Used primarily as an intermediate in organic synthesis, especially in the production of pharmaceuticals, agrochemicals, and specialty polymers. It serves as an alkylating agent and is involved in reactions where a chlorine-functionalized hydrocarbon chain is needed. Its reactivity allows for the introduction of the 2-butenyl group into more complex molecules. It is also utilized in research settings for developing new chemical entities requiring selective carbon-chain modifications. Due to its volatility and reactivity, it is handled under controlled conditions in industrial and laboratory environments.