SEARCH Articles Figures Tables Asymmetric Cycloaddition Catalyzed by Cinchona-Based Phase-Transfer Catalysts Asymmetric cinchona-based phase-transfer Aziridination of Enones Using Cinchona-Based Chiral Phase-Transfer Catalyst Cinchona Cinchona bases Cinchona-based phase-transfer catalysts Phase transfer catalysis cinchona-based catalysts