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Hoppe, D.1
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For review see:. Hodgson D.M. (Ed), Springer, Berlin
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For review see:. Toru T., and Nakamura S. In: Hodgson D.M. (Ed). Top. Organomet. Chem. Vol. 5 (2003), Springer, Berlin 177-216
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Hoffmann R.W., Julius M., Chemla F., Ruhland T., and Frenzen G. Tetrahedron 50 (1994) 6049-6060
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Hoppe D., Kaiser B., Stratmann O., and Fröhlich R. Angew. Chem., Int. Ed. 36 (1997) 2784-2786
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Stratmann O., Kaiser B., Fröhlich R., Meyer O., and Hoppe D. Chem. Eur. J. 7 (2001) 423-435
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Marr F., Fröhlich R., Wibbeling B., Diedrich C., and Hoppe D. Eur. J. Org. Chem. (2002) 2970-2988
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Nakamura S., Nakagawa R., Watanabe Y., and Toru T. Angew. Chem., Int. Ed. 39 (2000) 353-355
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0033623224
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For dynamic thermodynamic resolution, see:
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For dynamic thermodynamic resolution, see:. Beak P., Anderson D.R., Curtis M.D., Laumer J.M., Pippel D.J., and Weisenburger G.A. Acc. Chem. Res. 33 (2000) 715-727
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Pippel, D.J.5
Weisenburger, G.A.6
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For recent examples, see:
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For recent examples, see:. Nakamura S., Ito Y., Wang L., and Toru T. J. Org. Chem. 69 (2004) 1581-1589
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Nakamura, S.1
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43
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36148954592
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For the first example using catalytic amounts of bis(oxazoline) ligands, see:
-
For the first example using catalytic amounts of bis(oxazoline) ligands, see:. Nakamura S., Hirata N., Kita T., Yamada R., Nakane D., Shibata N., and Toru T. Angew. Chem. 119 (2007) 7792-7794
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Nakamura, S.1
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Kita, T.3
Yamada, R.4
Nakane, D.5
Shibata, N.6
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Nakamura S., Hirata N., Kita T., Yamada R., Nakane D., Shibata N., and Toru T. Angew. Chem., Int. Ed. 46 (2007) 7648-7650
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Nakamura, S.1
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Kita, T.3
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Nakane, D.5
Shibata, N.6
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50
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24644464756
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Otte R., Fröhlich R., Wibbeling B., and Hoppe D. Angew. Chem., Int. Ed. 44 (2005) 5492-5496
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34250728181
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For a review on organosulfur compounds as electrophiles in transition metal-catalyzed reactions, see:
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For a review on organosulfur compounds as electrophiles in transition metal-catalyzed reactions, see:. Dubbaka S.R., and Vogel P. Angew. Chem. 117 (2005) 7848-7859
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Examples for cross-coupling reactions of organyl aryl sulfides, see:
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Examples for cross-coupling reactions of organyl aryl sulfides, see:. Okamura H., Miura M., and Takei H. Tetrahedron Lett. 20 (1979) 43-46
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For a recent example of enantioselective synthesis of allenes by asymmetric lithiation and substitution, see:
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For a recent example of enantioselective synthesis of allenes by asymmetric lithiation and substitution, see:. Bou Chedid R., Brümmer M., Wibbeling B., Fröhlich R., and Hoppe D. Angew. Chem. 119 (2007) 3192-3195
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In: Krause N., and Hashmi A.S.K. (Eds). Modern Allene Chemistry (2004), Wiley-VCH, Weinheim
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64
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3 using a modification of the method described by Lu:
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3 using a modification of the method described by Lu:. Zhao L., Lu X., Xu W. J. Org. Chem. 70 (2005) 4059-4063
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37049089336
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For the preparation of 4,4-dimethyl-but-2-yn-1-ol, see:
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For the preparation of 4,4-dimethyl-but-2-yn-1-ol, see:. MacInnes I., and Walton J.C. J. Chem. Soc., Perkin Trans. 2 (1987) 1077-1082
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An asymmetric transformation describes the conversion of a racemate into a pure enantiomer or into a mixture in which one enantiomer is present in excess, or of a diastereomeric mixture into a single diastereoisomer or into a mixture in which one diastereomer predominates. If the two enantiomers of a chiral substrate A are freely interconvertible, and if an equal amount of excess of a non-racemizing second enantiomerically pure chemical species, say (R)-B, is added to a solution of racemic A, then the resulting equilibrium mixture of adducts A·B will, in general, contain unequal amounts of diastereoisomers (R)-A·(R)-B and (S)-A·(R)-B. The result of this equilibration is called asymmetric transformation of the first kind. See. In: McNaught A.D., and Wilkinson A. (Eds).IUPAC Compendium of Chemical Terminology. 2nd ed. (1997), Blackwell Science
-
An asymmetric transformation describes the conversion of a racemate into a pure enantiomer or into a mixture in which one enantiomer is present in excess, or of a diastereomeric mixture into a single diastereoisomer or into a mixture in which one diastereomer predominates. If the two enantiomers of a chiral substrate A are freely interconvertible, and if an equal amount of excess of a non-racemizing second enantiomerically pure chemical species, say (R)-B, is added to a solution of racemic A, then the resulting equilibrium mixture of adducts A·B will, in general, contain unequal amounts of diastereoisomers (R)-A·(R)-B and (S)-A·(R)-B. The result of this equilibration is called asymmetric transformation of the first kind. If, in such a system, the adducts differ considerably in solubility so that only one of them, say (R)-A·(R)-B, crystallizes from the solution, then the equilibration of diastereoisomers in solution and concurrent crystallization will continue so that all (or most) of the substrate A can be isolated as the crystalline diastereoisomer (R)-A·(R)-B. Such a 'crystallization-induced asymmetric transformation' is called an asymmetric transformation of the second kind. See. In: McNaught A.D., and Wilkinson A. (Eds). IUPAC Compendium of Chemical Terminology. 2nd ed. (1997), Blackwell Science
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IUPAC Compendium of Chemical Terminology. 2nd ed.
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68
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0001854238
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For the first example of an asymmetric transformation of the second kind in lithium carbanion chemistry, see:
-
For the first example of an asymmetric transformation of the second kind in lithium carbanion chemistry, see:. Hoppe D., and Zschage O. Angew. Chem. 101 (1989) 67-71
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Hoppe, D.1
Zschage, O.2
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36148981735
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note
-
Data sets were collected with a Nonius KappaCCD diffractometers. Programs used: data collection COLLECT (Nonius B. V., 1998), data reduction Denzo-SMN (Otwinowski, Z.; Minor, W. Methods in Enzymology 1997, 276, 307-326), absorption correction Denzo (Otwinowski, Z.; Borek, D.; Majewski, W.; Minor, W. Acta Crystallogr. 2003, A59, 228-234), structure solution shelxs-97 (Sheldrick, G. M.; Acta Crystallogr. 1990, A46, 467-473), structure refinement shelxl-97 (Sheldrick, G. M. Universität Göttingen, 1997), graphics SCHAKAL (Keller, E. Universität Freiburg, 1997). CCDC 656888 (11a) and CCDC 656889 (16aa) contain the supplementary crystallographic data for this Letter. These data can be obtained free of charge at www.ccdc.cam.ac.uk/conts/retrieving.html [or from the Cambridge Crystallographic Data Centre, 12 Union Road, Cambridge CB2 1EZ, UK; fax: (internat.) +44 (1223) 336 033, e-mail: deposit@ccdc.cam.ac.uk].
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72
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36148968721
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note
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-3, hydrogen atoms calculated and refined as riding atoms.
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-
-
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73
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7044261570
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Seppi M., Kalkofen R., Reupohl J., Fröhlich R., and Hoppe D. Angew. Chem. 116 (2004) 1447-1451
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Seppi, M.1
Kalkofen, R.2
Reupohl, J.3
Fröhlich, R.4
Hoppe, D.5
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74
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4544265506
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Seppi M., Kalkofen R., Reupohl J., Fröhlich R., and Hoppe D. Angew. Chem., Int. Ed. 43 (2004) 1423-1427
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Angew. Chem., Int. Ed.
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Seppi, M.1
Kalkofen, R.2
Reupohl, J.3
Fröhlich, R.4
Hoppe, D.5
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75
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36148958165
-
-
note
-
3 over a period of 10 min compared to the addition at once) showed no evidence for dynamic kinetic resolution.
-
-
-
-
76
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36148943831
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note
-
The corresponding titanated S-2-alkynyl thiocarbamates and O-2-alkynyl carbamates 2 are configurationally stable at -78 °C.
-
-
-
-
77
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36148983324
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-
note
-
3 up to 4 h.
-
-
-
-
78
-
-
36148960401
-
-
note
-
16b failed.
-
-
-
-
79
-
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36148937057
-
-
note
-
The configuration of the double bond was determined by NOE-experiments.
-
-
-
-
80
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0000572544
-
-
Erdik E. Tetrahedron 43 (1987) 2203-2212
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(1987)
Tetrahedron
, vol.43
, pp. 2203-2212
-
-
Erdik, E.1
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81
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36148997553
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note
-
NMR analysis of the crude product gave no hints for the existence or non-existence of a second diastereomer.
-
-
-
-
82
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36148939036
-
-
note
-
-3, hydrogen atoms calculated and refined as riding atoms.
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-
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