Calculated (MNDO) activation barriers for ring opening of the π ground state and the low-lying σ excited state of the succinimidyl radical suggest that at room temperature only the letter can react in this way; the calculated lifetime of the σ radical agrees well that estimated from kinetic studies.
M. J. S. Dewar and S. Olivella, J. Chem. Soc., Chem. Commun., 1985, 301 DOI: 10.1039/C39850000301
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