## Abstract A gradient‐selected __J__‐HMBC experiment is presented. Coherence selection with magnetic field gradients results in HMBC spectra in which __t__~1~ noise is very low or completely eliminated. This makes it possible to detect unequivocally very small (<2 Hz) long‐range H,X coupling const
Determination and assignment of heteronuclear long-range coupling constants. Methods based on semiselective INEPT
✍ Scribed by Dušan Uhrín; Tibor Liptaj
- Publisher
- Elsevier Science
- Year
- 1989
- Weight
- 592 KB
- Volume
- 81
- Category
- Article
- ISSN
- 0022-2364
No coin nor oath required. For personal study only.
📜 SIMILAR VOLUMES
## Abstract 2D __J__—δ selective INEPT experiments were used to measure long‐range ^13^C,^1^H coupling constants for the macrolide antibiotics roxithromycin, erythromycin and their metabolites, RU 39001 and erythralosamine, respectively. The 2D __J__—δ selective INEPT experiment was performed using
## 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
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
Three new gradient-selected NMR experiments for the analysis of long-range heteronuclear coupling constants are presented. They are demonstrated on a series of compounds including sucrose, strychnine and a complex macrolide, phormidolide, isolated from a marine cyanobacterium. These 1D and 2D hetero