An oxetan is formed via an exciplex from the reaction of singlet-excited phenanthrene with ground-state dimethyl fumarate; the formation of cyclobutane adducts is preceded by intersystem crossing in the exciplex as well as via triplet phenanthrene.
S. Farid, J. C. Doty and J. L. R. Williams, J. Chem. Soc., Chem. Commun., 1972, 711 DOI: 10.1039/C39720000711
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