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Published on: March 12, 2015
Monomeric tri-coordinated bis(ferrocenyl)haloalumanes
Togo Anzai1, Koh Sugamata2, Takahiro Sasamori1,3
1Graduate School of Science and Technology, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8571, Japan. sasamori@chem.tsukuba.ac.jp.
Sterically demanding ferrocenyl lithium reacted with aluminum trihalides to form bis(ferrocenyl)haloalumanes. Unexpected aluminum migration occurred with AlI3, revealing monomeric structures with Al-Fe interactions.
Area of Science:
- Organometallic chemistry
- Main group chemistry
- Ferrocene chemistry
Background:
- Ferrocene derivatives are versatile organometallic compounds.
- Sterically hindered organolithium reagents offer unique reactivity.
- Aluminum halides are common Lewis acids in synthesis.
Purpose of the Study:
- To investigate the reactions of a sterically demanding ferrocenyl lithium dimer with aluminum trihalides.
- To characterize the resulting bis(ferrocenyl)haloalumanes.
- To explore the structural features and bonding in the products.
Main Methods:
- Reaction of ferrocenyl lithium dimer with AlCl3, AlBr3, and AlI3.
- Isolation and characterization of monomeric bis(ferrocenyl)haloalumanes.
- X-ray crystallography to determine molecular structures.
Main Results:
- Monomeric bis(ferrocenyl)haloalumanes were successfully synthesized.
- An unexpected intramolecular 1,1'-aluminum migration was observed with AlI3.
- The monomeric structures feature a tri-coordinated aluminum atom with Al-Fe interactions.
Conclusions:
- Sterically demanding ferrocenyl lithium reagents react with aluminum trihalides to yield novel haloalumanes.
- The observed aluminum migration highlights unique reactivity pathways in ferrocene chemistry.
- The Al-Fe interactions suggest interesting electronic communication between the aluminum and ferrocene centers.
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