Cyano and methoxycarbonyl substituted 4-phenoxybut-1-enes undergo specific intramolecular ortho photocycloaddition: the primary photoadducts are thermally labile and yield cyclo-octatrienes which give bicyclo[4.2.0]octa-2,7-dienes in a facile secondary photoreaction.
K. B. Cosstick, M. G. B. Drew and A. Gillbert, J. Chem. Soc., Chem. Commun., 1987, 1867 DOI: 10.1039/C39870001867
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