The synthesis of bifunctional derivatives of calix[4]arene and its thia-analogue containing double and triple bonds in 1,3-alternate and partial cone conformations was performed. The effect of tert-butyl groups at the upper ...

Tetrasubstituted on the lower rim calix[4]arenes, containing carbonyl and ester groups, and existing in a cone conformation are selective and efficient extracting agents for TcVII extraction from both acidic and basic solutions.