Electronic spectra and structure of 2-iodopicolines, their N-oxides and 2-iodo-4-nitropicoline N-oxides
β Scribed by Aniela Puszko
- Publisher
- Elsevier Science
- Year
- 1995
- Tongue
- English
- Weight
- 438 KB
- Volume
- 344
- Category
- Article
- ISSN
- 0022-2860
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## Abstract The ^13^C NMR spectra of 2βhalopicolines, 2βhalopicoline __N__βoxides and 2βhaloβ4βnitropicoline __N__βoxides were recorded and their chemical shifts assigned. The influence of the electronic properties of the substituents on the direction of the chemical shifts is discussed.
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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