Methylene (compound)
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This article is about the compound. For the functional group, see Methylene group.
For other uses, see Methylene (disambiguation).
Methylene (IUPAC name: Methylidene, also called carbene or methene) is an organic compound with the chemical formula CH
2 (also written [CH
2]). It is a colourless gas that fluoresces in the mid-infrared range, and only persists in dilution, or as an adduct.
Quick Facts Names, Identifiers ...
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Names | |||
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IUPAC name
Dihydridocarbon(2•)[1] | |||
Preferred IUPAC name
Methylidene[2] | |||
Other names | |||
Identifiers | |||
3D model (JSmol) |
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1696832 | |||
ChEBI | |||
ChemSpider |
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56 | |||
MeSH | carbene | ||
PubChem CID |
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CompTox Dashboard (EPA) |
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Properties | |||
CH 22• | |||
Molar mass | 14.0266 g mol−1 | ||
Appearance | Colourless gas | ||
Reacts | |||
Conjugate acid | Methenium | ||
Thermochemistry | |||
Std molar entropy (S⦵298) |
193.93 J K−1 mol−1 | ||
Std enthalpy of formation (ΔfH⦵298) |
386.39 kJ mol−1 | ||
Related compounds | |||
Related compounds |
Methyl (CH3) Methylidyne (CH) Carbide (C) Silylene (SiH2) | ||
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Close
Methylene is the simplest carbene.[3]: p.7 [4] It is usually detected only at very low temperatures, or as a short-lived intermediate in chemical reactions.[5]