Di-ionizable p-tert-butylcalix[4]arene-1,2-monothiacrown-3 ligands in the cone conformation: synthesis and metal ion extraction
作者:Dongmei Zhang、Jennifer D. Crawford、Richard A. Bartsch
DOI:10.1016/j.tet.2008.07.115
日期:2008.10
ionizable groups are oxyacetic acid and N-(X)sulfonyl oxyacetamide groups with X=methyl, phenyl, 4-nitrophenyl, and trifluoromethyl, which ‘tunes’ the acidity of the latter. The efficiency and selectivity of these novel ligands are assessed for competitivesolventextractions of alkali metal cations and of alkalineearth metal cations from aqueous solutions into chloroform. Also the efficiencies for single