2-Cyano-2-ethylbutanoic acid is primarily used as an intermediate in organic synthesis, particularly in the production of pharmaceuticals and agrochemicals. Its structure, featuring both a cyano group and a carboxylic acid group, makes it a versatile building block for creating more complex molecules. It is often employed in the synthesis of active pharmaceutical ingredients (APIs) where the cyano group can be further modified or reduced to form amines or other functional groups. Additionally, it finds application in the development of herbicides and pesticides, where its chemical properties contribute to the efficacy of the final product. Its role in these industries highlights its importance in the development of compounds that require precise chemical modifications.