Abstract
The rates of addition of methyl radicals, produced by the photolysis of acetone between 140 °C. and 240 °C, to unsaturated hydrocarbons were determined by two independent methods. From the kinetics of the addition and the methyl radical combination reactions, addition of methyl radicals to ethylene, propylene, acetylene, and butadiene was found to proceed with activation energies of 7.0, 6.0, 5.5, and ∼2.5 kcal. respectively and steric factors of the order of 10−4.
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