Pentanal is obtained by hydroformylation of butene. Benzene, Toluene, White Spirit, Poly Iso Butene and Sulphur. These acids can then be decarboxylated to produce butene and CO. These two isomers of butene have distinct properties. Styrene-butadiene copolymers can be produced with a low butene content. The catalyst protonates the alkenes (propene, butene) to produce carbocations, which alkylate isobutane. Butene, also known as butylene, is a series of alkenes with the general formula CH. The catalyst protonates the alkenes (propene, butene) to produce reactive carbocations, which alkylate isobutane.