Conformational flexibility of a novel tetraethylether of thiacalix[4]arene.: A comparison with the "classical" methylene-bridged compounds

被引：59

作者：

Lang, J

Dvoráková, H

Bartosová, I

Lhoták, P

Stibor, I

Hrabal, R

机构：

[1] Inst Chem Technol, Lab NMR Spect, CR-16628 Prague 6, Czech Republic

[2] Inst Chem Technol, Dept Organ Chem, CR-16628 Prague 6, Czech Republic

来源：

TETRAHEDRON LETTERS | 1999年 / 40卷 / 02期

关键词：

calixarenes; sulfur compounds; NMR; conformation;

D O I：

10.1016/S0040-4039(98)02315-6

中图分类号：

O62 [有机化学];

学科分类号：

070303 ; 081704 ;

摘要：

Conformational analysis of a novel tetraethylether of thiacalix[4]arene by means of NMR spectroscopy is presented. Equilibrium between three dominant conformers pace, 1,3-alt and cone exists in CDCl3 solution at room temperature. Observed chemical exchange between conformers indicates higher internal flexibility of the title compound in comparison with similar methylene bridged analogues of tetraethylethers of calix[4]arene and p-tert-butylcalix[4]arene. The cone conformer experiences additional internal motions. (C) 1998 Elsevier Science Ltd. All rights reserved.

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收藏

页码：373 / 376

页数：4

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