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84889513694
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note
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1H NMR spectra with those of the authentic sample of 1 and 1′ that were synthesized by the use of the known methods (It is well documented that benzylation of the β-benzyl-γ-butyrolantones 4 afforded the trans-dibenzyllactones 1 exclusively and hydrogenation of the α-benzylidene-β-benzyl-γ-butyrolantones 3 afforded the cisisomers 1′ exclusively: See, Refs. 3c, 3d, 3e, and 3f).
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47
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TRIPOS, Inc., 1699 S. Hanley Road, St. Louis, Missouri 63144-2913
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TRIPOS, Inc., 1699 S. Hanley Road, St. Louis, Missouri 63144-2913.
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49
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0025253529
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Takahashi and Tsuji reported that the stereoselectivity observed in protonation of the metal enolate of 3-alkyl-2-methyl-1-acetylcyclopentene, prepared by conjugate addition of vinyl group, could be rationalized by MM2 calculations. They fixed the position of the proton donor 2.5 Å above or below the α-carbon of the metal enolate, and optimized the geometry for the rest of the system: H. Yamada, K. Shimizu, M. Nisar, T. Takahashi, and J. Tsuji, Tetrahedron Lett., 31, 2407 (1990).
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