3-Methyl-4-pentenoic acid is primarily utilized in the synthesis of various organic compounds, particularly in the production of pharmaceuticals and agrochemicals. It serves as a key intermediate in the creation of active ingredients for medications, including those targeting inflammation and microbial infections. Additionally, it is employed in the development of herbicides and pesticides, contributing to crop protection and agricultural productivity. Its unique structure allows it to act as a building block in organic reactions, facilitating the creation of complex molecules with specific biological activities. In research, it is also used to study reaction mechanisms and develop new synthetic pathways in organic chemistry.