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cycloalkene
A cycloalkene or cycloolefin is a type of alkene hydrocarbon which contains a closed ring of carbon atoms, but has no aromatic character. Some cycloalkenes, such as cyclobutene and cyclopentene, can be used as monomers to produce polymer chains. Due to geometrical considerations, smaller cycloalkenes are almost always the cis isomers, and the term cis tends to be omitted from the names. In larger rings (from around 8 atoms), cis–trans isomerism of the double bond may occur.
==Examples==
Image:Cyclopropene 2D skeletal.svg|Cyclopropene
Image:Cyclobutene.svg|Cyclobutene
Image:Cyclopentene.svg|Cyclopentene
Image:cyclohexene.svg|Cyclohexene
Image:Cycloheptene.svg|Cycloheptene
Image:1,3-cyclohexadiene.svg|1,3-Cyclohexadiene
Image:1,4-cyclohexadieen.png|1,4-Cyclohexadiene
Image:1,5-Cyclooctadiene.svg|1,5-Cyclooctadiene
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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