The selectivity (the ratio of crossadducts to homodimers) in the photochemical [2 + 2] cross-cyclo-addition of a 1 : 1 mixture of several series of (E)-olefins (1) and methyl p-nitro-(E)-cinnamate (2) was found to increase regularly with decreasing ionization potential of (1).
T. Ishigami, M. Uehara, T. Murata and T. Endo, J. Chem. Soc., Chem. Commun., 1978, 786 DOI: 10.1039/C39780000786
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