## Abstract The application of selective population inversion (SPI) to the assignment of ^13^C resonances and to the determination of the relative sign of ^13^C^1^H coupling constants is demonstrated for 1‐phenyl‐1,2‐dibromo‐2‐nitroethane. A negative sign for the geminal C‐2H‐1 coupling constant
A convenient technique for the measurement and assignment of long-range carbon-13 proton coupling constants
✍ Scribed by James Keeler; David Neuhaus; Jeremy J. Titman
- Publisher
- Elsevier Science
- Year
- 1988
- Tongue
- English
- Weight
- 383 KB
- Volume
- 146
- Category
- Article
- ISSN
- 0009-2614
No coin nor oath required. For personal study only.
✦ Synopsis
A new technique is described which enables accurate values of heteronuclear long-range coupling constants to be obtained from highly distorted multiplets in two-dimensional correlation spectra. The technique uses a simple data fitting of the distorted multiplet with a model obtained from the conventional proton spectrum, and achieves high sensitivity by detecting the signals at the proton frequency.
📜 SIMILAR VOLUMES
A m d i e d version of the two-dimensional semiselective INEPT experiment is presented which allows the determination of long-range protowarbon couplings in medium-sized molecules. The difference in the TI relaxation times is utilized for the reduction of the number of protons from which coherence i
## Abstract The SELective INverse detection of carbon–proton CORrelation pulse sequence that yields a 1D spectrum of a proton directly bonded to a selected carbon resonance has been converted into a proton and carbon double‐selective variant that provides a ^1^H spectrum of a selected proton that i
The sign of the scalar coupling between a carbonyl carbon and ˛-proton J(C 0 ,H ˛), for the cyclic dipeptide cyclo(Leu-Gly) was determined relative to that between an amide proton and ˛-proton 3 J(H N ,H ˛) by an E.COSYtype HSQC experiment. The pulse sequence used in this experiment gives a cross pe