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The Synthesis of [Sn10(Si(SiMe3)3)4]2- Using a Metastable Sn(I) Halide Solution Synthesized via a Co-condensation Technique
Published on: November 28, 2016
Stille couplings catalytic in tin: a "Sn-F" approach
1Department of Chemistry, Michigan State University, East Lansing, MI 48824, USA. maleczka@cem.msu.edu
Organic Letters
|January 11, 2002
Summary
A novel tin recycling method enhances Stille couplings. Using a hypercoordinate polymethylhydrosiloxane (PMHS) and potassium fluoride (KF), trimethyltin hydride (Me3SnH) is efficiently recycled, reducing reaction times and trimethyltin hazards.
Area of Science:
- Organic Chemistry
- Catalysis
- Green Chemistry
Background:
- Stille coupling reactions are crucial in organic synthesis but often involve toxic and difficult-to-handle organotin reagents.
- Efficient recycling of tin reagents is essential for improving the sustainability and cost-effectiveness of Stille couplings.
- Previous methods for tin recycling have limitations in terms of reaction time and safety.
Purpose of the Study:
- To develop a new, efficient, and safer method for recycling tin reagents in Stille coupling reactions.
- To investigate the use of polymethylhydrosiloxane (PMHS) and potassium fluoride (KF) for tin recycling.
- To minimize the hazards associated with trimethyltin compounds.
Main Methods:
- A palladium(0)-catalyzed hydrostannation/Stille cascade reaction was employed.
- Polymethylhydrosiloxane (PMHS) was activated by aqueous potassium fluoride (KF) to form a hypercoordinate species.
- This activated PMHS facilitated the efficient recycling of trimethyltin hydride (Me3SnH).
Main Results:
- The developed method enables efficient recycling of Me3SnH during the catalytic cycle.
- Reaction times were significantly shorter compared to previously reported protocols.
- The process is believed to proceed via a Me3SnF intermediate, which mitigates the hazards of volatile trimethyltins.
Conclusions:
- A new and improved tin recycling strategy for Stille couplings has been successfully demonstrated.
- The use of hypercoordinate PMHS/KF offers a greener and safer alternative for handling organotin reagents.
- This method enhances the practicality and sustainability of Stille coupling reactions in organic synthesis.
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