Alkadienes

Isoprene, or 2-methyl-1,3-butadiene, is a common volatile organic compound with the formula CH2=C(CH3)−CH=CH2. In its pure form it is a colorless volatile liquid. It is produced by many plants and animals (including humans) and its polymers are the main component of natural rubber.

1,3-Butadiene () is an organic compound with the formula CH2=CH-CH=CH2. It is a colorless gas that is easily condensed to a liquid. It is important industrially as a precursor to synthetic rubber. The molecule can be viewed as the union of two vinyl groups. It is the simplest conjugated diene.

Propadiene () or allene () is the organic compound with the formula . It is the simplest allene, i.e. a compound with two adjacent carbon double bonds. As a constituent of MAPP gas, it has been used as a fuel for specialized welding.

Piperylene or 1,3-pentadiene is an organic compound with the formula . It is a volatile, flammable hydrocarbon. It is one of the five positional isomers of pentadiene.

1,2-Butadiene is the organic compound with the formula CH2=C=CHCH3. It is an isomer of 1,3-butadiene, which is a common monomer used to make synthetic rubber, and is often co-produced with it. It is a colorless flammable gas, one of the simplest substituted allenes.

1,5-Hexadiene is the organic compound with the formula (CH)(CH=CH). It is a colorless, volatile liquid. It is used as a crosslinking agent and precursor to a variety of other compounds.

1,7-Octadiene is an organic compound with the formula . It is a colorless liquid that serves as a precursor to specialty polymers. It arises commercially by the dimerization of butadiene in the presence of hydrogen. Some of the 1,6-octadiene is also formed. 1,7-Octadiene can be converted to the diol by hydroformylation followed by hydrogenation of the dialdehyde. In a related process, 1,7-Octadiene undergoes hydrocyanation to give dinitrile, which can be hydrogenated to give 1,10-diaminodecane. thumb|center|Conversion of butadiene to 1,10-difunctionalized decanes ==Dimethyloctadienes== Structu

Dimethylbutadiene, formally referred to as 2,3-dimethyl-1,3-butadiene, is an organic compound with the formula (CH3)2C4H4. It is colorless liquid which served an important role in the early history of synthetic rubber. It is now a specialty reagent.