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A new synthesis of the title compound (1), an useful intermediate in the synthesis of various prostanoids, is described which involves the acid-catalyzed cyclopropane rearrangement of 9-cyclopropyl-9-oxononanoic acid (7) as a key step. The cyclopropyl ketone 7 was prepared via the three steps from cyclopropyl methyl ketone.
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Wada et al. (1977) studied this question.
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