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Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex
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Chiral Recognition and Resolution of Phosphoric Acids Using Octahedral Cobalt Complexes.
Eun-Jeong Kwahk1, Nguyen H Nguyen2, Sumin Jang1
1Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Korea.
Organic Letters
|March 17, 2023
Summary
This study introduces a new method for determining the chirality of phosphoric acids using cobalt complexes and phosphorus-31 NMR spectroscopy. The technique accurately measures enantiopurity for various chiral phosphoric acids, including ATP.
Area of Science:
- Organic Chemistry
- Analytical Chemistry
- Spectroscopy
Background:
- Chiral phosphoric acids are important building blocks in organic synthesis.
- Accurate determination of enantiopurity for chiral phosphoric acids remains a challenge.
Purpose of the Study:
- To develop a novel method for chiral recognition and enantiopurity determination of phosphoric acids.
- To utilize cationic octahedral cobalt complexes for this purpose.
Main Methods:
- Formation of ion pairs between chiral phosphoric acids and cationic octahedral cobalt complexes.
- Analysis using phosphorus-31 Nuclear Magnetic Resonance (31P NMR) spectroscopy.
- Application of 31P{1H} NMR for resolving enantiomers.
Main Results:
- Successful chiral recognition and enantiopurity measurement of various chiral phosphoric acids.
- Demonstrated applicability to BINOL, H8-BINOL, SPINOL, VAPOL, VANOL derivatives, and ATP.
- Achieved high optical resolution with enantiomeric excess greater than 99% for one sample.
Conclusions:
- Cationic octahedral cobalt complexes provide an effective platform for chiral recognition of phosphoric acids.
- 31P NMR spectroscopy is a powerful tool for quantifying enantiopurity using this method.
- This approach offers a reliable solution for challenging chiral analyses in organic chemistry.
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