Communication to the editor pentyl radical isomerizations: Evidence for a 1,2 or 1,3 hydrogen migration

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Abstract
Vibrationally excited pentyl‐1, ‐2, and ‐3 radicals were formed selectively by the addition of thermal H atoms to the various pentene isomers with approximately 47 kcal/mole of vibrational energy. Decomposition products other than those expected, along with their pressure dependences, support the fact that either 1,2 or 1,3 hydrogen migrations with either a 3‐ or 4‐member cyclic transition state is occurring with a ka of approximately 3 × 105 or 6 × 105 sec−1. A corresponding critical energy of 33 or 31 kcal/mole is found.