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c) K. Schellhaas, H.-G. Schmalz, J. W. Bats, Chem. Eur. J. 1998, 4, 57;
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Selected recent work from other laboratories: a) A. Quattropani, G. Anderson, G. Bernardinelli, E. P. Kündig, J. Am. Chem. Soc. 1997, 119, 4773;
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b) B. Crousse, L. H. Xu, G. Bernardinelli, E. P. Kündig, Synlett 1998, 658;
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d) B. Voigt, M. Brands, R. Goddard, R. Wartchow, H. Butenschön, Eur. J. Org. Chem. 1998, 2719;
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a) H.-G. Schmalz, S. Siegel, J. W. Bats, Angew. Chem. 1995, 107, 2597; Angew. Chem. Int. Ed. Engl. 1995, 34, 2383;
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a) H.-G. Schmalz, S. Siegel, J. W. Bats, Angew. Chem. 1995, 107, 2597; Angew. Chem. Int. Ed. Engl. 1995, 34, 2383;
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A. Pfletschinger, T. K. Dargel, H.-G. Schmalz, W. Koch, Chem. Eur. J. 1999, 5, 537.
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24
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0345227578
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note
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The calculations were carried out with Gaussian 94 by using the hybrid density functional Becke3LYP with an all-electron basis set (Wachters) for the chromium atom (including f functions) and the split-valence basis set D95 for C, H, and O extended with polarization functions. For details of the computational strategy, see ref. [6].
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26
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0011051052
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Eds. E. L. Eliel, S. H. Wilen, Wiley, New York
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Very few radical reactions have been described which proceed with "memory of chirality"; for a review, see a) N. A. Porter, P. J. Krebs in Topics in Stereochemistry, Vol. 18 (Eds. E. L. Eliel, S. H. Wilen), Wiley, New York 1988, p. 97; for a recent example, see
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Topics in Stereochemistry
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Porter, N.A.1
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0032575148
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b) S. Sauer, A. Schumacher, F. Barbosa, B. Giese, Tetrahedron Lett. 1998, 39, 3685; for examples of "memory of chirality" in enolate chemistry, see ref. [18] as well as:
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Sauer, S.1
Schumacher, A.2
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29
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0030005806
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See refs. [5a,f] as well as: a) H.-G. Schmalz, S. Siegel, A. Schwarz, Tetrahedron Lett. 1996, 37, 2947;
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Schmalz, H.-G.1
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31
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0039698944
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3-complexed benzylic anions, see S. E. Gibson, M. J. Schneider, M. H. Smith, Chem. Commun. 1996, 839; for a computational study, see ref. [6].
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Chem. Commun.
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Gibson, S.E.1
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Smith, M.H.3
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32
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0001232019
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For the origins of the term "umpolung", see a) D. Seebach, Angew. Chem. 1969, 81, 690; Angew. Chem. Int. Ed. Engl. 1969, 8, 639;
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Seebach, D.1
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33
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84981810671
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For the origins of the term "umpolung", see a) D. Seebach, Angew. Chem. 1969, 81, 690; Angew. Chem. Int. Ed. Engl. 1969, 8, 639;
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34
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0001728892
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b) D. Seebach, Angew. Chem. 1979, 91, 259; Angew. Chem. Int. Ed. Engl. 1979, 18, 239.
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b) D. Seebach, Angew. Chem. 1979, 91, 259; Angew. Chem. Int. Ed. Engl. 1979, 18, 239.
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36
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0000987736
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(R)-6 was prepared from acetophenone by enantioselective, oxazaborolidine-catalyzed borane reduction; for a recent review, see E. J. Corey, C. Helal, Angew. Chem. 1998, 110, 2093; Angew. Chem. Int. Ed. 1998, 37, 1986.
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Corey, E.J.1
Helal, C.2
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37
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0032541271
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(R)-6 was prepared from acetophenone by enantioselective, oxazaborolidine-catalyzed borane reduction; for a recent review, see E. J. Corey, C. Helal, Angew. Chem. 1998, 110, 2093; Angew. Chem. Int. Ed. 1998, 37, 1986.
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-
-
-
40
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0344364849
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note
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The enantiomeric excess was determined on a Daicel Chiralcel OJ column with hexane/isopropanol mixtures as eluant.
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41
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0032486293
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[2c] for a recent report, see U. Englert, A. Salzer, D. Vasen, Tetrahedron Asymmetry 1998, 9, 1867.
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D. Seebach, A. R. Sting, M. Hoffmann, Angew. Chem. 1996, 108, 2880; Angew. Chem. Int. Ed. Engl. 1996, 35, 2708.
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Seebach, D.1
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43
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0030513164
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D. Seebach, A. R. Sting, M. Hoffmann, Angew. Chem. 1996, 108, 2880; Angew. Chem. Int. Ed. Engl. 1996, 35, 2708.
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44
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0344596909
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Ed.: D. Goldsmith, Wiley, New York
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For previous syntheses of nonracemic α-curcumene, see a) M. C. Pirrung, A. T. Morehead, Jr. in The Total Synthesis of Natural Products, Vol. 10 (Ed.: D. Goldsmith), Wiley, New York 1997, p. 29, and references therein; for a more recent synthesis of (+)-α-curcumene (15), see
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Pirrung, M.C.1
Morehead A.T., Jr.2
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46
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0344796700
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note
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[19]
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47
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0344364844
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note
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-1.
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