cis2buteen

Cis-2-butene is an organic compound with the chemical formula C4H8. It is one of three structural isomers of butene, the others being trans-2-butene and 1-butene. In cis-2-butene, the two methyl groups are located on the same side of the double bond. This geometric arrangement is a consequence of the restricted rotation around the carbon-carbon double bond. It is a colorless gas at room temperature and pressure.

The physical properties of cis-2-butene differ from its isomers. It has a lower boiling point than trans-2-butene. Cis-2-butene is flammable and is typically produced through the catalytic dehydrogenation of butane or through the isomerization of other butene isomers. Its primary uses are as a precursor in the synthesis of other organic chemicals, particularly in the production of polymers and fine chemicals. It can also be used as a fuel additive.

The double bond in cis-2-butene is susceptible to electrophilic addition reactions, similar to other alkenes. Reactions such as hydrogenation, halogenation, and hydrohalogenation can occur, leading to the formation of saturated butane derivatives. The cis configuration can sometimes influence the stereochemistry of these addition reactions, though this is often dependent on the specific reaction conditions and reagents used.