Cyclobutenylmethyl radicals undergo homolytic ring fission at temperatures above 230 K to give EE pentadienyl radicals; the unrearranged and rearranged radicals have been observed by e.s.r. spectroscopy.
K. U. Ingold and J. C. Walton, J. Chem. Soc., Chem. Commun., 1980, 604 DOI: 10.1039/C39800000604
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