Ab initio calculations indicate that the ring-opening of the cyclopropyl radical is formally forbidden in both the conrotatory and disrotatory modes, but that if distortion of the molecule occurs a near-disrotatory reaction would be preferred.
L. Farnell and W. G. Richards, J. Chem. Soc., Chem. Commun., 1973, 334 DOI: 10.1039/C39730000334
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