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Silsesquioxane-based homogeneous and heterogeneous epoxidation catalysts developed by using high-speed
Paolo P Pescarmona1, Jan C van der Waal, Thomas Maschmeyer
1Laboratory of Applied Organic Chemistry and Catalysis, DelftChemTech, Technische Universiteit Delft, Julianalaan 136, 2628 BL Delft, The Netherlands.
Chemistry (Weinheim an Der Bergstrasse, Germany)
|April 1, 2004
Summary
New titanium-silsesquioxane catalysts for epoxidation were developed using novel synthesis methods. These catalysts, derived from a unique silsesquioxane precursor, show promise for efficient chemical transformations.
Area of Science:
- Materials Science
- Catalysis
- Organosilicon Chemistry
Background:
- Silsesquioxanes are versatile silicon-oxygen cage compounds.
- Developing efficient epoxidation catalysts is crucial for chemical synthesis.
- Titanium-based catalysts are widely used in oxidation reactions.
Purpose of the Study:
- To discover novel titanium-silsesquioxane epoxidation catalysts.
- To explore the synthesis of silsesquioxanes via hydrolytic condensation.
- To prepare and characterize new heterogeneous epoxidation catalysts.
Main Methods:
- High-speed experimentation techniques for catalyst screening.
- Hydrolytic condensation of trichlorosilanes in polar solvents.
- Preparation and characterization of titanium-silsesquioxane complexes and supported catalysts.
Main Results:
- Discovery of new titanium-silsesquioxane epoxidation catalysts.
- Identification of a specific silsesquioxane structure, tBu(2)Si(2)O(OH)(4), as a key precursor.
- Successful preparation of active heterogeneous epoxidation catalysts by supporting Ti complexes on silica.
Conclusions:
- The novel silsesquioxane tBu(2)Si(2)O(OH)(4) is a valuable precursor for active titanium epoxidation catalysts.
- Heterogeneous catalysts derived from this precursor demonstrate significant potential for epoxidation reactions.
- This work expands the application of silsesquioxanes in catalysis.