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Dimerization using SmI2: a) Girard P.; Couffignal R.; Kagan H. B. Tetrahedron Lett., 22, 3959 (1981). b) Namy J. L.; Kagan H. B. Tetrahedron Lett., 24, 765 (1983). c) Enholm E. J.; Forbes D. C.; Holub D. P. Synth. Commun., 20, 981 (1990). d) Imamoto T.; Nishimura S. Chem. Lett., 1141 (1990). e) Inanaga J.; Handa Y.; Tabuchi T.; Otsubo K.; Yamaguchi M.; Hanamoto T. Tetrahedron Lett., 32, 6557 (1991). f) Liu Y.-S.; Bei M.-Z.; Zhou Z.-H.; Takaki K.; Fujiwara Y. Chem. Lett., 1143 (1992). g) Shiue J.-S.; Lin C.-C.; Fang J.-M. Tetrahedron Lett., 34, 335 (1993).
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Dimerization using SmI2: a) Girard P.; Couffignal R.; Kagan H. B. Tetrahedron Lett., 22, 3959 (1981). b) Namy J. L.; Kagan H. B. Tetrahedron Lett., 24, 765 (1983). c) Enholm E. J.; Forbes D. C.; Holub D. P. Synth. Commun., 20, 981 (1990). d) Imamoto T.; Nishimura S. Chem. Lett., 1141 (1990). e) Inanaga J.; Handa Y.; Tabuchi T.; Otsubo K.; Yamaguchi M.; Hanamoto T. Tetrahedron Lett., 32, 6557 (1991). f) Liu Y.-S.; Bei M.-Z.; Zhou Z.-H.; Takaki K.; Fujiwara Y. Chem. Lett., 1143 (1992). g) Shiue J.-S.; Lin C.-C.; Fang J.-M. Tetrahedron Lett., 34, 335 (1993).
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Dimerization using SmI2: a) Girard P.; Couffignal R.; Kagan H. B. Tetrahedron Lett., 22, 3959 (1981). b) Namy J. L.; Kagan H. B. Tetrahedron Lett., 24, 765 (1983). c) Enholm E. J.; Forbes D. C.; Holub D. P. Synth. Commun., 20, 981 (1990). d) Imamoto T.; Nishimura S. Chem. Lett., 1141 (1990). e) Inanaga J.; Handa Y.; Tabuchi T.; Otsubo K.; Yamaguchi M.; Hanamoto T. Tetrahedron Lett., 32, 6557 (1991). f) Liu Y.-S.; Bei M.-Z.; Zhou Z.-H.; Takaki K.; Fujiwara Y. Chem. Lett., 1143 (1992). g) Shiue J.-S.; Lin C.-C.; Fang J.-M. Tetrahedron Lett., 34, 335 (1993).
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Dimerization using SmI2: a) Girard P.; Couffignal R.; Kagan H. B. Tetrahedron Lett., 22, 3959 (1981). b) Namy J. L.; Kagan H. B. Tetrahedron Lett., 24, 765 (1983). c) Enholm E. J.; Forbes D. C.; Holub D. P. Synth. Commun., 20, 981 (1990). d) Imamoto T.; Nishimura S. Chem. Lett., 1141 (1990). e) Inanaga J.; Handa Y.; Tabuchi T.; Otsubo K.; Yamaguchi M.; Hanamoto T. Tetrahedron Lett., 32, 6557 (1991). f) Liu Y.-S.; Bei M.-Z.; Zhou Z.-H.; Takaki K.; Fujiwara Y. Chem. Lett., 1143 (1992). g) Shiue J.-S.; Lin C.-C.; Fang J.-M. Tetrahedron Lett., 34, 335 (1993).
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Dimerization using SmI2: a) Girard P.; Couffignal R.; Kagan H. B. Tetrahedron Lett., 22, 3959 (1981). b) Namy J. L.; Kagan H. B. Tetrahedron Lett., 24, 765 (1983). c) Enholm E. J.; Forbes D. C.; Holub D. P. Synth. Commun., 20, 981 (1990). d) Imamoto T.; Nishimura S. Chem. Lett., 1141 (1990). e) Inanaga J.; Handa Y.; Tabuchi T.; Otsubo K.; Yamaguchi M.; Hanamoto T. Tetrahedron Lett., 32, 6557 (1991). f) Liu Y.-S.; Bei M.-Z.; Zhou Z.-H.; Takaki K.; Fujiwara Y. Chem. Lett., 1143 (1992). g) Shiue J.-S.; Lin C.-C.; Fang J.-M. Tetrahedron Lett., 34, 335 (1993).
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Dimerization using SmI2: a) Girard P.; Couffignal R.; Kagan H. B. Tetrahedron Lett., 22, 3959 (1981). b) Namy J. L.; Kagan H. B. Tetrahedron Lett., 24, 765 (1983). c) Enholm E. J.; Forbes D. C.; Holub D. P. Synth. Commun., 20, 981 (1990). d) Imamoto T.; Nishimura S. Chem. Lett., 1141 (1990). e) Inanaga J.; Handa Y.; Tabuchi T.; Otsubo K.; Yamaguchi M.; Hanamoto T. Tetrahedron Lett., 32, 6557 (1991). f) Liu Y.-S.; Bei M.-Z.; Zhou Z.-H.; Takaki K.; Fujiwara Y. Chem. Lett., 1143 (1992). g) Shiue J.-S.; Lin C.-C.; Fang J.-M. Tetrahedron Lett., 34, 335 (1993).
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For reviews: Tunemoto D.; Kondo K. J. Synth. Org. Chem., Jpn., 35, 1070 (1977). Murakami M.; Nishida S. J. Synth. Org. Chem., Jpn., 41, 22 (1983). Saigo K.; Shimada S. J. Synth. Org. Chem., Jpn., 49, 928 (1991). Nonhebel D. C. Chem. Soc. Rev., 1993, 347.
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0001938998
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Otsubo K.; Inanaga J.; Yamaguchi M. Tetrahedron Lett., 27, 5763 (1986). Otsubo K.; Kawamura K.; Inanaga J.; Yamaguchi M. Chem. Lett., 1987, 1487. Hasegawa E.; Curran D. P. Tetrahedron Lett., 34, 1717 (1993).
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85033738886
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note
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2-THF-HMPA system in the presence of proton sources but in the absence of HMPA almost no reaction or slow reduction of the double bond took place.
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30
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85033746074
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note
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1H-NMR, IR, MS, and high-resolution MS) for the compounds (2a - 2f) were obtained.
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31
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85033762065
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note
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4, and evaporated. The residue was chromatographed on preparative TLC (silica gel; AcOEt/hexane) to give the diastereomeric mixture of 2.
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