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Nitrogen and carbon NMR of some benzofuroxans
Author(s) -
Witanowski M.,
Stefaniak L.,
Biernat S.,
Webb G. A.
Publication year - 1980
Publication title -
organic magnetic resonance
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0030-4921
DOI - 10.1002/mrc.1270140506
Subject(s) - furoxan , tautomer , chemical shift , nitro , benzene , chemistry , valence (chemistry) , ring (chemistry) , additive function , nitrogen , molecule , carbon 13 nmr , aryl , stereochemistry , computational chemistry , medicinal chemistry , organic chemistry , nitric oxide , mathematics , alkyl , mathematical analysis
15 N and 14 N NMR spectra show that there is no valence tautomerism involving the nitro group in nitro derivatives of benzofuroxan systems and that the N ‐oxide function has a fixed position in the furoxan ring. Carbon chemical shifts of molecules with one, two or three furoxan rings attached to a benzene ring reveal additivity of effects which makes possible a complete and unambiguous assignment of the shifts.