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    Synthesis of novel chiral monoaza-15-crown-5 ethers and their molecular recognition of amino acid esters
    (Science Reviews 2000 Ltd, 2004) Turgut, Y; Isgin, ES; Hosgören, H
    The chiral monoaza-15-crown-5 ethers 4 and 5 were prepared from L-phenylalaninol and L-leucinol, respectively. The molecular recognition of these chiral crown ethers for L-amino acid ethyl esters was characterised by UV-visible spectroscopy. Binding constants (K-a), free-energy changes (-DeltaGdegrees), enthalpy changes (DeltaH) and entropy change (DeltaS) values were determined for hosts 4 and 5 with L-amino acid ethyl ester hydrochlorides in CHCl3.