Study On Novel Armed Crown Ether And Synthesis Of One Antioxidant

Crown ether is a kind of man-made receptor, and its study is still of ongoing interest for more than thirty years. It is a challengible task for researchers to design more highly selective crown ether for single metal ions. In the first part of this thesis, Five crown ethers were synthesized by using 2-methylbenzo[d]oxazole, pyrocatechol, 2-chloroethanol, aniline and triethylene glycol. They are 2,3,11,12-dibenzo-1,4,7,10, 13,16-hexaoxacyclooctadeca-2,11-diene, bis(4'-formyl)-2,3,11,12-dibenzo-1,4,7,10,13, 16-hexaoxacyclooctadeca-2,11-diene, bis{4'-[2-(2-benzooxazolyl)ethenyl]}-2,3,11,12 -dibenzo-1,4,7,10,13,16-hexaoxacyclooctadeca-2,11-diene, 7,16-diphenyl-1,4,10,13- tetraoxa-7,16-diaza-cyclooctadecane, N,N'-bis(4-formyl)-7,16-diphenyl-1,4,10,13- tetraoxa-7,16-diaza-cyclooctadecane. Bis{4'-[2-(2-benzooxazolyl)ethenyl]}-2,3,11,12 -dibenzo-1,4,7,10,13,16-hexaoxacyclooctadeca-2,11-diene is new. In order to improve the electronic spectra properties of the crown ether, efficient conjugatingπ-πgroup is connected with the benzene ring. The recognization ability with alkali metals and alkali earth metals was investigated via the spectra changing after the above metal cations are combined. It was expected that novel non-covalent forces in crystal such asπ-πstacking, cation-πinteractions and so on would aid the formation of supramolecular aggregation when those crown ethers coordinate with metal cations. These compounds were determined by melting point and 1H-NMR. Through fluorescence spectrum method, we primarily study on the linkage and selectivity of novel armed crown ethers-metal.In the second part, asymmetric diamide of homopiperazine was synthesized by using homopiperazine, 4-hydroxybenzoic acid and 6-hydroxynaph-thalene-2- carboxylic acid, this compound is new. Its structure was determined by 1H-NMR.