17O‐Kernresonanz Untersuchungen an Benzofurazanoxid

Abstract

Abstract17O‐NMR spectra of benzofurazan oxide at room temperature show two resonance lines. This adds evidence to support the N‐oxide structure to be correct. The 17O spectra are dependent on temperature, due to an equilibration. The average lifetime of the tautomers is of the order of 10−4 s at + 45°C. The activation energy of the equilibrium is found to be 17,2 ± 1,5 kcal/mole and the frequency factor is 3 · 1014 to 3 · 1016 s−1.