Portal de Periódicos da CAPES

Nitrogen and carbon NMR of some benzofuroxans

1980; Wiley; Volume: 14; Issue: 5 Linguagem: Inglês

10.1002/mrc.1270140506

0030-4921

M. Witanowski, L. Stefaniak, S. Biernat, G. A. Webb,

Chemical Reactions and Mechanisms

Abstract 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.