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2 vinyl group in elemanes is highly stereoselective and occurs preferentially from the β side of the molecule (re side of the double bond): [14a] G. Blay, L. Cardona, B. García, J. R. Pedro, Can. J. Chem. 1992, 70, 817-822.
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30
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12944275189
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note
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Configuration at C-2 was determined by NOE experiments. Irradiation at 2-H caused enhancement of the 10-Me group in compounds 7a and 8a, but not in compounds 7b and 8b.
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