Isobutylene (a.k.a. Isobutene) is one of the butylene isomers, a group of four-carbon olefins. The carbon-carbon double bond controls the chemistry of this group, acting as a substitute, and affecting the reactivity of the carbon atoms at the alpha positions through the formation of the allylic resonance structure. This structure can stabilize both positive and negative charges. Thus allylic carbons are more reactive to substitution and addition reactions than alkane carbons. As a consequence, Isobutylene is used as an intermediate in the production of MTBE, ETBE, isooctane, and methacrolein. Polymerization of Isobutylene produces butyl rubber.
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