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
Heterocyclic N-oxides. Part VI. Synthesis and nuclear magnetic resonance spectra of 3-aminobenzo-1,2,4-triazines and their mono- and di-N-oxides
โ Scribed by Mason, J. C.; Tennant, G.
- Book ID
- 118129241
- Publisher
- Royal Society of Chemistry
- Year
- 1970
- Weight
- 644 KB
- Category
- Article
- ISSN
- 0045-6470
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๐ SIMILAR VOLUMES
The 15Nchemical shifts of a number of pyrazines, 1,2,4-triazines, and their N-oxides are reported. The shielding effects of a substituent ortho to a ring nitrogen on that nitrogen atom depend on the ITdeficiency of the heterocyclic ring. These n-deficiency values are related to ortho "C chemical shi
## Abstract The benzeneโinduced solvent effects upon the proton chemical shifts of various pyrazines, pyrimidines and their __N__โoxides are described. Larger chemical shift effects, implying closer benzeneheterocycle association, are noted in the __N__โoxides as compared to the nonโoxidized hetero
## Abstract Carbonโ13 NMR chemical shifts and ^1^__J__(CH), ^2^__J__(CH) and ^3^__J__(CH) coupling constants of selected saturated nitrogen heterocyclic molecules containing the acetylenic moiety have been determined. These NMR parameters have also been determined for the corresponding __N__โoxides