Enhanced thermodynamic and kinetic stability of calix[4]arene dimers locked in the cone conformation |
| |
Authors: | Vysotsky Myroslav O Mogck Oliver Rudzevich Yuliya Shivanyuk Alexander Böhmer Volker Brody Marcus S Cho Young Lag Rudkevich Dmitry M Rebek Julius |
| |
Affiliation: | Abteilung Lehramt Chemie, Fachbereich Chemie und Pharmazie, Johannes Gutenberg-Universit?t Mainz, Duesbergweg 10-14, D-55099, Mainz, Germany. |
| |
Abstract: | Wide rim tetraurea derivatives (2a,b) have been prepared from a calix[4]arene rigidified in the cone conformation by two diethyleneglycol ether bridges between adjacent oxygens. In comparison to the analogous tetraurea derivatives (3a,b) of a tetrapentoxy calix[4]arene, 2a,b show an increased thermodynamic stability in mixtures of CDCl(3) and DMSO-d(6). Their kinetic stability as expressed by the rate of guest exchange (benzene or cyclohexane against the solvent benzene-d(6)) is also strongly increased by factors of 30-38. Noticeable differences for the inclusion of selected guests are found. |
| |
Keywords: | |
本文献已被 PubMed 等数据库收录! |
|