Abstract
Optically active 1-(1-naphthyl)ethylamine and 1-hydroxyalkylphosphonic acids form in nonpolar solvents diastereoisomeric salts distinguished in 31P NMR spectroscopy. The magnetic nonequivalence of phosphonate groups is large enough (esp. for benzyl monoesters salts Δδ31P is up to 0.36 ppm) to determine ee values. The dependence of diastereoisomeric salts magnetic nonequivalence on concentration and enantiopurity of amine component is studied.