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The photoisomerization of imine compounds is studied in terms of an ab initio MO CI calculation. The potential curves of the syn‐anti isomerization via the rotation and the inversion are examined for benzaldimine. It is suggested that the photoisomerization is initiated through the rotation around the CN bond in both singlet and triplet states. The ease of the photoisomerization is found to be determined by both the conformation of phenyl ring in the ground state and the energy difference of vertically excited states between two isomers.
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Osamura et al. (1980) studied this question.
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