The permutation patterns followed in the phototransposition of 2-cyano- to 3-cyanopyrroles have been defined and show that the nitrogen atom and C(5) interchange in the reaction; a mechanism involving initial 2,5-bonding followed by a skeletal rearrangement is proposed.
J. Barltrop, A. C. Day, P. D. Moxon and R. R. Ward, J. Chem. Soc., Chem. Commun., 1975, 786 DOI: 10.1039/C39750000786
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