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Synthesis and Characterization of Mo(VI)–Schiff Base Complexes and Study its Catalytic Application in Homogenous and Hetrogenous Systems for Epoxidation of Olefins

Riyazifar, Mitra | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 45070 (03)
  4. University: Sharif University of Technology
  5. Department: Chemistry
  6. Advisor(s): Bagherzadeh, Mojtaba
  7. Abstract:
  8. In this project a novel molybdenum(VI) complex with tridentate Schiff base ligand which is soluble in water was synthesized and characterized. In the first step of complex synthesis, chloromethylation of salicylaldehyde was carried out and then, corresponding pyridine salt prepared in the second step. Ligand N-[(3-pyridinium chloride) salicylidene]-2-aminophenol was formed by reaction with aminophenol. In the presence of MoO2(acac)₂ the final product, cis-dioxo(N- (3-pyridinumchloride)salicylidene]-2-aminophenolato)ethanol olybdenum(VI) complex synthesized. The complex was characterized by CHN elemental analysis and spectroscopic methods UV, NMR and FT-IR.We used a high-yield (80-98%) and selective oxidation procedure for conversion of olefin to epoxides at 80 0C with using TBHP 70% in H2O as oxidant in 3 hours. The conversion is dependent on temperature and the nature of the solvent. Chlorinated solvents increase the reaction efficiency more than other solvents. 1,2-dichloro ethane is the most suitable solvent for this reaction. By this catalytic system, cyclic alkenes oxidized more easily than linear alkenes. The best result was observed for cyclooctene epoxidation is 99%. Also, heterogeneous catalyst which is supported on silica gel showed excellent reactivity and good reuseability in alkene epoxidation, without significant loss of activity and selectivity within successive runs
  9. Keywords:
  10. Silicagel ; Olefins Epoxidation ; Heterogeneous Catalysis ; Tertiary Butylhydroperoxide (TBHP) ; Molybdenum Schiffbase Complex

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