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ISSN 1998-9539

Synthesis and Extraction Properties of p-tert-Butylcalix[4]arenes with Crown-5 Ether Substituents

Elena A. Alekseeva,@ and Stepan S. Basok
A.V. Bogatsky Physico-Chemical Institute, National Academy of Sciences of Ukraine, 65080 Odessa, Ukraine
@Corresponding author E-mail: Alyeksyeyeva@rambler.ru
 
DOI: 10.6060/mhc170294a
Macroheterocycles2017 10(2) 221-225
 

A series of novel lower rim calix[4]arene receptors with crown ethers moieties, i.e. 24, 6, 8, each of which contains  15-crown-5 ether fragment, was synthesized. The complexation properties of obtained compounds were determined through the series of alkali, alkaline earth and some transition metal picrate extraction experiments. Calixarenes with two N-carbonylaza(or benzoaza)crown-5 ether units (2, 3) are efficient extractants for alkali metal ions whereas ligands with 4-amidobenzocrown-5 ether moieties show a binding ability toward some divalent cations. The tetrasubstituted calix[4]arene 6 is an effective but non selective extractant for studied metal picrates under experimental conditions with the ligand-cation ratio 1:1.

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