## Abstract Measurement of the ^13^C NMR spectra of the bridgehead nitro compounds __1a–5a__ has been performed. It is found that one‐bond ^13^C^15^N coupling is not necessarily a reflection of the degree of s character of the bridgehead carbon exocyclic bonding orbital. Although the magnitude of
15N13C coupling constants in 15N labelled azaadamantane
✍ Scribed by Stefan Berger; Hans Kaletsch
- Publisher
- John Wiley and Sons
- Year
- 1976
- Tongue
- English
- Weight
- 118 KB
- Volume
- 8
- Category
- Article
- ISSN
- 0749-1581
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✦ Synopsis
Abstract
The ^15^N^13^C coupling constants in ^15^N labelled azaadamantane have been measured and interpreted in terms of their conformational dependence as compared with ^15^N‐quinuclidine.
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## 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 The ^13^C,^15^N coupling constants in three 1,2,4‐triazine‐4‐^15^N derivatives and in a substituted pyrimidine‐1‐^15^N have been determined and are compared with those in pyridine and quinoline. Of special interest are the data of the 5‐(2‐dimethylamino‐1‐propenyl)‐3,6‐dimethyl‐1,2,4‐tr
## Abstract ^15^N‐enriched dihydroxamic acids (HONHCO(CH~2~)~__n__~CONHOH, __n__ = 0, 1, and 2) were prepared and their spectra NMR (^1^H, ^13^C, ^15^N) recorded in dimethyl sulfoxide (DMSO) solutions with the aim of determining ^15^N coupling constants (^15^N^1^H and ^15^N^13^C). The results sup
## Abstract Geminal ^15^N^13^C coupling constants have been measured in a series of ^15^N‐enriched 1‒phenyl‒3,5‒dialkyl‐substituted pyrazoles. The importance of the orientation of the nitrogen lone‐pair in determining the magnitude of ^2^__J__(^15^N^13^C) values is reflected in the enhanced coupli