Conjugated hydrocarbons

system of connected p orbitals with delocalized electrons increasing molecular stability

In organic chemistry, polyenes are polyunsaturated organic compounds that contain multiple carbon–carbon double bonds (). Some sources consider dienes to be polyenes, whereas others require polyenes to contain three carbon–carbon double bonds (trienes) or more.

thumb|right|Diacetylene, the simplest polyyne

thumb|right|The structure of a conjugated enyne