So far, in addition to halogen atoms, other non-metallic atoms can become part of the aromatic heterocycle, and the target ring system is still aromatic.Boykin, D. W.; Balakrishnan, P.; Baumstark, A. L. researched the compound: 8-Hydroxyquinoline 1-oxide( cas:1127-45-3 ).Synthetic Route of C9H7NO2.They published the article 《Natural abundance oxygen-17 NMR spectroscopy of heterocyclic N-oxides and di-N-oxides. Structural effects》 about this compound( cas:1127-45-3 ) in Journal of Heterocyclic Chemistry. Keywords: NMR oxygen heterocyclic oxide; azine oxide oxygen NMR. We’ll tell you more about this compound (cas:1127-45-3).
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