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Updated: Jun 24, 2026

Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex
Published on: July 27, 2022
Comparing various chiral dirhodium tetracarboxylates in the dirhodium method
Jens T Mattiza1, Nobuyuki Harada, Shunsuke Kuwahara
1Institute of Organic Chemistry, Leibniz University Hannover, Hannover, Germany.
Chiral ligands can be differentiated using three enantiopure dirhodium tetracarboxylates. The (S)-2-methoxy-2-(1-naphthyl) propionate and (S)-N-phthaloyl-(S)-tert.-leucinate complexes show varying effectiveness for different donor types.
Area of Science:
- Coordination Chemistry
- Organic Synthesis
- Analytical Chemistry
Background:
- Chiral ligands are crucial in asymmetric synthesis.
- Developing effective methods for chiral ligand differentiation is essential.
- Dirhodium tetracarboxylates are known for their catalytic and analytical applications.
Purpose of the Study:
- To compare the NMR properties of three enantiopure dirhodium tetracarboxylates.
- To evaluate their efficacy in differentiating various chiral ligands.
- To establish a dirhodium method for chiral analysis.
Main Methods:
- Synthesis of three enantiopure dirhodium tetracarboxylate complexes.
- NMR spectroscopy analysis of the complexes with different chiral ligands.
- Correlation of NMR data with ligand properties and conformational analysis.
Main Results:
- The dirhodium complex with (S)-2-methoxy-2-(1-naphthyl) propionate (Rh2) outperformed the Mosher acid anion complex (Rh1) for strong donors.
- Rh2 was less effective than Rh1 for weak donors.
- The dirhodium tetracarboxylate complex with (S)-N-phthaloyl-(S)-tert.-leucinate (Rh3) was generally more effective than Rh1.
Conclusions:
- The effectiveness of dirhodium tetracarboxylates in chiral ligand differentiation varies based on the ligand structure and donor strength.
- Conformational behavior and ring-current effects of aryl groups influence NMR differentiation.
- The dirhodium method offers a valuable tool for analyzing chiral ligands.
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