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Preparation of a Polyoxotungstate-Based Inorganic-Organic Hybrid Catalyst and the Application in Sulfide Oxidation and Azide-Alkyne Cycloaddition Reactions

Karimi Neyestani, Fatemeh | 2020

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 54672 (03)
  4. University: Sharif University of Technology
  5. Department: Chemistry
  6. Advisor(s): Bagherzadeh, Mojtaba
  7. Abstract:
  8. In this study polyoxotungstate-based inorganic-organic hybrid [C272H162N80Cu16.5W36O129Na9] .80.5H2O was synthesized in situ. This inorganic-organic hybrid resulted from the reaction between copper salt and sodium tungstate with the benzimidazole ligand. Combining inorganic-organic hybrid with polyoxotungstate improved the ability of this catalytic system in oxidation and cycloaddition reactions. The resulting product was identified by IR, X-ray diffraction (XRD), elemental analysis (CHNS), inductively coupled plasma (ICP-OES), field emission scanning electron microscope (FE-SEM) and EDX were technique. The catalyst was used in optimal conditions in sulfide oxidation and azide-alkyne cycloaddition reactions. The conditions were optimized for azide-alkyne cycloaddition and sulfide oxidation reactions by varying the amount of catalyst, solvent, temperature and time. This catalyst exhibited high catalytic activity in both reactions and produced 1,2,3-triazole derivatives with high yields, as well as selectively in the sulfide oxidation reaction. In both cycloaddition and sulfide oxidation reactions under optimum conditions it shows <99% efficiency, and under these conditions, sulfide oxidation only produced sulfoxide
  9. Keywords:
  10. Sulfide Oxidation ; Azide-Alkyne Cycloaddition ; Polyoxtungstate ; Catalysis ; Inorganic-Organic Hybrid Materials ; In-Situ Synthesis

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