Is. Ryzhkina et al., THE REACTIVITY OF CALIX[4]RESORCINOLARENE ANIONS TOWARDS P-NITROPHENYL ESTERS OF TETRACOORDINATED PHOSPHORUS-ACIDS, Mendeleev communications, (3), 1997, pp. 88-90
The results of a kinetic study have shown that the reactivity of monom
eric forms of amphiphilic tetra-([H4L](4-)) and octa-([L](8-)) anions
of calix[4]resorcinolarenes (H8L) towards p-nitrophenyl esters of tetr
acoordinated phosphorus acids in aqueous dimethylformamide (50 vol.% o
f DMF) is determined by the nucleophilic centres of the anions, wherea
s an increase in the concentration of H8L inhibits the process, which
is due to the formation of aggregates.