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An efficient photo-Bergman reaction of aliphatic enediynes has been realized. Photolysis of 1 results in the formation of 4 in good yields along with [D2]3. Enediyne 4, which has never been isolated in the thermal reaction of 1, arises here by a retro-Bergman reaction of the diradical intermediate 2.
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Kaneko et al. (1999) studied this question.
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