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Volumn 3, Issue 19, 2005, Pages 3508-3513

Conformational properties of cyanomethoxy calix[4]arenes

Author keywords

[No Author keywords available]

Indexed keywords

ACTIVATION ENERGY; ALKYLATION; COMPLEXATION; CONFORMATIONS; ETHERS; ISOMERIZATION; MIXTURES; NITRATION; NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY; ORGANIC SOLVENTS; REACTION KINETICS; SINGLE CRYSTALS; THERMODYNAMICS;

EID: 27144549295     PISSN: 14770520     EISSN: None     Source Type: Journal    
DOI: 10.1039/b507780j     Document Type: Article
Times cited : (8)

References (22)
  • 10
    • 0037430421 scopus 로고    scopus 로고
    • O-Alkylation by hydroxyethyl phthalimide under Mitsunobu conditions has been recently used as an alternative: I. Bitter and V. Csokai, Tetrahedron Lett., 2003, 44, 2261-2265.
    • (2003) Tetrahedron Lett. , vol.44 , pp. 2261-2265
    • Bitter, I.1    Csokai, V.2
  • 15
    • 27144450554 scopus 로고    scopus 로고
    • note
    • A closer look to the chemical shifts for various protons reveals rather strong changes (0.1 ppm or more) with increasing temperature. This may be understood by the assumption that the conformational equilibrium (eqn 1), which is slow on the NMR time-scale is superimposed by a kinetically rapid equilibrium (or equilibria) of one (or both) conformers. Such a rapid equilibrium, e.g. the formation of larger molecular staples, would lead just to an averaged signal for a given proton. Although this interpretation is supported by the observation that dilution of the solution leads to similar chemical shift changes like an increase of the temperature, it remains just an interpretation.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.