Comparison of the Arrhenius parameters for the ring-opening of 1-bromomethyl-4-chlorobicyclo[2,2,0]hexane with those for the 1-methyl and 1-ethyl derivatives indicates a reduction in EA of 2·5 and 2·9 kcal/mol respectively, evidence for a bridged transition state in the formation of β-bromoalkyl radicals.
E. N. Cain and R. K. Solly, J. Chem. Soc., Chem. Commun., 1974, 148 DOI: 10.1039/C39740000148
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