Molecular orbital calculations predict that the 5-azahexenoyl radical ring closes via nucleophilic addition to the acyl carbon to afford the 5-exo product; CCSD(T)/cc-pVDZ/ /BHLYP/cc-pVDZ calculations predict energy barriers of 36.1 and 46.9 kJ mol-1 for the exo and endo cyclization modes of the 5-azahexenoyl radical, respectively.
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Falzon et al. (2002) studied this question.
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