SEARCH Articles Figures Tables Asymmetric epoxidation catalyzed by novel azacrown ether-type chiral quaternary ammonium salts under phase-transfer catalytic conditions Azacrown Azacrown Ligating Units Azacrown compounds Azacrown core Azacrown decorated calixarenes Azacrown ether Azacrown ether derivatives Azacrown ether-type quaternary ammonium Azacrown ethers and porphyrinogens Azacrown ethers, conformers Azacrown ethers, synthesis Azacrown sensors Azacrowns proton binding Azacrowns pyridine Azacrowns synthesis Azacrowns with sidearms Biologically active azacrowns Calix azacrowns Chiral azacrown ether Py-azacrown Syntheses of Azacrowns Synthesis of the azacrown ether Synthesis of the azacrown ether-type quaternary ammonium salt