1propyne1carboxylic

1propyne1carboxylic, also known as propiolic acid, is an organic compound with the chemical formula C4H4O2. It is a three-carbon alkyne with a carboxylic acid functional group. The structure features a triple bond between the first and second carbon atoms, with the carboxylic acid group attached to the first carbon. It is a colorless solid with a sharp odor.

Propiolic acid is a reactive molecule due to the presence of both the alkyne and carboxylic acid functionalities. It can undergo various addition reactions characteristic of alkynes, such as hydrogenation and halogenation. The carboxylic acid group allows it to participate in esterification, salt formation, and other typical acid reactions. It is soluble in water and many organic solvents.

This compound finds limited direct applications but serves as a building block in organic synthesis. It can be used to prepare other more complex organic molecules. Its derivatives are sometimes explored for pharmaceutical or material science purposes. Propiolic acid is generally handled with care due to its reactivity and potential irritant properties.