In chemistry, butylene may be an alternate name for the hydrocarbon butene, C4H8. It is also a divalent functional group with formula C4H82• that can be seen as the result of removing two hydrogen atoms from a butane molecule, leaving two free bonds.
There are several isomers of butylene, depending on the starting isomer of butane and the positions of the free bonds:
- From straight-chain butane (n-butane):
- 1,1-Butylene
- 1,2-Butylene
- 2,2-butylene
- 1,3-Butylene
- 2,3-Butylene (which has two stereoisomers, cis and trans)
- 1,4-Butylene
- From branched butane (isobutane, methylpropane):
- 1,1-Isobutylene
- 1,2-Isobutylene
- 1,3-Isobutylene