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The reaction of 2-aryl-2,3-epoxy acylates with Lewis acids was examined in detail. Cyclic 2-aryl-2,3-epoxy acylates afforded the rearranged products via the C2-carbocation intermediates obtained by the C2-cleavage of the oxirane rings. On the other hand, acyclic 2-aryl-2,3-epoxy acylates gave the rearranged products via the phenonium ion intermediates obtained by the C3-cleavage of the oxirane rings...
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