SEARCH Articles Figures Tables Ammonium chiral Ammonium salts, chiral structures Asymmetric epoxidation catalyzed by novel azacrown ether-type chiral quaternary ammonium salts under phase-transfer catalytic conditions Asymmetric epoxidation chiral quaternary ammonium salts Catalysts chiral ammonium salt phase Chiral Quaternary Ammonium Salts as Catalysts for the Strecker Reaction Chiral ammonium salts, catalysis Chiral quaternary ammonium cinchonidine salts Chiral quaternary ammonium salt Salts chiral Salts chiral quaternary ammonium bromide