Synthesis of new type chiral quaternary ammonium salt-porphyrin compounds;

This article reviews the recent advances in the application of chiral quaternary ammonium salts as phase-transfer catalysts in asymmetric catalytic reactions, including the alkylation of active methylene group, the Michael addition reaction, the epoxidation of chalcones, the Darzens condensation, the synthesis of azacyclopropanes, the aldol condensation and the Horner-Wadsworth-Emmons reaction.

Chiral quaternary ammonium salts and chiral crown ethers were introduced as phase transfer catalysts, their applications in asymmetric addition, substitution, oxidation and reduction were also presented with 97 references.

A substituted reaction in the synthesis of N-chiral quaternary ammonium salts based on linear amino acid;

The effects of n-propanol, n-butanol, n-pentanol and n-hexanol on the micellization of quaternary-ammonium dimeric surfactant C 12-2-C 12·2Br have been investigated using conductivity and steady fluorescence measurements.