SEARCH Articles Figures Tables Ammonium chiral Ammonium salts, chiral Asymmetric chirality Asymmetric epoxidation Asymmetric epoxidation catalyzed by novel azacrown ether-type chiral quaternary ammonium salts under phase-transfer catalytic conditions Chiral epoxidations Chiral epoxide Chiral epoxides Epoxidation chiral Epoxidations, asymmetric Epoxides asymmetric epoxidation Quaternary ammonium salts Quaternary salts Salts chiral