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In the absence of 4 Å molecular sieves, the enantioselectivity was irreproducible from 48 to 88%ee, This problem was circumvented by the addition of 4 Å molecular sieves, which scavenges adventitious acid that could contaminate the glyoxylate. For 4 Å molecular sieves as an acid scavenger, see: M. Terada, T. Ikehara, H. Ube, J. Am. Chem. Soc. 2007, 129, 14112-14113, and references therein
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In the absence of 4 Å molecular sieves, the enantioselectivity was irreproducible (from 48 to 88%ee). This problem was circumvented by the addition of 4 Å molecular sieves, which scavenges adventitious acid that could contaminate the glyoxylate. For 4 Å molecular sieves as an acid scavenger, see: M. Terada, T. Ikehara, H. Ube, J. Am. Chem. Soc. 2007, 129, 14112-14113, and references therein.
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80
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0034714254
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P. Herold, A. F. Indolese, M. Studer, H. P. Jalett, U. Siegrist, H. U. Blaser, Tetrahedron 2000, 56, 6497-6499.
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(2000)
Tetrahedron
, vol.56
, pp. 6497-6499
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Herold, P.1
Indolese, A.F.2
Studer, M.3
Jalett, H.P.4
Siegrist, U.5
Blaser, H.U.6
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81
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53549087062
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See the Supporting Information for the details of the DFT computational analysis
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See the Supporting Information for the details of the DFT computational analysis.
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82
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37049091868
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For X-ray crystallographic analysis of a two-hydrogen-bonding interaction between carboxylic acid and dimethylformamide, see: a M. Czugler, J. J. Stezowski, E. Weber, J. Chem. Soc. Chem. Commun. 1983, 154-155;
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For X-ray crystallographic analysis of a two-hydrogen-bonding interaction between carboxylic acid and dimethylformamide, see: a) M. Czugler, J. J. Stezowski, E. Weber, J. Chem. Soc. Chem. Commun. 1983, 154-155;
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83
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37049074566
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b) I. Csöregh, A. Sjögren, M. Czugler, M. Cserzö, E. Weber, J. Chem. Soc. Perkin Trans. 2 1986, 507-513.
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(1986)
J. Chem. Soc. Perkin Trans. 2
, pp. 507-513
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Csöregh, I.1
Sjögren, A.2
Czugler, M.3
Cserzö, M.4
Weber, E.5
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