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2O versus loss of stereochemical integrity with AcOD in deuterolysis of RZnI: ref. [9].
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0342743226
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For example, the lower limit for the inversion lifetime of the α-H in 2-butylzinc bromide is τ √2/2πΔν, >0.0075 s at 25 C/500 MHz
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For example, the lower limit for the inversion lifetime of the α-H in 2-butylzinc bromide is τ √2/2πΔν, >0.0075 s at 25 C/500 MHz.
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31
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0342308137
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Deconvolution and analytical integration of signals was performed throughout, both for superposed and nonsuperposed peaks. The ratios were compared for two sets of signals belonging to the same molecule (for example, Mc and α-H), the deviation being < 2% in all cases
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Deconvolution and analytical integration of signals was performed throughout, both for superposed and nonsuperposed peaks. The ratios were compared for two sets of signals belonging to the same molecule (for example, Mc and α-H), the deviation being < 2% in all cases.
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32
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0343177671
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In conditions of intermediate exchange (for example, Figure 2d) the spectra obtained at > 10 C showed broad signals for both diastereomers in a ratio only slightly smaller than that observed at 30 C
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In conditions of intermediate exchange (for example, Figure 2d) the spectra obtained at > 10 C showed broad signals for both diastereomers in a ratio only slightly smaller than that observed at 30 C.
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33
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0343613156
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The analyses were performed using HyperChem 5.1 pro from Hypercube Inc., 1998 and compared with the results obtained with CS MOPAC pro from Cambridge Soft Corporation, 1998. Essentially identical differences in conformational energies were found in all cases
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The analyses were performed using HyperChem 5.1 pro from Hypercube Inc., 1998 and compared with the results obtained with CS MOPAC pro from Cambridge Soft Corporation, 1998. Essentially identical differences in conformational energies were found in all cases.
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34
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0030583498
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D. A. Evans, M. C. Kozlowski, J. S. Tedrow, Tetrahedron Lett. 1996, 37, 7481-7484.
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Evans, D.A.1
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35
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0343177672
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[II]s. From these, the rotational and vibrational contributions can usually be neglected to a first approximation and the entropy of symmetry is equal to 0
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[II]s. From these, the rotational and vibrational contributions can usually be neglected to a first approximation and the entropy of symmetry is equal to 0.
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36
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0343177673
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For example, the 2-octylzinc bromide prepared from (R)-2-bromooctane in ref. [2b] has now been unambiguosly identified as racemic by using this method
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For example, the 2-octylzinc bromide prepared from (R)-2-bromooctane in ref. [2b] has now been unambiguosly identified as racemic by using this method.
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37
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0000358709
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L. Zhu, R. M. Wehmeyer, R. D. Rieke, J. Org. Chem. 1991, 56, 1445-1453.
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