The acetate ester of 2‐(2H‐benzotriazol‐2‐yl)‐4‐methyl phenol [Tinuvin P] upon irradiation, either in methylene chloride solution or in poly(methyl methacrylate) films, undergoes a photocleavage reaction to regenerate Tinuvin P. No photo‐Fries rearrangement product can be detected.
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Li et al. (1983) studied this question.
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