Abstract— Photoisomerization and photooxygenation of all‐trans retinal in acetonitrile, illuminated by laser radiations (λact, = 333.6 or 350.7 nm), were investigated under various experimental conditions. In deoxygenated solutions, the major photoproducts are 13‐cis and 9‐cis retinal. All‐trans and 13‐cis 5,8‐peroxyretinal are obtained in large amounts in oxygenated solutions. 11‐cis derivatives have not been detected in any of these solutions. The photoproducts were identified by UV, NMR, mass and vibrational spectroscopies and HPLC chromatography. All‐trans and 13‐cis 5,8‐peroxyretinal were isolated. Their vibrational spectra (IR and Raman) are analyzed. Most of the bands are assigned by comparison with previous studies on all‐trans and 13‐cis retinal, (E,E,E)‐3‐methyl‐2,4,6‐octatrienal and peroxides.

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