The UV illumination of title compounds 3a,b in acetonitrile solutions leads to corresponding five-membered ring isomers 4a,b, probably, via open-ring intermediates, whereas the photocolouration was observed in the solid state.
J. Kroulik, J. Cejka, P. Sebek, P. Sedmera, P. Halada, V. Havlicek, S. Nespurek, B. Kratochvil and J. Kuthan, Mendeleev Commun., 2001, 11, 90 DOI: 10.1070/MC2001v011n03ABEH001430
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