Protolytic properties and reactivity of aminomethylated calix[4]resorcarenes in reactions with esters of phosphorus acids

The acid-base properties and the kinetics of reactions of aminomethylated c alix[4]resorcarenes (AMC) with p-nitrophenyl eaters of phosphorus acids in aqueous solutions of propan-2-ol (80 vol.% (PrOH)-O-i) were studied by pote ntiometry, UV spectrophotometry, and P-31 NMR spectroscopy. The effect of t he length of the hydrocarbon radical and substituents at the nitrogen atom on the protolytic properties and reactivity of AMC was studied. The reactio ns studied occur in two stages. At the first stage, phosphorylated AMC are formed, which are hydrolyzed to the corresponding acids at the second stage .