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Their Chiral Synthesis of Symmetric N2O2 Ligands and Zr(Ⅳ) Complexes

Author: ZhangLu
Tutor: WangMei
School: Dalian University of Technology
Course: Applied Chemistry
Keywords: Asymmetric N2O2 ligand The chiral metal zirconium complexes Spontaneously split crystallization Absolute asymmetric synthesis
CLC: O641.4
Type: Master's thesis
Year: 2007
Downloads: 65
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Abstract


Chiral metal complexes has been developing rapidly in the past 20 years have made a lot of success, both in basic research or development of chiral technology, it has become one of the most active research areas in organic chemistry . The main purpose of the chiral metal complexes as a catalyst in the catalytic reaction of the chiral applications, in recent years, the development and application of high activity of chiral catalysts has drawn increasing attention. Our group preliminary experimental results show that, with the design and synthesis of tert-butyl substituted asymmetric N 2 O 2 the ligand ZrCl 4 reaction chiral dual-core zirconium complexes. In order to further study the characteristics of the structure of such complexes, we have designed and synthesized in the six novel asymmetric N 2 O 2 ligands and corresponding zirconium complexes, and by testing means 1 H NMR, MS and elemental analysis were used to characterize the structure of the complexes and ligand. Through the study of the single crystal structure of the complex, we found that the tert-butyl substituted asymmetric N 2 O 2 ligand with ZrCl 4 reacts zirconium complexes for the oxygen bridge and hydroxyl bridges connect the dual-core zirconium complex was intermediate process involving mononuclear zirconium complex was a chlorine atom section hydrolysis and chlorine atom portion hydrolysis of the dual-core zirconium complex matter and all hydrolysis of the four-core zirconium complexes The crystal structure was found in the crystal growth process dual core zirconium complexes can be chiral split crystallized spontaneously. Further tert-butyl substituted asymmetric N of 2 O 2 coordination dual-core zirconium complexes crystal growth method, solvent, and temperature factors to optimize success shorten the time of crystal growth, and try to get a larger single crystal to the next step of the study. Tert-butyl substituted asymmetric N 2 O 2 with bit dual-core zirconium complexes monocrystalline circular dichroism spectra of the test, clearly two different spatial configuration type circular dichroism spectra of the enantiomers signal. And that the complex has a more reactive chlorine atom, the application is expected to be carried out in the the chiral catalytic reaction of the carbon metalation reaction. If you can successfully split, such zirconium complexes in asymmetric catalysis applications, such chiral zirconium complexes split method and its applications in asymmetric catalysis are worth continue in-depth research. By non-chiral compounds as a starting material through absolute asymmetric synthesis, to spontaneously split crystallization research and eventually as a catalyst applications chiral catalytic organic reactions, the exploration of the problem of the origin of the chiral important.

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CLC: > Mathematical sciences and chemical > Chemistry > Physical Chemistry ( theoretical chemistry ),chemical physics > Structural Chemistry > Complex chemistry ( coordination chemistry )
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