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Heterogenization of Ionic Complexes of Mo(VI) with Sulfonated Schiff Base Ligands on the Polysiloxane as Support for Catalytic Epoxidation of Olefins

Mohammadabadi, Hadiseh | 2014

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 46480 (03)
  4. University: Sharif University of Technology
  5. Department: Chemistry Science
  6. Advisor(s): Bagherzadeh, Mojtaba
  7. Abstract:
  8. In this project a new molybdenum (VI) complex with tetradentate Schiff base ligand which was soluble in water was synthesized and characterized. In the first step of ligand synthesis, the reaction was performed between salicylaldehyde and aniline, and then used concentrated sulfuric acid for sulfonation. In the next step 5- sulfosalicylaldehyde sodium salt was formed by removing of aniline with heating and using sodium carbonate. In the presence of ethylendiamine and bis (acetylacetonato) dioxomolybdenum(VI) the final product, cis-dioxo sodium (N,N-bis (5-sulfonatosalicyldene)1,2-diaminoethane) molybdenum (VI) complex was synthesized. The complex was characterized by (CHN) elemental analysis and spectroscopic methods UV, NMR and FT-IR. The complex has been used as catalyst in selective oxidation of olefins to corresponding epoxides at 110 oC using TBHP as oxidant in 1h (80-100%). The reaction was carried out in various polar and nonpolar solvents. Based on conversion toluene was selected as optimized solvent for the catalytic system. The present catalytic system can efficiency oxidized both linear and cyclic olefins to epoxides. The best result in the epoxidation of olefins was observed for cyclooctene epoxidation (conversion >99%). Also, heterogenized catalyst which was supported on poly(3-aminopropyl)siloxane hydrochloride showed excellent reactivity and good reuseability in alkene epoxidation, without significant loss of activity and selectivity within successive runs
  9. Keywords:
  10. Catalytic Epoxidation ; Heterogeneous Catalysis ; Tertiary Butylhydroperoxide (TBHP) ; Molybdenum Schiffbase Complex ; Olefins Epoxidation

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