Synthesis of novel calixcrown derivatives with selective complexation towards cesium ions
摘要:
A series of novel calix[4]arenecrown-6 derivatives with an alkenyl loop of various sizes 5-8 were synthesized via intramolecular ring closing olefin metathesis and characterized by H-1 NMR, C-13 NMR and ESI-HRMS. Their complexation property towards cesium ion was studied by H-1 NMR technique. Two-phase extraction of alkali metal ions using UV-vis spectroscopy revealed remarkably different extractabilities. These results indicate that the complexation capacities towards cesium ions can be tuned and controlled through cooperative regulation of the strain of the loop and conformational change of calixcrown skelton. (C) 2010 Wen Feng. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.
Conformational control in the synthesis of mixed tetraethers of calix[4]arene. Part 2
作者:Miguel Pitarch、Julie K. Browne、M.Anthony McKervey
DOI:10.1016/s0040-4020(97)10078-3
日期:1997.11
A series of mixed tetraethers of calix[4]arene and p-tert-butylcalix[4]arene in which two distal substituents are methyl and the other two 1-alkenyl groups with 3, 4 and 5 carbon atom chains have been prepared by two routes which differ in the order in which the groups (methyl or alkenyl) were introduced. The ethers of p-tert-butylcalix[4]arene were isolated as a mixture of cone (minor) and partial
通过两个制备了一系列杯[4]亚芳基和对叔丁基杯[4]亚芳基的混合四醚,其中两个末端取代基是甲基,另外两个具有3、4和5个碳原子链的1-烯基在引入基团(甲基或烯基)的顺序上不同的途径。对-叔丁基杯[4]芳烃的醚在动态平衡状态下以圆锥(次要)和部分圆锥(主要)构象的混合物形式分离出来。对于杯[4]芳烃的醚,其构象结果取决于合成方法。最多可以检测到三个构象:一个圆锥体,一个带有茴香基单元的部分圆锥体以及一个带有烯基轴承环的部分圆锥体。1个对这些醚与碱金属碘化物之间形成的络合物的1 H NMR分析表明,碘化锂可检测到对叔丁基杯[4]芳烃四醚的圆锥和部分圆锥络合物,但只有杯形的圆锥络合物[4]。 ]芳烃衍生物。两组化合物也都形成了碘化钠配合物,但在所有情况下都只检测到了锥体配合物。