Synthesis of 1,3-(distal) Diamide Substituted Calix[4]arene Based Receptors for Extraction of Chromium (VI)

Abstract

The synthesis of novel diamide derivatives of calix[4]arene by aminolysis of calix[4]arene diesters was reported. The ¹H and ¹³C NMR, data showed that the synthesized compounds exist in the cone conformation. The complexation properties of these calix[4]arenes have been studied towards anions and it has been found that the protonated alkyl ammonium forms of calix[4]arene diamide derivatives (5,11,17,23-tetra-tert-butyl-25,27-(diethylpiperidineacetamido)26,28-dihydroxy-calix[4]arene 3 and 25,27-(diethyl-piperidineacetamido)26,28-dihydroxycalix[4]arene 4) are effective extractants for transferring anions.

Keywords:

• Calix[4]arene
• Diamide
• Dichromate anions
• Solvent extraction

Acknowledgements

We thank the Research Foundation of Selçuk University, Konya-Turkey (BAP 06101019) for financial support of this work.