We previously examined photochemical reactions of some naturally occurring di-and trienones and their analogs, as well as the effect of complex formation with cyclodextrins on this process [1]. All these ketones had a common structural unit I (Scheme 1), and the main transformation was either carbocyclization (in the presence of cyclodextrin) or cis3trans isomerization (in the absence of cyclodextrin).
[Moiseenkov, Alexander M.; Czeskis, Boris A.; Rudashevskaya, Tatjana Yu.; Nesmeyanova, Olga A.; Semenovsky, Alexei V. Tetrahedron Letters, 1981 , vol. 22, p. 151 - 154]
