## Abstract ^15^N n.m.r. spectra of [^13^C‐2, 3‐^15^N~2~‐__guanidino__]arginine and [^13^C, ^15^N~2~] urea were obtained in D~2~O and H~2~O at a variety of pH values both with and without proton decoupling. The effects of the proton exchange rate are readily observable in the proton coupled ^15^N s
15N and 13C n.m.r. study of azimines and azoxybenzenes
✍ Scribed by W. Schwotzer; Ch. Leuenberger; L. Hoesch; A. S. Dreiding; W. von Philipsborn
- Publisher
- John Wiley and Sons
- Year
- 1977
- Tongue
- English
- Weight
- 195 KB
- Volume
- 9
- Category
- Article
- ISSN
- 0749-1581
No coin nor oath required. For personal study only.
✦ Synopsis
Abstract
^15^N chemical shifts, ^1^J(NN), ^1^J(NC) and ^2^J(NC) coupling constants have been used to prove the open chain structure and configuration of cis‐ and trans‐2,3‐diphenyl‐1‐phthalimidoazimines. For comparison, the corresponding data of the iso‐π‐electronic cis‐ and trans‐azoxybenzenes are also reported and discussed.
📜 SIMILAR VOLUMES
## Abstract The ^13^C and ^15^N n.m.r. results for a series of diazo compounds are reported. It is found that the diazo carbon is shielded by an extraordinary amount compared with normal sp^2^ hybridized carbons. The ^15^N chemical shifts reveal that the terminal nitrogen is deshielded relative to
## Abstract Carbon‐13 n.m.r. spectra of formic, acetic, propionic and butyric acid amides with __N__,__N__‐di‐__n__‐alkyl substituents have been completely assigned with the aid of extensive double resonance experiments. The data obtained were used to study long range steric effects on chemical and
## Abstract ^13^C and ^15^N NMR data for twelve __N__‐unsubstituted pyrrolidines are reported and __cis__ and __trans__ stereomers are assigned for 2,3‐, 2,4‐ and 2,5‐disubstituted compounds.
Labeled derivatives of N-methylolacrylamide (NMA) including 15 N-NMA, 13 C-NMA, and 13 C, 15 N-NMA were synthesized and purified. A required chemical precursor, 15 N-acrylamide, was also prepared. Reported methods for synthesizing unlabeled analogs are noted, and modifications to these methods for a
## Abstract The noise‐decoupled and gated‐decoupled ^13^C n.m.r. spectra of quercetin and rutin are studied and assignments are proposed. The previous assignments of carbons 2 and 4′, carbons 5 and 9, carbons 6 and 8 have been reversed.