The photocycloaddition of cyclohepta-1,3,5-triene to 9-cyanoanthracene yielded a 4πs+ 2πs adduct (1a) and a 4πs+ 4πs adduct (2a) which are formed from different reaction pathways.
N. C. Yang and K. Srinivasachar, J. Chem. Soc., Chem. Commun., 1976, 48b DOI: 10.1039/C3976000048B
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