = 7.1 × 10 −4 .