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Volumn 63, Issue 21, 1998, Pages 7481-7489

Novel self-assembly of m-xylylene type dithioureas by head-to-tail hydrogen bonding

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EID: 0001317713     PISSN: 00223263     EISSN: None     Source Type: Journal    
DOI: 10.1021/jo980441p     Document Type: Article
Times cited : (33)

References (46)
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    • 2
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    • note
    • 2 protons of the butyl chain shifted upfield from δ 3.13 to 2.86. However, the signal downfield shifted to δ 2.89 when the concentration increased up to 21 mM. Such concentration dependence precluded the calculation of the association constants on the assumption that monomer-dimer equilibrium is dominant in this concentration range.
  • 29
    • 33744880169 scopus 로고    scopus 로고
    • For the anisotropic deshielding effect of carbonyl group, see ref 12, p 88. Such large chemical shift difference of vicinal protons adjacent to an amide nitrogen is also seen in the spectra of cyclic compounds
    • For the anisotropic deshielding effect of carbonyl group, see ref 12, p 88. Such large chemical shift difference of vicinal protons adjacent to an amide nitrogen is also seen in the spectra of cyclic compounds:
  • 34
    • 85023296576 scopus 로고
    • For calculation of the ΔG‡ value, we did not take into account the participation of monomer la in the equilibrium between 24 and 24′, because even at 90 °C the monomer-dimer equilibrium shifted almost exclusively to the dimer at this concentration. The apparent upfield shift of the chemical shift of the NH protons with increasing temperatures is ascribed to the distortion of the hydrogen bond rather than dissociation of 24. See, for the temperature effects on the chemical shift of hydrogen-bonded protons: Adrian, J. C., Jr.; Wilcox, C. S. J. Am. Chem. Soc. 1991, 113, 678-680.
    • (1991) J. Am. Chem. Soc. , vol.113 , pp. 678-680
    • Adrian Jr., J.C.1    Wilcox, C.S.2
  • 39
    • 1542502565 scopus 로고    scopus 로고
    • Nonlinear alignment of urea groups in the solid state was found in the structure of hydrogen-bonded dimer of a calix[4]arene derivative. However, it seems likely that the exceptional hydrogen bonding pattern is due to the restricted geometry of urea functions anchored to the rigid calixarene backbone: Mogck, O.; Paulus, E. F.; Böhmer, V.; Thondorf, L; Vogt, W. Chem. Commun. 1996, 2533-2534.
    • (1996) Chem. Commun. , pp. 2533-2534
    • Mogck, O.1    Paulus, E.F.2    Böhmer, V.3    Thondorf, L.4    Vogt, W.5
  • 42
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    • Excel version 5.0; Microsoft Corp., Tokyo
    • Excel version 5.0; Microsoft Corp., Tokyo.
  • 43
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    • Wave Metrics, Inc., Lake Oswego, NY
    • Wave Metrics, Inc., Lake Oswego, NY.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.