Phosphorus 31P Spin–lattice relaxation times as a tool for the determination of the structure of 1,3-dithianes with P-containing substituents at the anomeric carbon atom
✍ Scribed by Marian Mikolajczyk; Krzysztof Wróblewski; Piotr P. Graczyk
- Publisher
- John Wiley and Sons
- Year
- 1992
- Tongue
- English
- Weight
- 261 KB
- Volume
- 30
- Category
- Article
- ISSN
- 0749-1581
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✦ Synopsis
Abstract
Relaxation times, T, due to the dipolar mechanism of relaxation of ^31^P nuclei were determined for eight pairs of 1,3‐dithianes with P‐containing substituents at the anomeric carbon atom. The separation of dipole–dipole from the total spin–lattice relaxation could be applied for the unambiguous assignment of configuration of the compounds under investigation. The T relaxation times are smaller for compounds with phosphorus located axially (cis). This observation is discussed in terms of internal rotation around the C‐2 bond and the distances between the phosphorus and axial H‐4,6 protons.