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Epoxidation of the Z-enone is very slow to complete and the epoxide is isolated in a fairly low yield. The mechanism involves conjugate addition and ring closure with cleavage of the weak O-O bond. The closure of the three-membered ring is fast enough to preserve the stereochemistry of the intermediate enolate.
T. Hashimoto and K. Maruoka, Chem. Rev., 2007, 107, 5656–5682.
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