Nitroxides (aminyl oxydes) - XL. ESR spectroscopic studies of β-sulfonyl substituted vinyl nitroxides and of a vinylogous nitronyl nitroxide
作者:Hans Günter Aurich、Klaus-Dieter Möbus
DOI:10.1016/s0040-4020(01)89107-9
日期:1989.1
Oxidation of hydroxylamines 1 affords the vinyl nitroxides 4 via 2 and 3. The vinylogous nitronyl nitroxide 5 is formed upon oxidation of 1h. Whereas the methyl group X in 4a is freely rotating, rotation of substituents X in 4b–d is restricted as is indicated by their ESR spectra. Particularly, the less hindered vinyl nitroxides 4e–g form spin adducts 6 or 7 with their precursor nitrones 3. 4b coexists