Synthesis and extraction studies of 1,2- and 1,3-disubstituted butylcalix[4]arene amides with oxyions; geometric and conformational effects
Abstract
26,28-(Dibutylcarbamoyl)methoxy-5,11,17,23-tert-butylcalix[4]arene and two geometric isomers of 27,28-(dibutylcarbamoyl)methoxy-5,11,17,23-tert-butylcalix[4]arene have been used to extract UVI, MoVI, CrVI and SeVI from aqueous solution into toluene or isooctane.