## 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
Relative sign determination of phosphorus-carbon coupling constants by 2D carbon-13 NMR spectroscopy
✍ Scribed by Randall, Leslie H.; Cherkas, Andrew A.; Carty, Arthur J.
- Book ID
- 127280293
- Publisher
- American Chemical Society
- Year
- 1989
- Tongue
- English
- Weight
- 444 KB
- Volume
- 8
- Category
- Article
- ISSN
- 0276-7333
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Long-range J(CH) values were measured for six glycoside derivatives by a selective 2D-J heteronuclear sequence. The values obtained are discussed in terms of conformational effects and constitute a valuable contribution to ' 5 and 3J comprehension.
## Abstract Two‐dimensional H,C‐COSY spectra of some vinyltin(IV) compounds were measured. The relative signs of __^n^J__(^119^Sn, ^13^C) and __^(n+1)^____J__(^119^Sn, ^1^H) coupling constants were determined after analysis of the orientation of appropriate ^119/117^Sn satellites in H,C‐COSY spectr