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Synthesis and properties of optically active 1,1':5',1":5",1"'-hexol (QUANOL)
T Sugimur1, S Y Kurita, S Inoue
1Faculty of Science, Himeji Institute of Technology, Ako-gun, Hyogo, Japan. sugimura@sci.himeji-tech.ac.jp
Enantiomer
|July 4, 2001
Summary
Optically active quatemaphthalene-2,2
Area of Science:
- Organic Chemistry
- Stereochemistry
- Chiral Ligands
Background:
- Chiral ligands are crucial in asymmetric synthesis.
- 1,1':5',1":5",1'"-quatemaphthalene-2,2',6',2",6",2"-hexol (QUANOL) is a novel chiral scaffold.
- Understanding its properties is key for developing new catalytic systems.
Purpose of the Study:
- To synthesize optically active (R,R,R)- and (R,S,R)-QUANOL.
- To investigate the chiroptical properties of QUANOL derivatives.
- To evaluate QUANOL's potential as a chiral ligand.
Main Methods:
- Multi-step synthesis starting from (R)-BINOL.
- Circular Dichroism (CD) spectroscopy for chiroptical analysis.
- Characterization of basic properties relevant to ligand applications.
Main Results:
- Successful synthesis of (R,R,R)- and (R,S,R)-QUANOL in five steps.
- CD spectrum analysis revealed a larger A value for (R,R,R)-QUANOL compared to (R)-BINOL and (R,S,R)-QUANOL.
- Non-additivity of axial chiralities was observed in the A value.
Conclusions:
- QUANOL derivatives can be prepared with defined stereochemistry.
- (R,R,R)-QUANOL exhibits distinct chiroptical properties.
- QUANOL shows potential for applications as a chiral ligand in asymmetric synthesis.