It has long been discussed whether "5-nitrosotropolone" I takes the nitroso structure 1A or the tautomeric oxime structure 1B. Analysis of NMR and UV spectra data in this study indicates that the tropoquinone-5-monoxime 1B is preferred. The UV absorption shift to longer wavelength at dilute solutions is attributable to the dissociated form 3.
It has long been discussed whether "5-nitrosotropolone" I takes the nitroso structure 1A or the tautomeric oxime structure 1B. Analysis of NMR and UV spectra data in this study indicates that the tropoquinone-5-monoxime 1B is preferred. The UV absorption shift to longer wavelength at dilute solutions is attributable to the dissociated form 3.
It has long been discussed whether "5-nitrosotropolone" I takes the nitroso structure 1A or the tautomeric oxime structure 1B. Analysis of NMR and UV spectra data in this study indicates that the tropoquinone-5-monoxime 1B is preferred. The UV absorption shift to longer wavelength at dilute solutions is attributable to the dissociated form 3.