C7H9NO

C7H9NO is a molecular formula representing a family of organic compounds that collectively contain seven carbon atoms, nine hydrogen atoms, one nitrogen atom, and one oxygen atom. It is not the formula for a single substance; numerous constitutional isomers share this composition. The formula has four degrees of unsaturation, suggesting the presence of an aromatic ring or a heterocycle, or an equivalent combination of rings and multiple bonds.

Mass and elemental composition: The nominal molecular mass is 123 g/mol. The precise monoisotopic mass for C7H9NO is about 123.0684 Da, while the common (average) molecular weight is approximately 123.15 g/mol.

Structural diversity: Isomers with this formula may feature aromatic systems with nitrogen- and oxygen-containing substituents, or small heterocycles in which nitrogen and oxygen are part of the ring or substituents. Possible motifs include amino- or carbonyl-containing derivatives, ether or hydroxyl substitutions, and various alkyl arrangements. Because multiple connectivity arrangements can realize the same elemental composition, C7H9NO encompasses a range of distinct chemicals.

Identification and use: In chemical databases, C7H9NO serves as a formula key for searching possible structures when only elemental composition is known. To identify a specific compound, researchers rely on spectroscopic and analytical data (such as NMR, IR, and mass spectrometry) to determine connectivity and stereochemistry. The formula is a starting point for inferring potential functional groups and guiding isolation or synthesis efforts, rather than a unique descriptor of a single compound.