Substitution of the cyano group occurs when either 4-cyanopyridine or 2-cyanoquinoline is irradiated at 254 nm with 2,3-dimethylbut-2-ene, leading to (1) and (2) or (3) and (4), respectively, without forming cyclic photoadducts.
T. Caronna, S. Morrocchi, P. Traldi and B. M. Vittimberga, J. Chem. Soc., Chem. Commun., 1979, 64a DOI: 10.1039/C3979000064A
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