The cis enedi-imine (4a) obtained from the irradiation of 1,3-diazabicyclo[3,1,0]hex-3-ene (3) undergoes a novel thermal cyclization to a diazacyclohepta-diene; the isomeric trans-enedi-imine (4b) is photochemically converted into a diazachrysene derivative.
A. Padwa and S. I. Wetmore, J. Chem. Soc., Chem. Commun., 1972, 1116 DOI: 10.1039/C39720001116
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