Abstract13C and15N chemical shift assignments of a number of 1,2‐benzisoxazole 2‐oxides and their deoxygenated analogues are reported and discussed. Similarly, assignments for some of the precursors to theN‐oxides,o‐hydroxyaryl ketoximes, are reported. In theN‐oxides the “push‐pull” effect of the NO dipole is largely localized on the isoxazole unit. A large (ca39 ppm) upfield shift of the C‐3 resonance is caused by the exocyclic oxygen whereas C‐7a and, to a lesser extent, C‐6 are the most heavily deshielded nuclei. The substituents do not have a significant effect on the C‐3 resonance, whereas their effect on the carbocyclic carbons is more pronounced, the most markedly affected being the C‐4 and C‐6 nuclei.N‐Oxidation of 1,2‐benzisoxazole causes a large (50.5