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Ring-closing olefin metathesis and radical cyclization as competing pathways.
Bernd Schmidt1, Michael Pohler, Burkhard Costisella
1FB Chemie-Organische Chemie, Universität Dortmund, Otto-Hahn-Strasse 6, D-44227 Dortmund, Germany. bschmidt@chemie.uni-dortmund.de
The Journal of Organic Chemistry
|February 14, 2004
Summary
First and second generation Grubbs
Area of Science:
- Organic Chemistry
- Catalysis
- Polymer Science
Background:
- Grubbs' catalysts are essential tools in organic synthesis.
- Understanding catalyst behavior is crucial for developing new synthetic routes.
Purpose of the Study:
- To investigate the cyclization pathways mediated by first and second generation Grubbs' catalysts.
- To determine the selectivity of these pathways under identical conditions.
Main Methods:
- Utilizing first and second generation Grubbs' catalysts.
- Performing cyclization reactions under controlled, identical conditions.
- Analyzing reaction products to identify cyclization modes.
Main Results:
- Both catalyst generations exhibited high selectivity for two distinct cyclization modes.
- Ring-closing metathesis and atom-transfer radical addition (ATRA) pathways were observed.
- Catalyst generation influenced the dominant cyclization pathway.
Conclusions:
- Grubbs' catalysts can mediate diverse cyclization reactions with high selectivity.
- The choice of catalyst generation impacts the reaction pathway, enabling control over synthetic outcomes.
- This finding offers new possibilities for designing complex molecular architectures.