Electrocyclized retinal.

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Abstract
During studies on (Z)-(E) isomerization of retinals directed towards clarifying early stages of the visual process, the formation of a heretofore unknown photoproduct was noted in the irradiated mixture of all-(E)-retinal (I) in an acetonitrile solution. The direct irradiation of I and of all-(E)-.beta.-ionylidenecrotonaldehyde to give the 1st example of the 6e-electrocyclized conjugated polyenal [2 compounds] respectively, is described. The preferred direction of photochemical reaction other than (Z)-(E) isomerization is 6e-electrocyclization upon direct irradiation of all-(E)-retinal, while neither sigmatropic rearrangement nor photo-Diels-Alder reaction proceed in any instance.

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