Lh. Delmau et al., CMPO-SUBSTITUTED CALIX[4]ARENES, EXTRACTANTS WITH SELECTIVITY AMONG TRIVALENT LANTHANIDES AND BETWEEN TRIVALENT ACTINIDES AND LANTHANIDES, Chemical communications, (16), 1998, pp. 1627-1628
Calix[4]arenes substituted by acetamidophosphine oxide groups at their
wider (upper) rim not only exhibit excellent extraction efficiency to
wards trivalent cations but also show pronounced selectivity for the l
ight lanthanides and actinides in their extraction from highly saline
or acidic media.