Decrease in the observed1H-13C spin-spin coupling constants in the presence of paramagnetic relaxation reagents
โ Scribed by V. M. Nekipelov
- Publisher
- SP MAIK Nauka/Interperiodica
- Year
- 1986
- Tongue
- English
- Weight
- 392 KB
- Volume
- 27
- Category
- Article
- ISSN
- 0022-4766
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## Abstract A series of alicyclic compounds with dihedral angles of 0ยฐ, 60ยฐ, 90ยฐ, 120ยฐ and 180ยฐ between a ^13^Cโlabelled carbon atom and a carbon atom separated by three bonds from the label has been synthesized. The vicinal ^13^C^13^C spin coupling constants were measured, and from the results a K
## Abstract The magnitude of the NMR spinโspin coupling constant, ^3^__J__(CH), between a vicinal ^13^Cโ^1^H pair depends, __inter alia__, on the value of the torsion angle ฮฆ~CH~(^13^C๏ฃฟC๏ฃฟC๏ฃฟH) and is influenced by the presence of an electronegative substituent located on the coupling ^13^C nucleus.