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Published on: October 18, 2019
Base Metal-terpyridine Complex Immobilized on Stationary Phase Aimed as Reusable Hydrosilylation Catalyst
Katsuaki Kobayashi1, Hiroshi Nakazawa1
1Department of Chemistry, Graduate School of Science, Osaka City University Sumiyoshi-ku, Osaka, 558-8585, Japan.
This study explored base metal-terpyridine complexes for hydrosilylation catalysis. Cobalt complexes immobilized on silica gel showed high activity and reusability, especially when functionalized on glassware surfaces.
Area of Science:
- Catalysis
- Materials Science
- Organic Chemistry
Background:
- Terpyridine complexes of base metals (Mn, Fe, Co, Ni, Cu) were immobilized on silica gel for hydrosilylation.
- Initial investigations focused on M(tpy)X2 @SiO2 /H2 O systems, where M represents the metal and X represents the halide.
Purpose of the Study:
- To investigate the catalytic activity of immobilized base metal-terpyridine complexes for hydrosilylation.
- To evaluate the reusability and stability of these catalytic systems.
- To develop a reusable and efficient hydrosilylation catalyst.
Main Methods:
- Immobilization of base metal-terpyridine complexes onto silica gel and glassware surfaces.
- Catalytic hydrosilylation reactions using 1-octene and diphenylsilane.
- Evaluation of catalytic activity and reusability under various conditions, including the use of activators like NaBHEt3.
Main Results:
- Co(tpy)Br2 @SiO2 /H2 O with NaBHEt3 showed high activity for anti-Markovnikov hydrosilylation but suffered from decreased reusability due to complex detachment.
- Co(tpy)(OAc)2 - and Co(tpy)(OH)2 -immobilized silica gels catalyzed hydrosilylation without an activator.
- Co(tpy)(OH)2 immobilized on glassware exhibited stable catalytic activity over 10 repeated uses without significant decrease.
Conclusions:
- Immobilized cobalt-terpyridine complexes are effective catalysts for hydrosilylation.
- Functionalizing glassware with Co(tpy)(OH)2 provides a highly reusable and stable catalytic system for hydrosilylation reactions.
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