C8H9N

C8H9N is a molecular formula that denotes any compound composed of eight carbon atoms, nine hydrogen atoms, and one nitrogen atom. Because multiple structural arrangements fit this formula, C8H9N corresponds to several structural isomers, including heterocycles and amine-containing aromatic compounds. The exact structure must be determined by analytical methods such as spectroscopic analysis.

One well-known compound with this formula is indoline (2,3-dihydroindole), a bicyclic heterocycle in which a benzene ring is fused to a saturated five-membered ring containing nitrogen. Indoline serves as a useful scaffold in organic synthesis and pharmaceutical research, and it is related to indole, a planar aromatic heterocycle with formula C8H7N.

Other isomers of C8H9N exist and can include different arrangements of carbon, hydrogen, and nitrogen atoms, yielding variations such as distinct amines or heterocyclic frameworks. The presence of a single nitrogen atom with eight carbons allows a range of connectivity and functional groups, so the properties and applications depend strongly on the specific structure.

The approximate molecular weight of C8H9N is about 119.17 g/mol. As with any formula, the plain empirical formula C8H9N does not specify properties such as reactivity, odor, or safety; these depend on the exact arrangement of atoms in the molecule. See also Indole, a related compound with formula C8H7N.