## Abstract ^1^H and ^13^C NMR spectra of symmetrically substituted cyclotriphosphazenes exhibit second‐order effects. The influence of the ^31^P,^31^P coupling constants between ring phosphorus atoms on these effects was studied. Some values of this coupling constant between phosphorus bearing ide
Position specificity of 13C31P coupling constants for methyl substituents in phospholes and 2—Phospholenes
✍ Scribed by L. D. Quin; S. G. Borleske; R. C. Stocks
- Publisher
- John Wiley and Sons
- Year
- 1973
- Tongue
- English
- Weight
- 141 KB
- Volume
- 5
- Category
- Article
- ISSN
- 0749-1581
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✦ Synopsis
Abstract
The ^13^C—^31^P coupling constant is much larger for a 2‐methyl substituent (about 20 Hz) than for a 3‐methyl substituent (about 5 Hz) in phospholes and 2‐phospholenes, and appears useful for assigning structures in these compounds.
📜 SIMILAR VOLUMES
## Abstract The indirect determination of PP coupling constants and their relative signs in some symmetrical diphosphonates by ^31^P^13^C 2D NMR is introduced. Advantages and disadvantages of this method and others for the determination of the coupling constants of chemically equivalent nuclei ar
A two-dimensional { 31 P} spin-echo-difference constant-time [ 13 C, 1 H]-HMQC experiment (2D { 31 P}-sedct-[ 13 C, 1 H]-HMQC) is introduced for measurements of 3 J C4P and 3 J H3P scalar couplings in large 13 C-labeled nucleic acids and in DNA-protein complexes. This experiment makes use of the fac