SYNTHESES OF PHOSPHATE DIESTERS HAVING P-TERT-BUTYLCALIX[4]ARENE AND ALKYL GROUP AS ESTER MOIETIES, AND THEIR SELECTIVE LITHIUM CATION-TRANSPORT ABILITIES THROUGH LIQUID MEMBRANES
S. Akabori et al., SYNTHESES OF PHOSPHATE DIESTERS HAVING P-TERT-BUTYLCALIX[4]ARENE AND ALKYL GROUP AS ESTER MOIETIES, AND THEIR SELECTIVE LITHIUM CATION-TRANSPORT ABILITIES THROUGH LIQUID MEMBRANES, Chemical communications, (22), 1997, pp. 2137-2138
Phospate diesters, 2a, 2b and 2c, having p-tert-butyicalix-[4]arenes a
nd alkyl-groups as ester moieties exist as an equilibrium of cone and
partial-cone conformations in solution and selectively transport Li+;
however, the conformations of the calix[4]arene moieties in the Li and
Na complexes of 2a as the methyl ester and/or 2b as the ethyl ester i
n solution are cone only, although that of the K complex exists as a m
ixture of cone and partial-cone conformers.