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In chemistry, vinylene (also ethenylene or 1,2-ethenediyl) is a divalent functional group (a part of a molecule) with formula −CH=CH−; namely, two carbons, each connected to the other by a double bond, to an hydrogen atom by a single bond, and to the rest of the molecule by another single bond. This group can be viewed as a molecule of ethene (ethylene, H2C=CH2) with an hydrogen removed from each carbon; or a vinyl group −CH=CH2 with one hydrogen removed from the terminal carbon. It should not be confused with the vinylidene group =C=CH2 or >C=CH2. A vinylene unit attached to two distinct atoms other than hydrogen (namely R−CH=CH−R') is a source of cis-trans isomerism. The vinylene group is the repeating unit in polyacetylene and in polyenes. == See also == * vinyl, the monovalent group −CH=CH2 * vinylene carbonate 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「vinylene group」の詳細全文を読む スポンサード リンク
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