polien
Polyenes are organic compounds characterized by multiple conjugated carbon–carbon double bonds, forming extended pi-systems. They can be linear, cyclic, or macrocyclic, and their alternating single and double bonds allow electrons to delocalize across the molecule. The degree of conjugation determines the color and light-absorption properties of polyenes, with longer chains absorbing longer wavelengths of light.
In nature, polyenes are common pigments and light-harvesting components. Carotenoids such as beta-carotene, lycopene, and lutein
Polyenes have significant roles in chemistry, biology, and materials science. They serve as pigments and dyes,
Synthesis and reactivity are driven by conjugation. Polyenes can be prepared by building up conjugated units