The irradiation of exo- and/or endo-2,4,6-triphenyl-1,3-diazabicyclo[3,1,0]hex-3-ene in methanol to give 2,4-diphenyl-1-methoxybenzylimidazoline proceeds via photochemical ring opening to an enedi-imine which undergoes subsequent intramolecular nucleophilic addition at the imine carbon atom; the solvent controls the mode of cyclization.
A. Padwa and E. Glazer, J. Chem. Soc. D, 1971, 838 DOI: 10.1039/C29710000838
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