## Abstract The one‐bond coupling constant ^1^__J__ ^13^CH for the halogenated carbon in α‐halogenocyclohexanones is more important when the CH bond is in the equatorial then in the axial position. When a conformational equilibrium is present, the resulting coupling is a linear function of the eq
Determination of one-bond 14N13C coupling constants in amines using 13C T1ρ measurements
✍ Scribed by V. Mlynárik
- Publisher
- John Wiley and Sons
- Year
- 1981
- Tongue
- English
- Weight
- 190 KB
- Volume
- 17
- Category
- Article
- ISSN
- 0749-1581
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✦ Synopsis
Abstract
^13^C T~1ρ~ values measured for isobutylamine, diethylamine, pyrrolidine, piperidine and triethylamine yield one‐bond ^14^N^13^C coupling constants and ^14^N spin‐lattice relaxation times. A decrease of ^1^J(^14^N^13^C) was observed in sterically hindered secondary amines.
📜 SIMILAR VOLUMES
Four simple and sensitive HNCO-based methods for measurement of 1J(C'Calpha), 1J(NCalpha) and 2J(NCalpha) coupling constants in protein main chains are presented. Three of these experiments enable the simultaneous measurement of 1J(C'Calpha), 1J(NCalpha) and 2J(NCalpha) couplings. Exploitation of th
## Abstract The internal and overall motions of 1,3‐ and 1,4‐diethylpyridinium bromides have been studied by ^13^C relaxation. The enthalpies of activation for the rotation of the ethyl groups in positions 1 and 3 are deduced from the temperature dependence of the __T__~1~ values of the methylene a
## Abstract The ^31^P^31^P and ^13^C^31^P coupling constants in 1,6‐diphosphatriptycene have been obtained from analysis of its proton decoupled ^13^C n.m.r. spectra. More accurate data, however, resulted from simultaneous analysis of the proton decoupled ^13^C spectra and ^31^P(^13^C) satellite
## Abstract ^13^C chemical shieldings and ^14^N and ^2^H electric field gradient (EFG) tensors of L‐alanylglycine (L‐alagly) dipeptide were calculated at RHF/6–31 + + G\*\* and B3LYP/6–31 + + G\*\* levels of theory respectively. For these calculations a crystal structure of this dipeptide obtained