Carbon-13 NMR spectra of monosubstituted pyrazines

Autor:	C. J. Turner, G. W. H. Cheeseman
Rok vydání:	1974
Předmět:	Deuterium NMR Chemistry Carbon-13 NMR satellite Chemical shift Substituent General Chemistry Carbon-13 NMR Tautomer chemistry.chemical_compound Computational chemistry Amide Proton NMR Organic chemistry General Materials Science
Zdroj:	Organic Magnetic Resonance. 6:663-666
ISSN:	1097-458X 0030-4921
DOI:	10.1002/mrc.1270061212
Popis:	Carbon-13 NMR chemical shifts and one-bond carbon–hydrogen coupling constants have been obtained at 15·09 MHz. The trends in the carbon chemical shifts obtained for the pyrazines parallel those of monosubstituted benzenes and 2-substituted pyridines, except for the direct effect of substitution where the pyrazines resemble pyridines not benzenes. The substituent effects on the 13C NMR spectra are generally quite similar to those in the 1H NMR spectra. The 13C NMR spectrum of the tautomeric hydroxypyrazine has been compared with the 13C NMR spectra of 2-, 3- and 4-hydroxypyridines. Hydroxy compounds that can exist as a cyclic amide show a large meta substituent effect on the chemical carbon shift.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::507efdab40a938500d1ed314ce938acd https://doi.org/10.1002/mrc.1270061212 Zobrazit plný text záznamu Plný text