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|Section2= |Section3= |Section8= }} Methylene (systematically named methylidene, and dihydridocarbon), also called carbene is an organic compound with the chemical formula (also written ). It is a colourless gas that fluoresces in the mid-infrared range, and only persists in dilution, or as an adduct. Methylene is the simplest carbene.〔Roald Hoffman (2005), ''Molecular Orbitals of Transition Metal Complexes''. Oxford. ISBN 0-19-853093-5〕 It is usually detected only at very low pressures, very low temperatures, or as a short-lived intermediate in chemical reactions.〔 W. B. DeMore and S. W. Benson (1964), ''(Preparation, properties, and reactivity of methylene )''. In ''Advances in Photochemistry'', John Wiley & Sons, 453 pages. ISBN 0470133597 〕 == Nomenclature == The trivial name ''carbene'' is the preferred IUPAC name. The systematic names ''methylidene'' and ''dihydridocarbon'', valid IUPAC names, are constructed according to the substitutive and additive nomenclatures, respectively. ''Methylidene'' is viewed as methane with two hydrogen atoms removed. By default, this name pays no regard to the radicality of the methylene. Although in a context where the radicality is considered, it can also name the non-radical excited state, whereas the radical ground state with two unpaired electrons is named ''methanediyl''. ''Methylene'' is also used as the trivial name for the substituent groups ''methanediyl'' (), and ''methylidene'' (). ''Methylene'' has an electron affinity of 0.65 eV 〔http://webbook.nist.gov/cgi/cbook.cgi?ID=C2465567&Units=SI&Mask=20#Ion-Energetics〕 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「Methylene (compound)」の詳細全文を読む スポンサード リンク
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