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Wenzel, A.4
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11
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0000272978
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High configurational stability has been achieved only through in situ trapping or intramolecular rearrangement, see a) P. G. McDougal, B. D. Condon, M. D. Laffosse, Jr., A. M. Lauro, D. VanDerveer, Tetrahedron Lett. 1988, 29, 2547-2550;
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McDougal, P.G.1
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Vanderveer, D.5
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15
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0000437070
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An example of a dipole-stabilized α-thiobenzyllithium compound that is configurationally stable in diethyl ether is known, see D. Hoppe, B. Kaiser, O. Stratmann, R. Fröhlich, Angew. Chem. 1997, 109, 2872-2874; Angew. Chem. Int. Ed. Engl. 1997, 36, 2784-2786.
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Hoppe, D.1
Kaiser, B.2
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Fröhlich, R.4
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16
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0032491848
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An example of a dipole-stabilized α-thiobenzyllithium compound that is configurationally stable in diethyl ether is known, see D. Hoppe, B. Kaiser, O. Stratmann, R. Fröhlich, Angew. Chem. 1997, 109, 2872- 2874; Angew. Chem. Int. Ed. Engl. 1997, 36, 2784-2786.
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17
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84989568134
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T. Ruhland, R. Dress, R. W. Hoffmann, Angew. Chem. 1993, 105, 1487; Angew. Chem. Int. Ed. Engl. 1993, 32, 1467-1468.
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Ruhland, T.1
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84989568134
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T. Ruhland, R. Dress, R. W. Hoffmann, Angew. Chem. 1993, 105, 1487; Angew. Chem. Int. Ed. Engl. 1993, 32, 1467-1468.
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b) R. W. Hoffmann, W. Klute, R. K. Dress, A. Wenzel, J. Chem. Soc. Perkin Trans. 2 1995, 1721-1726;
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Hoffmann, R.W.1
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Dress, R.K.3
Wenzel, A.4
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22
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0033543525
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For enantioselective reactions of nondipole-stabilized α-oxycarbanions in the presence of bisoxazolines, see a) N. Komine, L. Wang, K. Tomooka, T. Nakai, Tetrahedron Lett. 1999, 40, 6809-6812;
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Komine, N.1
Wang, L.2
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Nakai, T.4
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23
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0033543757
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b) K. Tomooka, L. Wang, N. Komine, T. Nakai, Tetrahedron Lett. 1999, 40, 6813-6816. We are grateful to Prof. K. Tomooka for helpful discussions.
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Tomooka, K.1
Wang, L.2
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24
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33748608592
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a) S. E. Gibson (nèe Thomas), P. Ham, G. R. Jefferson, M. H. Smith, J. Chem. Soc. Perkin Trans. 1 1997, 2161-2162;
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Gibson, S.E.1
Ham, P.2
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25
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0032493668
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b) A. Ariffin, A. J. Blake, R. A. Ewin, N. S. Simpkins, Tetrahedron: Asymmetry 1998, 9, 2563-2566. For α-oxycarbanions see also:
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Ariffin, A.1
Blake, A.J.2
Ewin, R.A.3
Simpkins, N.S.4
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33748668254
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f) R. A. Ewin, A. M. MacLeod, D. A. Price, N. S. Simpkins, A. P. Watt, J. Chem. Soc. Perkin. Trans 1 1997, 401-415.
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Ewin, R.A.1
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Price, D.A.3
Simpkins, N.S.4
Watt, A.P.5
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30
-
-
0343898283
-
-
note
-
Reactions in diethyl ether or THE gave 2 with much lower stereoselectivity.
-
-
-
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31
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0032536002
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For enantioselective reactions using bis-oxazolines, see a) A. K. Ghosh, P. Mathivanan, J. Cappiello, Tetrahedron: Asymmetry 1998, 9, 1-45;
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Ghosh, A.K.1
Mathivanan, P.2
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0000034072
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b) S. E. Denmark, N. Nakajima, O. J.-C. Nicaise, J. Am. Chem. Soc. 1994, 116, 8797-8798;
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Denmark, S.E.1
Nakajima, N.2
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33
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c) M. Nakamura, M. Arai, E. Nakamura, J. Am. Chem. Soc. 1995, 117, 1179-1180;
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Nakamura, M.1
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35
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e) K. Tomooka, N. Komine, T. Nakai, Tetrahedron Lett. 1998, 39, 5513-5516;
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Tomooka, K.1
Komine, N.2
Nakai, T.3
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39
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0001516773
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b) J. S. Sawyer, A. Kucerovy, T. L. Macdonald, G. J. McGarvey, J. Am. Chem. Soc. 1988, 110, 842-853. There is a reaction with partial inversion, see J. Clayden, J. H. Pink, Tetrahedron Lett. 1997, 38, 2565-2568.
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J. Am. Chem. Soc.
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Sawyer, J.S.1
Kucerovy, A.2
Macdonald, T.L.3
McGarvey, G.J.4
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40
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0030942369
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b) J. S. Sawyer, A. Kucerovy, T. L. Macdonald, G. J. McGarvey, J. Am. Chem. Soc. 1988, 110, 842-853. There is a reaction with partial inversion, see J. Clayden, J. H. Pink, Tetrahedron Lett. 1997, 38, 2565-2568.
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Tetrahedron Lett.
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Clayden, J.1
Pink, J.H.2
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41
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0001507942
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M. T. Reetz, M. W. Drewes, A. Schmitz, Angew. Chem. 1987, 99, 1186-1188; Angew. Chem. Int. Ed. Engl. 1987, 26, 1141-1143.
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Reetz, M.T.1
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42
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84985516476
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M. T. Reetz, M. W. Drewes, A. Schmitz, Angew. Chem. 1987, 99, 1186-1188; Angew. Chem. Int. Ed. Engl. 1987, 26, 1141-1143.
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-
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44
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84986660138
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b) R. W. Hoffmann, M. Bewersdorf, Liebigs Ann. Chem. 1992, 643-653. Configurational instability of the α-lithiobenzyl phenyl sulfide in THF has been verified, see R. W. Hoffmann, T. Ruhl, J. Harbach, Liebigs Ann. Chem. 1992, 725-730.
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Liebigs Ann. Chem.
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Hoffmann, R.W.1
Bewersdorf, M.2
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45
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84986642233
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b) R. W. Hoffmann, M. Bewersdorf, Liebigs Ann. Chem. 1992, 643- 653. Configurational instability of the α-lithiobenzyl phenyl sulfide in THF has been verified, see R. W. Hoffmann, T. Ruhl, J. Harbach, Liebigs Ann. Chem. 1992, 725-730.
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Liebigs Ann. Chem.
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Hoffmann, R.W.1
Ruhl, T.2
Harbach, J.3
-
46
-
-
0343898275
-
-
note
-
The barrier to racemization for the α-seleno- and α-thiocarbanions having a bulky aryl group such as the duryl or mesityl group is known to be significantly higher than for those with a phenyl group, see refs.[3b, 5d]
-
-
-
-
47
-
-
0342592579
-
-
note
-
This hypothesis relies on several reactions involving the Hoffmann test as well as MO calculations and will be discussed in detail in due course.
-
-
-
-
48
-
-
0342592578
-
-
note
-
All complexes formed from the carbanions and the chiral ligands were soluble in cumene.
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