## Abstract ^15^N chemical shifts of 32 substituted pyridines and 19 substituted pyrimidines, together with additional data from the literature, are used to evalute substituent increments, A~i~ and A~ik~, in the respective series. Differential chemical shifts, ΞΞ΄(N), correlate with corresponding ΞΞ΄
15N NMR spectra of pyrimidine and [1,3-15N2]pyrimidine
β Scribed by C. M. Adams; W. Von Philipsborn
- Publisher
- John Wiley and Sons
- Year
- 1985
- Tongue
- English
- Weight
- 290 KB
- Volume
- 23
- Category
- Article
- ISSN
- 0749-1581
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β¦ Synopsis
The M y proton-coupled 15N NMR spectra of pyrimidine with natural isotope abundance and of bis-labelled [1,3-"N2]p~dine, obtained using single pulse experiments, are described. The "N and 'H spectra are analysed for "J, 'J and 4J(NH) as well as N,N and H,H coupling constants.
π SIMILAR VOLUMES
## REFERENCE DATA carbons, for various substituent groups and positions were carried out by gated decoupling with NOE. ## RESULTS AND DISCUSSION The I3C NMR chemical shifts of the compounds are shown in Tables 123; 'J(CH) and long-range coupling constants of 2, 9, 13 and 18, measured by gated d
4-15N-2,3,5-Trimethylpyrazine (A) was synthesized by dechlorination of 4-15N-6-chloro-2,3,5-trimethylpyrazine (I), the key intermediate, derived from 15N-D~alanine (a). 1-15N-2, 3,5-Trimethylpyrazine (2) was prepared by decarboxylation of 1-15N-2,3,5-trimethyl-pyrazine-6- carboxylic acid (10) obtai
## Abstract The ^15^N NMR spectra of Ξ±β, Ξ²β, Ξ³β and Ξ΄βcarboline and a series of methyl, dihydro and tetrahydro derivatives are reported.