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Volumn 39, Issue 8, 2000, Pages 1475-1479

Study of the configuration stability of the carbon - zinc bond, direct measurement of enantiomeric ratios, and tentative assignment of the absolute configuration in secondary organozinc halides

Author keywords

Configuration determination; N ligands; NMR spectroscopy; Semi empirical calculations; Zinc

Indexed keywords

ORGANOHALOGEN DERIVATIVE; ZINC DERIVATIVE;

EID: 0034678588     PISSN: 14337851     EISSN: None     Source Type: Journal    
DOI: 10.1002/(SICI)1521-3773(20000417)39:8<1475::AID-ANIE1475>3.0.CO;2-S     Document Type: Article
Times cited : (21)

References (37)
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    • c) see also ref. [10b].
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    • 2O versus loss of stereochemical integrity with AcOD in deuterolysis of RZnI: ref. [9].
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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
    • 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.
  • 31
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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
    • 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.
  • 32
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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
    • 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.
  • 33
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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
    • 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.
  • 35
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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
    • [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.
  • 36
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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
    • 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.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.