Each of the radicals, hex-5-enyl, hept-6-enyl, and oct-7-enyl, undergoes intramolecular addition preferentially in that direction which affords the cyclo-alkylcarbinyl radical, because both enthalpy and entropy factors are more favourable; an approximate rate constant for 1,5-hydrogen atom transfer in hept-6-enyl radical has been determined.
A. L. J. Beckwith and G. Moad, J. Chem. Soc., Chem. Commun., 1974, 472 DOI: 10.1039/C39740000472
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