Spin-spin coupling constants between carbon-13 and bromine and their correlation with the s character of the carbon hybridization
✍ Scribed by Shigenobu Hayashi; Kikuko Hayamizu; Osamu Yamamoto
- Publisher
- Elsevier Science
- Year
- 1980
- Weight
- 710 KB
- Volume
- 37
- Category
- Article
- ISSN
- 0022-2364
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## 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
lIf and 13C NMR contact shifts have been observed for chloroform, methylene cblorido and phenylacetylene in the presence of di-tertbutyl nitroxido radical (DBNO). Upfield and downfield contact shifts were observed for 1~ and 13f.2 NMR resonances, respectively. The relative values of 13C contact shif