Calixarene-based anionic receptors

Abstract

The review summarizes and analyzes recent (2004)(2005)(2006)(2007)(2008) published data on anionic receptors based on calixarenes.

Promising advances of thiacalix[4]arene in crystal structures

“…Thiacalix [4]arenes, new members of the calixarene family, 1,2 have now become one kind of robust scaffolds and have attracted considerable attention in supramolecular chemistry and materials science. [3][4][5][6][7][8][9][10][11][12][13][14] Compared with calix [4]arene, the four S bridges replacing the CH 2 linkers endow many novel features such as larger cavity, better exibility, richer conformational behavior, and the possibility of multiple chemical modications. 5 Moreover, the introduction of S atoms makes thiacalix [4]arenes possess the additional affinity for binding desired substrates in their supramolecular systems.…”

Synthesis and transformations of perfluoroalkyl-containing 6,7-dihydro-1H-indazol-4(5H)-ones oximes

“…It is known that trifluoromethyl group bound to a pyrazole ring hydrolyzes in alkali conditions with the generation of pyrazolecarboxylic acids [30], whereas the trifluoromethyl group attached to aromatic ring is hydrolyzed by strong acids (100% H 2 SO 4 , 20-30% oleum) by electrophilic attack on fluorine atom with the formation of benzoic acid [31,32]. In our reaction conditions, the hydrolysis of pyrazole trifluoromethyl group of indazole scaffold resulted in generation of a carboxy group.…”

Modified Calix[4]crowns as Molecular Receptors for Barium

“…[14,15] Other applications involvec alixarenes as extractinga gents for (radio)metal ions [16,17] in the environmenta nd as chemicals ensors [18,19] for the determination of cations [20] and anions. [21] In this regard, a large variety of special functionalized calixarenes was prepared.…”