SDS of cas: 1127-45-3. The fused heterocycle is formed by combining a benzene ring with a single heterocycle, or two or more single heterocycles. Compound: 8-Hydroxyquinoline 1-oxide, is researched, Molecular C9H7NO2, CAS is 1127-45-3, about Natural abundance oxygen-17 NMR spectroscopy of heterocyclic N-oxides and di-N-oxides. Structural effects. Author is Boykin, D. W.; Balakrishnan, P.; Baumstark, A. L..
The 17O chem. shift data for a series of azine N-oxides, diazine N-oxides and di-N-oxides at natural abundance are reported. Isomeric Me substituted quinoline N-oxides exhibited chem. shifts which are interpreted in terms of electronic and compressional effects. The 17O chem. shift for 8-methylquinoline N-oxide (370 ppm) is deshielded by 25 ppm more than predicted, based upon electronic considerations. The 17O chem. shift for the N-oxide of 8-hydroxyquinoline (289 ppm) is substantially shielded as a result of intramol. hydrogen bonding. The relative 17O chem. shifts for diazine N-oxides of pyrazine, pyridazine and pyrimidine follow predictions based on back donation considerations. Because of solubility limitations, spectra of only 2 N,N’-dioxides were obtained. The chem. shift of benzopyrazine di-N-oxide in acetonitrile was shielded by 18 ppm compared to that of its mono N-oxide.
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Quinoxaline – Wikipedia,
Quinoxaline | C8H6N2 | ChemSpider