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35348870075
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6).
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6).
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25
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35348884505
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We also carried out the same reaction using other solvents, but the yields were lower. See Supporting Information
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We also carried out the same reaction using other solvents, but the yields were lower. See Supporting Information.
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26
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0344887064
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Although significant differences in absolute values between pKa values measured in DMSO or acetonitile are expected, the relative acidities do not differ greatly. For that discussion and pKa values of organic compounds in DMSO at 25 °C, see: Bordwell, F. G. Acc. Chem. Res. 1988, 21, 456-463
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Although significant differences in absolute values between pKa values measured in DMSO or acetonitile are expected, the relative acidities do not differ greatly. For that discussion and pKa values of organic compounds in DMSO at 25 °C, see: Bordwell, F. G. Acc. Chem. Res. 1988, 21, 456-463.
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27
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6344292004
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- in MeOH: (a) Gut, R. Helv. Chim. Acta 1964, 47, 2262-2278.
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- in MeOH: (a) Gut, R. Helv. Chim. Acta 1964, 47, 2262-2278.
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29
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4 is unable to promote the Michael reaction, ruling out the role of sodium cation as Lewis acid.
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4 is unable to promote the Michael reaction, ruling out the role of sodium cation as Lewis acid.
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30
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0000247517
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Sulfones have been described as poor Lewis bases: Carr, R. V.; Paquette, L. A. J. Am. Chem. Soc. 1980, 102, 853-855.
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Sulfones have been described as poor Lewis bases: Carr, R. V.; Paquette, L. A. J. Am. Chem. Soc. 1980, 102, 853-855.
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31
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0027517742
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For Lewis acid catalysis in Michael additions, see: a
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For Lewis acid catalysis in Michael additions, see: (a) Bonadies, F.; Lattanzi, A.; Orelli, L. R.; Pesci, S.; Scettri, A. Tetrahedron Lett. 1993, 34, 7649-7650.
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(e) Itoh, K.; Oderaotoshi, Y.; Kanemasa, S. Tetrahedron: Asymmetry 2003, 14, 635-639.
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37
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0041663725
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4544301719
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42
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0037178490
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Michael donor 15 was obtained as 9:1 mixture of E:Z diastereomers: Fernández-Rivas, C.; Méndez, M.; Nieto-Oberhuber, C.; Echavarren, A. M. J. Org. Chem. 2002, 67, 5197-5201.
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Michael donor 15 was obtained as 9:1 mixture of E:Z diastereomers: Fernández-Rivas, C.; Méndez, M.; Nieto-Oberhuber, C.; Echavarren, A. M. J. Org. Chem. 2002, 67, 5197-5201.
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