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

Authors
Lang, J Dvorakova, H Bartosova, I Lhotak, P Stibor, I Hrabal, R
Citation
J. Lang et al., Conformational flexibility of a novel tetraethylether of thiacalix[4]arene. A comparison with the "classical" methylene-bridged compounds, TETRAHEDR L, 40(2), 1999, pp. 373-376
Citations number
15
Categorie Soggetti
Chemistry & Analysis","Organic Chemistry/Polymer Science
Journal title
TETRAHEDRON LETTERS
ISSN journal
00404039 → ACNP
Volume
40
Issue
2
Year of publication
1999
Pages
373 - 376
Database
ISI
SICI code
0040-4039(19990108)40:2<373:CFOANT>2.0.ZU;2-B
Abstract
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 temperat ure. Observed chemical exchange between conformers indicates higher interna l flexibility of the title compound in comparison with similar methylene br idged analogues of tetraethylethers of calix[4]arene and p-tert-butylcalix[ 4]arene. The cone conformer experiences additional internal motions. (C) 19 98 Elsevier Science Ltd. All rights reserved.