## Abstract One bond and long range ^13^C^1^H coupling constants for some methoxy‐, amino‐ and hydroxypyridines are described. An unambiguous assignment of carbon‐13 resonances is carried out based on the analysis of the fine splitting caused by long range couplings. __J__ values for compounds oth
Long range 13C1H coupling constants. III—methylpyridines
✍ Scribed by Yoshito Takeuchi
- Publisher
- John Wiley and Sons
- Year
- 1975
- Tongue
- English
- Weight
- 312 KB
- Volume
- 7
- Category
- Article
- ISSN
- 0749-1581
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✦ Synopsis
Abstract
Proton coupled carbon‐13 NMR spectra of eleven mono‐, di‐ and trimethylpyridines were analysed on a first order basis. The long range ^13^C^1^H coupling constants are similar to those observed for pyridine and cyanopyridines.
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## Abstract Long‐range ^13^C^1^H coupling constants exceeding 0.3 Hz were measured for the hydrocarbons 3‐carene and α‐pinene by a heteronuclear 2D __J__‐resolved proton‐flip experiment with selective proton excitation. The dependences of the vicinal ^3^__J__(C, H) coupling constants on the dihedr
## Abstract Chemical shifts and long‐range ^13^C, ^1^H coupling constants to the two carbonyl C atoms were determined for a series of ethyl 2‐acyloxy‐2‐alkenoates. The ^3^__J__(C,H) coupling constant across the double bond is 9.5–10.1 Hz for the __E__‐ and 2.9–3.8 Hz for the __Z__‐isomer. ^3^__J__(
## Abstract Long range ^13^C^1^H coupling constants are reported for a number of methylquinoline derivatives. The results have been compared with those observed in the pyridine series and correlated with ^1^H^1^H coupling constants.