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Organic compounds with two carbon-carbon double bonds are dienes; those with three such double bonds are trienes; those with four are tetraenes, etc.
Normally carbon-carbon double bonds which are not conjugated or only conjugated with only one or two other carbon-carbon double bonds have high enough energy that they absorb in the ultraviolet region of a spectrum, but the absorption energy state of polyenes with numerous conjugated double bonds can be lowered such that they enter the visible region of the spectrum, resulting in compounds which are colored yellow or other colors.
Many fatty acids are polyenes, and many dyes contain linear polyenes. Other examples of polyene compounds include beta-carotene, which is yellow to orange colored depending on concentration, and polyene antimycotics, some of which are yellow colored.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Polyene". A list of authors is available in Wikipedia.|