Mono-ionizable calix[4]arene-benzocrown-6 ligands in 1,3-alternate conformations: synthesis, structure and silver(I) extraction
作者:Malgorzata Surowiec、Radu Custelcean、Kazmiriez Surowiec、Richard A. Bartsch
DOI:10.1016/j.tet.2009.07.006
日期:2009.9
proton-ionizable group (PIG) is attached to the para position of one aromatic ring in the calixarene framework, thereby positioning it over the polyether ring cavity. In the other series, the PIG is a substituent on the benzo group in the polyether ring. This orients the PIG away from the crown ether cavity. In addition to carboxylic acid functions, the PIGs include N-(X)sulfonyl carboxamide groups. With X group
合成了两个系列的1,3-交替构象的新型可单电离的杯[4]芳烃-苯并冠-6配体。在一个系列中,质子可电离基团(PIG)连接到杯芳烃骨架中一个芳香环的对位,从而将其定位在聚醚环腔上。在另一系列中,PIG是聚醚环中苯并基上的取代基。这会使PIG远离冠醚腔。除了羧酸官能团之外,PIG还包括N-(X)磺酰基羧酰胺基团。当X基团从甲基到苯基,从4-硝基苯基到三氟甲基变化时,PIG的酸度被“调节”。Ag +的溶剂萃取 从水溶液到氯仿的溶液用于研究单电离杯顶配体内部结构变化对金属离子萃取效率的影响,包括PIG的身份和酸度以及其相对于聚醚环的取向。