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For recent reports on the synthesis of alkylidene cyclopentenones, see: Herndon, J. W.; Zhu, J.; Sampedro, D. Tetrahedron 2000, 56, 4985 and references therein. Hashmi, A. S. K.; Bats, J. W.; Choi, J.-H.; Schwarz, L. Tetrahedron Lett. 1998, 39, 7491 and references therein.
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note
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6).
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