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Strategically different routes to sterically homogeneous γ-alkylidenebutenolides appear to be limited to the Z-butenolides. Kinetically controlled Z selectivities were reported for mercurylactonizations of ynoic carboxylic acids (M. Yamamoto, J. Chem. Soc. Perkin Trans. 1, 1981, 582-587), iodolactonizations of allenyl carboxylic acids (S. Tsuboi, H Wada, S. Mimiira, A. Takeda, Chem. Lett. 1987, 937-938), and Pd(II)-catalyzed lactonizations of ynoic carboxylic acids (X. Lu, X. Huang, S. Ma, Tetrahedron Lett 1993, 34, 5963-5966; M. Kotora, E.-i. Negishi, Synthesis 1997, 121-128; H. Mori, H. Kubo, H. Hara, S. Katsumura, Tetrahedron Lett. 1997, 38, 5311-5312; F. Liu, E.-i. Negishi, 9th IUPAC Symposium on Organometallic Chemistry Directed Towards Organic Synthesis, Göttingen, Germany, July 20-25, 1997, poster 161).
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Strategically different routes to sterically homogeneous γ-alkylidenebutenolides appear to be limited to the Z-butenolides. Kinetically controlled Z selectivities were reported for mercurylactonizations of ynoic carboxylic acids (M. Yamamoto, J. Chem. Soc. Perkin Trans. 1, 1981, 582-587), iodolactonizations of allenyl carboxylic acids (S. Tsuboi, H Wada, S. Mimiira, A. Takeda, Chem. Lett. 1987, 937-938), and Pd(II)-catalyzed lactonizations of ynoic carboxylic acids (X. Lu, X. Huang, S. Ma, Tetrahedron Lett 1993, 34, 5963-5966; M. Kotora, E.-i. Negishi, Synthesis 1997, 121-128; H. Mori, H. Kubo, H. Hara, S. Katsumura, Tetrahedron Lett. 1997, 38, 5311-5312; F. Liu, E.-i. Negishi, 9th IUPAC Symposium on Organometallic Chemistry Directed Towards Organic Synthesis, Göttingen, Germany, July 20-25, 1997, poster 161).
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