K. Gloe et al., PREORGANIZED ENDO-DICARBOXYLIC HOST MACROCYCLES HAVING SUPERIOR EXTRACTION SELECTIVITY FOR SMALL ALKALINE-EARTH METAL-IONS, Journal of the Chemical Society, Chemical Communications, (17), 1994, pp. 1955-1956
Novel preorganized host macrocycles with defined cavity size and two c
onvergent carboxylic acid groups extract small alkaline earth metal io
ns in a liquid two-phase system with high selectivity, in particular C
a2+, unlike the alkali metal ions.