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0029994469
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Asymmetric cyclocarbolithiation reactions, using classical approaches to generate the enantioenriched, open-chain lithium intermediate: (a) I. Coldham, R. Hufton, D.J. Snowden, J. Am. Chem. Soc. 118 (1996) 5322.
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35
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0347171559
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note
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The (-)-sparteine complex of lithiomethylindene delivers carbonyl adducts with high enantiomeric excesses, but all attempts to achieve enantioselective alkylations have failed so far [13]. Despite that, (-)-sparteine was used, since better regioselectivities were observed in comparison to the lithium TMEDA complex.
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36
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0000688113
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I. Hoppe, M. Marsch, K. Harms, G. Boche, D. Hoppe, Angew. Chem. 107 (1995) 2328; Angew. Chem. Int. Ed. Engl. 34 (1995) 2158.
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Hoppe, I.1
Marsch, M.2
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Hoppe, D.5
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37
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33748615119
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I. Hoppe, M. Marsch, K. Harms, G. Boche, D. Hoppe, Angew. Chem. 107 (1995) 2328; Angew. Chem. Int. Ed. Engl. 34 (1995) 2158.
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40
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84943920736
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-3, Flack parameter -0.1(3), positional disorder at 011, refined with split positions (0.74(1): 0.26(1)), hydrogens calculated and refined as riding atoms. Data set was collected with an Enraf-Nonius CAD4 diffractometer. Programs used: data collection EXPRESS (Nonius B.V., 1994), data reduction MOLEN (K. Fair, Enraf-Nonius B.V., 1990), structure solution SHELXS-97 (G.M. Sheldrick, Acta Crystallogr., Sect. A 46 (1990) 467), structure refinement SHELXL-97 (G.M. Sheldrick, Universität Göttingen, 1997), graphics SCHAKAL (E. Keller, Universität Freiburg, 1997).
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Acta Crystallogr., Sect. A
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Sheldrick, G.M.1
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41
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0345910181
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note
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-1 in favour of the observed reaction path. However, for the sake of simplicity, the ligand (-)-sparteine was removed from the model compounds.
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44
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0000679903
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(c) P. Beak, A. Basu, D.J. Gallagher, Y.S. Thayumanavan, Acc. Chem. Res. 29 (1996) 552.
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Beak, P.1
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47
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0343147529
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(a) D. Hoppe, M. Paetow, F. Hintze, Angew. Chem. 105 (1993) 430; Angew. Chem. Int. Ed. Engl. 32 (1993) 394.
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48
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0002664745
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(b) M. Paetow, M. Kotthaus, M. Grehl, R. Fröhlich, D. Hoppe, Synlett (1994) 1034.
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Paetow, M.1
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49
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0033021851
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(c) S. Norsikian, I. Marek, S. Klein, J.F. Poisson, J.F. Normant, Chem. Eur. J. 5 (1999) 2055.
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Norsikian, S.1
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Poisson, J.F.4
Normant, J.F.5
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50
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0347801581
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note
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The configuration and the enantiomeric purity of (-)-18 or of its precursors could not be assessed. In analogy to the cyclopropane 14, the proposed absolute configuration and a high enantiomeric excess are most likely.
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51
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0347801585
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The enantiomeric excess could not be determined.
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The enantiomeric excess could not be determined.
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