Irradiation of cis- (amarine) and trans- (isoamarine) 2,4,5-triphenylimidazolines in acetonitrile or benzene gave a photostationary mixture of cis- and trans-isomers. On irradiation in a dilute acetone solution, cis,trans-isomerization occurred only with isoamarine but not with amarine. In acetone, 2,4,5-triphenylimidazole was also formed. Two modes of mechanisms are proposed.
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Matsuura et al. (1972) studied this question.
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