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Lewis acidic behavior of B(C6Cl5)3
Haiyan Zhao1, Joseph H Reibenspies, François P Gabbaï
1Department of Chemistry, Texas A&M University, College Station, Texas 77843, USA.
Dalton Transactions (Cambridge, England : 2003)
|August 14, 2012
Summary
Tris(pentachlorophenyl)borane, a bulky Lewis acid, effectively forms complexes with small anions like fluoride and organic Lewis bases such as p-dimethylaminopyridine.
Area of Science:
- Inorganic Chemistry
- Organometallic Chemistry
Background:
- Lewis acids are crucial in catalysis and synthesis.
- Steric hindrance can impede Lewis acid complexation.
- Boron compounds offer diverse Lewis acidity.
Purpose of the Study:
- To investigate the Lewis acidity of tris(pentachlorophenyl)borane (B(C6Cl5)3).
- To determine if bulky Lewis acids can form complexes with small Lewis bases.
- To explore the coordination chemistry of B(C6Cl5)3.
Main Methods:
- Synthesis of B(C6Cl5)3.
- Complexation reactions with fluoride ions and p-dimethylaminopyridine.
- Characterization of the resulting complexes (e.g., via NMR, X-ray crystallography - *implied, not explicitly stated in abstract*).
Main Results:
- B(C6Cl5)3 exhibits potent Lewis acidity.
- Despite significant steric bulk from the pentachlorophenyl groups, B(C6Cl5)3 forms stable complexes.
- Complexation was observed with small anions like fluoride.
- Complexation was also achieved with organic Lewis bases, exemplified by p-dimethylaminopyridine.
Conclusions:
- Steric bulk does not prevent B(C6Cl5)3 from acting as a Lewis acid.
- B(C6Cl5)3 is a versatile Lewis acid capable of coordinating with various small Lewis bases.
- This finding expands the scope of sterically hindered Lewis acids in chemical synthesis.
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