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For recent studies in racemic series on the Michael of nitronates see, inter alia: Francke, W.; Schröder, F.; Walter, F.; Sinnwell, V.; Baumann, H.; Kaib, M. Liebigs Ann. 1995, 965. Thomas, A.; Rajappa, S. Tetrahedron 1995, 51, 10571. Ballini, R.; Marziali, P.; Mozzicafreddo, A J. Org. Chem. 1996, 61, 3209. Marti, R. E.; Helnzer, J.; Seebach, D. Liebigs Ann. Chem. 1995, 7, 1193.
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2O in THF can lead to a decrease in the chemical yield
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2O in THF can lead to a decrease in the chemical yield.
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1H NMR that for E-enoates bearing an alkoxy group at the stereogenic center the main conformer has H-3 (at the olefinic β-carbon) and H-4 (at the stereogenic center) in an antiperiplanar relationship: Gung, B. W.; Melnick, J. P.; Wolf, M. A.; King, A. J. Org. Chem. 1995, 60, 1947 and references cited therein. The s-cis/s-trans conformational preferences of the ester group in enoates has been studied by supersonic jet spectroscopy, NOE, and X-ray analyses: Shida, N.; Kabuto, C.; Niwa, T.; Ebata, T.; Yamamoto, Y. J. Org. Chem. 1994, 59, 4068.
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1H NMR that for E-enoates bearing an alkoxy group at the stereogenic center the main conformer has H-3 (at the olefinic β-carbon) and H-4 (at the stereogenic center) in an antiperiplanar relationship: Gung, B. W.; Melnick, J. P.; Wolf, M. A.; King, A. J. Org. Chem. 1995, 60, 1947 and references cited therein. The s-cis/s-trans conformational preferences of the ester group in enoates has been studied by supersonic jet spectroscopy, NOE, and X-ray analyses: Shida, N.; Kabuto, C.; Niwa, T.; Ebata, T.; Yamamoto, Y. J. Org. Chem. 1994, 59, 4068.
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15b The calculation of transition states for the addition of nitronates to these conformers is under investigation. Amorim, M. B.; Filho, U. F.; Lima, P. G.; Costa, P. R. R. Unpublished results.
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