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methylene group wikipedia jump to content main menu main menu move to sidebar hide navigation main page contents current events random article about wikipedia contact us contribute help learn to edit community portal recent changes upload file special pages search search appearance donate create account log in personal tools donate create account log in contents move to sidebar hide top 1 activated methylene 2 see also 3 references toggle the table of contents methylene group 19 languages العربية বাংলা čeština deutsch ελληνικά español فارسی bahasa indonesia 日本語 한국어 ligure nederlands polski русский simple english slovenčina தமிழ் українська tiếng việt edit links article talk english read edit view history tools tools move to sidebar hide actions read edit view history general what links here related changes upload file permanent link page information cite this page get shortened url switch to legacy parser print export download as pdf printable version in other projects wikimedia commons wikidata item appearance move to sidebar hide from wikipedia the free encyclopedia this article is about the functional group for the compound see methylene compound chemical group ch2 the hexamethylenediamine molecule contains six methylene groups in this case also called methylene bridges 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 two single bonds 1 the group may be represented as ch 2 or ch 2 where the denotes the two bonds this stands in contrast to a situation where the carbon atom is bound to the rest of the molecule by a double bond which is preferably called a methylidene group represented ch 2 2 formerly the methylene name was used for both isomers the name methylene bridge can be used for the single bonded isomer to emphatically exclude methylidene the distinction is often important because the double bond is chemically different from two single bonds the methylene group should be distinguished from the ch 2 molecule called carbene 3 this was also formerly called methylene activated methylene edit acidity of diethyl malonate a 1 3 dicarbonyl compound the central carbon in 1 3 dicarbonyl compound is known as an activated methylene group this is because owing to the structure the carbon is especially acidic and can easily be deprotonated to form a methylene group 4 see also edit carbene methyl group methine references edit methylene preferred iupac name pdf methylidene preferred iupac name pdf iupac compendium of chemical terminology 5th ed the gold book 2025 online version 2006 carbenes doi 10 1351 goldbook c00806 active methylenes v t e functional groups hydrocarbons only c and h alkyl methyl ethyl propyl cyclopropyl butyl pentyl methylene bridge methine alkene vinyl allyl 1 propenyl crotyl allene cumulene aryl phenyl benzyl alkyne carbene only carbon hydrogen and oxygen only c h and o r o r acetal alcohol alkoxy methoxy ether enol ether epoxide peroxy hydroperoxy dioxiranes ethylenedioxy methylenedioxy carbonyl acyl acetyl acryloyl benzoyl aldehyde ketene ketone ynone reductone carboxy carboxyl acetoxy anhydride ester orthoester only one element not being carbon hydrogen or oxygen one element not c h or o nitrogen amine enamine ammonium hydrazo nitrene imine oxime hydrazone azo amide imidate amidine carbamate imide nitrile isonitrile cyanate isocyanate nitrate nitrite nitro nitroso nonoate triazole tetrazole silicon silane hydrosilane chlorosilane silene silanol siloxide siloxane silanone silether silole silatrane silicate phosphorus phosphate phosphodiester phosphonate phosphite phosphonous phosphinate phosphine oxide phosphine phosphonium phosphaalkene phosphaalkyne phosphaallene arsenic arsinic acid arsonic acid arsole sulfur thiol thioether sulfonium thia crown ether persulfide disulfide sulfenic acid thiosulfinate sulfoxide thiosulfonate sulfinic acid sulfone sulfonic acid thioketone thial thioester thionoester thioxanthate xanthate boron boronic acid borinic acid selenium selenol selenonic acid seleninic acid selenenic acid selone selenoether tellurium tellurol telluroketone telluroether polonium polonol polonoether halo haloalkane fluoroethyl trifluoromethyl trichloromethyl trifluoromethoxy hypervalent iodine vinyl halide iodide acyl halide chloride perchlorate other isothiocyanate phosphoramides sulfenyl chloride sulfonamide thiocyanate sulfinylamines see also chemical classification chemical nomenclature inorganic organic this organic chemistry article is a stub you can help wikipedia by adding missing information v t e retrieved from https en wikipedia org w index php title methylene_group oldid 1364506166 categories alkanediyl groups organic chemistry stubs hidden categories articles with short description short description is different from wikidata all stub articles this page was last edited on 16 july 2026 at 23 52 utc page was rendered with parsoid text is available 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