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- Type of Document: M.Sc. Thesis
- Language: Farsi
- Document No: 42263 (03)
- University: Sharif University of Technology
- Department: Chemistry
- Advisor(s): Bagherzadeh, Mojtaba
- Abstract:
- Inert gold become catalytically active when dispersed in the form of nanoparticles. Isolated gold nanoparticles have demonstrated high catalytic activity for both oxidation and reduction reactions. In order to obtain high catalytic activity, gold nanoparticles are generally dispersed on support materials, among which oxides are commonly used. However, a substantial decrease in activity and selectivity of the immobilized catalysts is frequently observed due to the heterogeneous nature of these support materials in reaction media. In the course of our study on the metal-based catalysis for synthesis of organic compounds, we herein report that rod-shaped Au nanoparticles in aqua solution efficiently catalyze dihydroxylation of alkenes to 1,2-diols with sodium periodate as oxidants and ring opening of epoxides to diols with isopropanol. In this study, different alkenes have been used as starting materials and the selectivity for all the diols products were over 99%, and also excellent turnover number was achieved. The use of water as a solvent makes the reaction interesting from both an economic and environmental point of view. Results confirm the new role of colloidal gold nanoparticle in catalytic oxidation reactions
- Keywords:
- Gold Nanoparticle ; Nano Catalyst ; Epoxide Ring Opening ; Dihydroxylation Alkanes ; 1,2-Diols
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محتواي پايان نامه
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- 1-2- نانو ذرات طلا
- 1-4-مکانیسم تولید نانو ذرات پایدار
- 1-5- روشهاي پايدار كردن نانو ذرات
- 1-6-اپوکسیدها
- 1-7- سنتز اپوكسيدها
- 1-8- واكنشهای اپوکسیدها
- 2-مروری بر مطالعات گذشته
- 3-بخش تجربی
- 4- نتیجهگیری و بحث
- 4-1-تهیه محلول نانوذرات کروی طلا
- 4-2- واكنشهاي كاتاليستي با نانو ذرات طلاي تهيه شده
- 4-3- مکانیسم پیشنهادی برای واکنش دیهیدروکسیلدار شدن آلکنها
- 4-4-بررسی قابلیت بازیابی نانو ذرات طلا در واکنش دیهیدروکسیلدار شدن آلکنها
- 4-5-بررسی فعالیت کاتالیزوری نانو ذرات طلا با اندازههای مختلف در واکنش دیهیدروکسیلدار شدن آلکنها
- 4-6-بررسی طیفهای UV-Vis نانو کاتالیزور قبل و بعد از انجام آزمایش
- 4-8-بررسی فعالیت کاتالیزوری نانو ذرات طلا با اندازههای مختلف در واکنش حلقهگشایی اپوکسیدها
- 4-9-نتیجهگیری
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- [73] Emmanuvel, L.; ShaikhT. M. A.; Sudalai, A., NaIO4/LiBr-mediated diastereoselective dihydroxylation of olefins:/ A catalytic approach to the Prevost−Woodward reaction,
- [74] Schmidbaur, H.; Schier,A., Gold η2-Coordination to unsaturated and aromatic hydrocarbons: The key step in gold-catalyzed organic transformations