Novel chiral monoaza-15-crown-5 ether derivatives 1 and 2 were prepared from l-phenylalaninol and l-leucinol, respectively. The effect of the substituent at the stereogenic center on chiralrecognition and enantioselectivity were investigated. Binding constant (K), free-energy changes (−ΔG0), enthalpy change (ΔH), and entropy change (ΔS) values were determined with enantiomers of organicammonium salts
A chiral monoaza-15-crown-5 ether derivative was prepared from l-Leucinol and used as a chiral stationary phase. The new chiral stationary phases CSP-1 and CSP-2 were employed in separating the enantiomers of the sodium and potassium salts of amino acids. The sodium and potassium salt of the d-enantiomers of all amino acids (PhyAlaNa, PhyAlaK and PhyGlyNa, PhyGlyK, and TrpNa, TrpK) show higher selectivity