N-Benzylquininium chloride (or Quibec) belongs to the class of cinchona family of alkaloids. It is used as a catalyst in the presence of hydroxide bases in various phase transfer reactions, epoxidations, alkylations, and Michael reactions. Application： N-Benzylquininium chloride can be used as a phase transfer catalyst: In the sulfenylation of various β-keto sulfoxides. To synthesize N-carbamoyl-protected β-nitroamines from α-amido sulfones by asymmetric aza-Henry reaction.