C5H5NO2

C5H5NO2 is the molecular formula for several chemical compounds. One common isomer is 2-hydroxy-3-methyl-5-ethylpyridine. This compound is a derivative of pyridine, a heterocyclic aromatic organic compound. Pyridine itself has a six-membered ring containing five carbon atoms and one nitrogen atom. In 2-hydroxy-3-methyl-5-ethylpyridine, a hydroxyl group (-OH) is attached to the second carbon atom, a methyl group (-CH3) to the third carbon atom, and an ethyl group (-C2H5) to the fifth carbon atom of the pyridine ring.

Another possible isomer with the formula C5H5NO2 is isonicotinic acid N-oxide. This compound is a derivative of isonicotinic acid, which is also known as pyridine-4-carboxylic acid. In isonicotinic acid N-oxide, the nitrogen atom in the pyridine ring is oxidized, forming an N-oxide functional group, and a carboxylic acid group (-COOH) is attached to the fourth carbon atom. The presence of the N-oxide group significantly alters the electronic properties and reactivity of the pyridine ring compared to the parent compound.

Other isomers may exist, each with a unique arrangement of the five carbon atoms, five hydrogen atoms, one nitrogen atom, and two oxygen atoms, leading to distinct chemical and physical properties. The specific properties and applications of a compound with the molecular formula C5H5NO2 depend entirely on its precise molecular structure, meaning which isomer is being considered. Research into these compounds can involve synthesis, characterization using techniques like NMR and mass spectrometry, and investigation of their potential uses in various fields of chemistry.