– (2E)-Pent-2-enoic acid is an unsaturated carboxylic acid, also known as 2-pentenoic acid or crotonic acid. The designation “2E” indicates that the molecule has a trans configuration of the double bond, with the two carbon atoms on opposite sides. This compound has an irritant odor and is miscible with water and most organic solvents. It is commonly used in organic synthesis as a starting material for various chemical reactions, including esterification, oxidation, and reduction. Additionally, its potential application as a flavoring agent in the food industry has been explored.