Synthesis and binding properties of calix[4]arene telomers

Two calix[4]arene derivatives (5 and 8) and their telomers are synthesized to estimate selective extraction of alkali and transition metal cations fro m the aqueous to the organic phase (chloroform). Compound 5 shows selectivi ty toward Hg2+. Compound 8 and telomers 6 and 9 are not selective but are g ood extractants for all used transition metal ions. The observations sugges t that ethylene glycol bridges are efficient for carrying transition metal cations in a two-phase solvent system. (C) 1999 John Wiley & Sons, Inc.