Used primarily in the production of butyl rubber, which is essential for manufacturing inner tubes, tire liners, and seals due to its low permeability to gases. Also serves as a key intermediate in synthesizing antioxidants, such as butylated hydroxytoluene (BHT), used in food preservation and plastics. Employed in the manufacture of methyl tert-butyl ether (MTBE), a fuel additive that enhances octane ratings and reduces engine knocking in gasoline. Additionally, utilized in the production of specialty chemicals like isooctane for high-performance fuels and as a comonomer in certain types of polyethylene to improve flexibility and clarity.