Thermal isomerisation of 25,26,27,28-tetrapropoxy-2,8,14,20-tetrathiacalix[4]arene: isolation of all four conformers
Thermal isomerisation of 25,26,27,28-tetrapropoxy-2,8,14,20-tetrathiacalix[4]arene: isolation of all four conformers
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25,26,27,28-四丙氧基-2,8,14,20-tetrathiaclix[4]芳烃的热异构化：所有四种构象异构体的分离
DOI：
10.1039/b007887p
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发表时间：
2001
期刊：
影响因子：
--
通讯作者：
I. Stibor
中科院分区：
文献类型：
--
作者：
J. Lang;J. Vlach;H. Dvořáková;P. Lhoták;M. Himl;R. Hrabal;I. Stibor
25，26，27，28-Tetrapropoxy-2，8，14，20-tetrathiacalix[4]arene在高温下经历热平衡，得到一种构象混合物。用核磁共振波谱确定了该过程的速率常数和平衡常数。首次在制备规模上使用平衡过程来分离和表征所有四种硫杂杯[4]芳烃的基本构象。
25,26,27,28-Tetrapropoxy-2,8,14,20-tetrathiacalix[4]arene undergoes a thermal equilibration at elevated temperature yielding a mixture of conformers. The rate and equilibrium constants of this process were established using NMR 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.