In general, if the atoms that make up the ring contain heteroatoms, such rings become heterocycles, and organic compounds containing heterocycles are called heterocyclic compounds. An article called Application of the semiempirical M.O.-L.C.A.O. method to indoxazene and anthranil, published in 1960, which mentions a compound: 271-95-4, Name is 1,2-Benzisoxazole, Molecular C7H5NO, Application of 271-95-4.
The structures and properties of the 2 benzisoxazoles, indoxazene (I) and anthranil (II) is discussed in the light of a simple M.O.-L.C.A.O. treatment with inclusion of overlap and the results of calculations by use of the parameters of Orgel, et al. (CA 45, 7398h) are given. The practically equal values of the dipole moments of I and II were substantially reproduced and explained. The predicted comparatively good stability of I and II is to be attributed to the stabilizing effect of the fused benzene ring; the peculiar properties of II in comparison with similar isoxazole derivatives are correctly interpreted in the frame of the method used, under the assumption that II is actually an isoxazole derivative; and that the reactivities of I and II appear to agree with the charges found for their π-electron systems.
In addition to the literature in the link below, there is a lot of literature about this compound(1,2-Benzisoxazole)Application of 271-95-4, illustrating the importance and wide applicability of this compound(271-95-4).
Reference:
Highly efficient and robust molecular ruthenium catalysts for water oxidation,
Catalysts | Special Issue : Ruthenium Catalysts – MDPI