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・ Methylorhabdus multivorans
・ Methylornithine
・ Methylornithine synthase
・ Methylosphaera hansonii
・ Methyldopamine
・ Methylecgonidine
・ Methylecgonine cinnamate
・ Methylecgonone reductase
・ Methylene
・ Methylene (compound)
・ Methylene blue
・ Methylene bridge
・ Methylene cyclopropyl acetic acid
・ Methylene diphenyl diisocyanate
・ Methylene green
Methylene group
・ Methylene-fatty-acyl-phospholipid synthase
・ Methylenecyclohexane
・ Methylenecyclopropane
・ Methylenecyclopropene
・ Methylenedioxy
・ Methylenedioxyallylamphetamine
・ Methylenedioxyamphetamine
・ Methylenedioxybenzylamphetamine
・ Methylenedioxybenzylpiperazine
・ Methylenedioxybutylamphetamine
・ Methylenedioxycathinone
・ Methylenedioxycyclopropylmethylamphetamine
・ Methylenedioxydimethylamphetamine
・ Methylenedioxyethylamphetamine


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Methylene group : ウィキペディア英語版
Methylene group


In organic chemistry, a methylene group is any part of a molecule that consists of two hydrogen atoms bound to a carbon atom, which is connected to the remainder of the molecule by a double bond. The group may be written , where the '=' denotes the double bond. This structural element is also called methylidene.
Many organic compounds are named and classified as if they were the result of substituting a methylene group for two adjacent hydrogen atoms of some parent molecule (even if they are not actually obtained that way). Thus, for example, methylenecyclopropene is named after cyclopropene.
The methylene group should be distinguished from the compound methylene, also called carbene, whose molecule is a methylene group all by itself. This compound is usually denoted . The singlet excited isomer of the methylene compound is systematically called methylidene.
The names "methylene group" or "bridging methylene" are also used for the substituent --, that has the same composition as the methylene group but is connected by single bonds to two distinct atoms in the rest of the molecule. This unit may be better called "methylene bridge" or "methanediyl" to distinguish it from the doubly bonded methylene group. The distinction is often important, because the double bond is chemically different from two single bonds.
==See also ==

* Methylene
* Methyl group
* Methine
bs:Metilen
cs:Methylen
es:Metileno
fr:Méthylène
io:Metileno
id:Metilena
it:Metilene
he:מתילן
hu:Metilén
ja:メチレン基
pt:Metileno
ru:Метилен
zh:亚甲基

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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