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21844487312
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Related hydrogen bonding between tetraalkylammonium and phosphonium salts of certain nitro and sulfone compounds
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0001561490
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+) as the counterion is monomeric, although the enolate oxygen atom also participates in hydrogen bonds
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34
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84891292397
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note
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-3.
-
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-
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35
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33644914006
-
-
Examples of hydrogen bonds between "carbanions" and alcohols or water: a 2-Nitrobenzyllithium·EtOH
-
Examples of hydrogen bonds between "carbanions" and alcohols or water: a) 2-Nitrobenzyllithium·EtOH: G. Klebe, K. H. Böhn, M. Marsch, G. Boche, Angew. Chem. 1987, 99, 62;
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Boche, G.4
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0039142973
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2O
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2O: C. Lambert, P. v. R. Schleyer, U. Pieper, D. Stalke, Angew. Chem. 1992, 104, 78;
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Lambert, C.1
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39
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84891336734
-
-
note
-
In all illustrations of the chiral enolate shown in this paper the (S)-configuration is arbitrarily used. Three descriptors are necessary to define the two π faces properly. In the case of the (R)-configurated compound the corresponding two hydrogen bonds to the enolate occur at the Si,Si face.
-
-
-
-
40
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84891341682
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-
We thank Y. Bautista and G. Boche (Universität Marburg) for providing their apparatus and for assistance in carrying out the cryoscopic measurements
-
We thank Y. Bautista and G. Boche (Universität Marburg) for providing their apparatus and for assistance in carrying out the cryoscopic measurements.
-
-
-
-
41
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84891323531
-
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note
-
8]THF solution of a crystalline sample of 4 are more complex than expected and point to the existence of a rapid and reversible retro-aldol process. However, the equilibrium lies far on the side of the enolate 4.
-
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-
-
42
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0001449812
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C. A. Kingsbury, D. L. Durham, R. Hutton, J. Org. Chem. 1978, 43, 4696.
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43
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0028129220
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The question of whether methyl versus phenyl is the determining factor in stereoselective reactions of olefins bearing these groups at the stereogenic allylic position has been discussed for other systems: and references cited therein
-
The question of whether methyl versus phenyl is the determining factor in stereoselective reactions of olefins bearing these groups at the stereogenic allylic position has been discussed for other systems: R. W. Hoffmann, R. Stürmer, K. Harms, Tetrahedron Lett. 1994, 35, 6263, and references cited therein.
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