Study Of Bifunction Catalytic System Of Hypervalent-iodine-transition Metal Complex

This dessertation is consisted of following two parts:1. Synthesizing tetradentate ligand of iodine benzene and its transition metal(Mn2+, Co2+, Cu2+) complexes and researching catalytic properties of ethylbenzeneTwo N-containing tetradentate ligands, L1(C30H32I2N4O2) and L2(C30H32N4O2)and their metal complexs [CuL1CH3CN](ClO4)2(4),[CoL1(CH3CN)2](ClO4)2(5),[MnL1Cl2](6),[MnL2Cl2](7) were synthesized. All the compounds werecharacterized by IR, UV-Vis, mass spectrometry and elemental analysis. The crystalstructures of complexs4-7were determined by X-ray single crystal diffraction. Thesecompounds were used as catalysts to catalyse the oxidation of ethylbenzene withoxone as oxidant. Our results show that complexe6exhibited the best catalyticefficacy with a yield of87%among complexes4-6. Compound7possesses no iodinebenzene and it catalytic activity is much lower with a yield of16%.2. Aerobic oxidation of benzyl bromide into benzyl aldehyde.Designing and synthesizing of seven benzyl bromide complexs to explor benzylaldehyde with oxygen of air as oxidant. Our results show that under the conditions oftungsten light and bases, some benzyl bromide can be oxided to benzyl aldehyde withoxygen of air at room temperature. This oxidation reaction is a radical mechanismreaction, which was generated by benzyl bromide under the condition of light.Theoretical calculations indicate that benzyl radicals and aromatic substituents canform π-π stracking which may conducive to the stability of free radicals which couldpromot the formation of bromide aldehyde by benzyl bromide of oxygen of air.However, benzyl bromide without π-π stracking had no effect of this reaction.