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The 3(2H)-furanone 11 underwent dimerisation to 13 (71%) via the captodative radical intermediate 12 on treatment with t-butyl hydroperoxide, but similar treatment of 5-episinuleptolide (5) failed to produce the natural product 7 via the presumed radical intermediate 8. In other attempts to generate 8, irradiation of a solution of 5 in benzene led only to the corresponding E-isomer 14, and treatment...
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