Diisobutene

Diisobutene (also known as Diisobutylene and Isooctene) refers to a pair of organic compounds with the overall formula C8H16. The isomers have the same carbon skeleton but differ in the location of the C=C bond. Both are colorless liquids with very similar physical properties. These compounds arise via the acid catalyzed dimerization of isobutene, a reaction that proceeds via the carbocation (CH3)3C+. The process also leads to some triisobutenes and tetraisobutenes.

Diisobutene isomers
Image Mixed isomers
Structure CH2=C(CH3)-CH2C(CH3)3 (CH3)2C=CHC(CH3)3
Systematic name 2,4,4-Trimethyl-1-pentene 2,4,4-Trimethyl-2-pentene 2,4,4-trimethylpentene
CAS number [107-39-1] [107-40-4] [25167-70-8]
Density 0.7150 g/mL 0.7218 g/mL 0.717 g/mL
Melting point -93.5 °C -106.3 °C -50 °C
Boiling point 101.4 °C 104.9 °C 102 °C
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