Thermal isomerisation of 25,26,27,28-tetrapropoxy-2,8,14,20-tetrathiacalix[4]arene: isolation of all four conformers

Authors
Lang, J Vlach, J Dvorakova, H Lhotak, P Himl, M Hrabal, R Stibor, I
Citation
J. Lang et al., Thermal isomerisation of 25,26,27,28-tetrapropoxy-2,8,14,20-tetrathiacalix[4]arene: isolation of all four conformers, J CHEM S P2, (4), 2001, pp. 576-580
Citations number
21
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
JOURNAL OF THE CHEMICAL SOCIETY-PERKIN TRANSACTIONS 2
ISSN journal
1472779X → ACNP
Issue
4
Year of publication
2001
Pages
576 - 580
Database
ISI
SICI code
1472-779X(200104):4<576:TIO2>2.0.ZU;2-7
Abstract
25,26,27,28-Tetrapropoxy-2,8,14,20-tetrathiacalix[4]arene undergoes a therm al equilibration at elevated temperature yielding a mixture of conformers. The rate and equilibrium constants of this process were established using N MR spectroscopy. For the first time the equilibrating process was also used on a preparative scale for the isolation and characterisation of all four basic thiacalix[4]arene conformations.