## Abstract The ^13^C^13^C spin–spin coupling constants in natural abundance oxetane, thietane, cyclobutanone, bromo‐and chlorocyclobutane have been measured. Furthermore, the ^13^C isotope‐induced changes in the chemical shifts of the different ^13^C nuclei in the molecules mentioned above are re
Substituent effects on 13C–15N spin couplings and 13C chemical shifts in benzylideneanilines
✍ Scribed by T. Axenrod; X. H. Huang; M. J. Wieder; C. M. Watnick
- Publisher
- John Wiley and Sons
- Year
- 1986
- Tongue
- English
- Weight
- 226 KB
- Volume
- 24
- Category
- Article
- ISSN
- 0749-1581
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📜 SIMILAR VOLUMES
## Abstract Long range inter‐ring ^13^C^13^C couplings are found to be effective in the title compounds, and the magnitudes of coupling constants and of substituent effects on ^13^C chemical shifts, as well as the signs of the latter, alternate with respect to the number of connecting bonds.
## Abstract The effects of an hydroxy substituent on ^13^C^13^C coupling constants and ^13^C chemical shifts have been measured in 1‐hydroxynaphthalene‐2‐^13^C and 1‐hydroxypyrene‐1‐^13^C. The changes observed in the ^13^C^13^C couplings show the effect of a substituent attached directly to the l
## Abstract A series of 7‐^13^C‐labeled __o__‐substituted toluene derivatives and carboxyl‐^13^C‐isocrotonic and crotonic acid were synthesized and studied by ^13^C NMR spectroscopy to obtain ^13^C^13^C spin‐spin coupling constants involving the labeled carbon. The __cis__ ^3^__J__(CC) values were
## Abstract The dipeptide alanylproline has been prepared with the proline residue both ^13^C (15%) and ^15^N (95%) enriched. ^15^N NMR spectra of alanylproline reveal signals for both possible conformations—__cis__ and __trans__—of the dipeptide backbone in solution. Different p__K__ values for bo
## Abstract ^1^__J__(^15^N^13^C) values obtained from FT ^13^C NMR spectra were measured for a number of ^15^N‐enriched aniline derivatives and are found to exhibit varying degrees of dependence on the nature of the ring substituent. Theoretical calculations of ^1^__J__(^15^N^13^C) values for repre