7-Oxabicyclo[4,3,0]nona-2,4,8-triene formed by irradiation of cyclo-octatetraene oxide is the cis-isomer, and undergoes photoisomerization, without visible electrocyclic isomerization, principally to cycloheptatriene and cycloheptatrienecarbaldehydes.
J. M. Holovka, R. R. Grabbe, P. D. Gardner, C. B. Strow, M. L. Hill and T. V. Van Auken, J. Chem. Soc. D, 1969, 1522 DOI: 10.1039/C29690001522
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