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Facile resolution of constrained geometry indenyl-phenoxide ligation
Luke E Turner1, Matthew G Thorn, Phillip E Fanwick
1Department of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, IN 47907-2038, USA.
Chemical Communications (Cambridge, England)
|May 30, 2003
Summary
Chiral binaphthoxide ligands successfully resolved the 2-(inden-3-yl)phenoxide ligand. This resolution was achieved at both tetrahedral and octahedral Group 4 metal centers, advancing asymmetric synthesis.
Area of Science:
- Organometallic Chemistry
- Asymmetric Synthesis
Background:
- The development of chiral ligands is crucial for enantioselective transformations.
- Group 4 metals (Titanium, Zirconium, Hafnium) are important in catalysis.
- The 2-(inden-3-yl)phenoxide ligand presents a unique structural motif for coordination chemistry.
Purpose of the Study:
- To investigate the chiral resolution of the 2-(inden-3-yl)phenoxide ligand.
- To explore the coordination behavior of this ligand with Group 4 metals in different geometries.
Main Methods:
- Synthesis of Group 4 metal complexes featuring the 2-(inden-3-yl)phenoxide ligand.
- Chiral resolution using enantiomerically pure binaphthoxide ligands.
- Characterization of the resulting metal complexes using spectroscopic and crystallographic techniques.
Main Results:
- The 2-(inden-3-yl)phenoxide ligand was successfully resolved.
- Resolution was demonstrated for both tetrahedral and octahedral Group 4 metal complexes.
- The chiral binaphthoxide auxiliary effectively induced enantioselectivity.
Conclusions:
- Chiral binaphthoxide ligands are effective resolving agents for the 2-(inden-3-yl)phenoxide ligand.
- This methodology provides access to enantiomerically enriched Group 4 metal complexes.
- Opens new avenues for asymmetric catalysis using Group 4 metals.