The reactions of methyl radicals formed by the photolysis of acetone and deutero‐acetone with nine paraffins have been studied from 25°C to 340°C. If the combination of methyl radicals requires no activation energy, then the activation energies found for the abstraction of hydrogen atoms are as follows: ethane, 10.4;n‐butane, 8.3; 2‐methyl propane, 7.6;n‐pentane, 8.1; 2,2‐dimethyl propane, 10.0;n‐hexane, 8.1; 2,3‐dimethyl butane, 6.9 and 7.8; 2,3,4‐trimethyl pentane, 7.9; 2,2,3,3‐tetra‐methyl butane, 9.5 (all values in kcal). The collision theory steric factors of these reactions are all less than 10−3.
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