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Volumn 13, Issue 13, 2007, Pages 3772-3786

Analysis of intramolecular dynamic processes in enantiomeric diaryl atropisomers and related derivatives by2H NMR spectroscopy in polypeptide liquid crystals

Author keywords

Atropisomerism; Chirality; Conformational analysis; Exchange processes; Kinetic and activation parameters; Liquid crystals; NMR spectroscopy

Indexed keywords

DERIVATIVES; ISOMERS; LIQUID CRYSTALS; NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY; POLYPEPTIDES;

EID: 34250335976     PISSN: 09476539     EISSN: 15213765     Source Type: Journal    
DOI: 10.1002/chem.200601284     Document Type: Article
Times cited : (26)

References (66)
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    • Note that the case of chiral, substituted cyclohexanes is very peculiar because the exchange rate between enantiomers can be determined without discriminating the enantiomeric forms. Indeed for these compounds, the interconversion between enantiomers also leads to the interconversion of diastereotopic directions (axial and equatorial bonds) that are nonequivalent in achiral LCs
    • Note that the case of chiral, substituted cyclohexanes is very peculiar because the exchange rate between enantiomers can be determined without discriminating the enantiomeric forms. Indeed for these compounds, the interconversion between enantiomers also leads to the interconversion of diastereotopic directions (axial and equatorial bonds) that are nonequivalent in achiral LCs.
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    • This approach is called the coalescence temperature method
    • This approach is called the "coalescence temperature method".
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    • c. and then determine the intersection point of the two plots.
    • c. and then determine the intersection point of the two plots.
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    • This implies that the coalescence phenomenon cannot be reached at 350 K and hence the data derived from the MMCs are consistent with the NMR results. At 350 K, the value of ΔG≠ determined from Equation (4, ΔG≠, 84.7 kJmol-1) is too high compared with the value calculated with Equation 6, ΔG≠, 70.9 kJmol-1
    • -1).
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* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.