✦ LIBER ✦
15N Nuclear magnetic resonance of some pyrazines, 1,2,4-triazines and their N-oxides. Correlation and interrelationship of 15N with 13C chemical shifts of π-deficient heterocyclic systems
✍ Scribed by Misa V. Jovanovic
- Publisher
- Elsevier Science
- Year
- 1984
- Tongue
- English
- Weight
- 459 KB
- Volume
- 40
- Category
- Article
- ISSN
- 1386-1425
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✦ Synopsis
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 shifts in