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Methylene is the chemical species, R2C:, named after methane
Methane

Methane is a chemical compound with the molecular formula . It is the simplest alkane, and the principal component of natural gas. Methane's bond angles are 109.5 degrees....
, in which two of the carbon atom's valence electrons form no bonds.






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Methylene Chloride
Methylenecyclopropene
Methylene is the chemical species, R2C:, named after methane
Methane

Methane is a chemical compound with the molecular formula . It is the simplest alkane, and the principal component of natural gas. Methane's bond angles are 109.5 degrees....
, in which two of the carbon atom's valence electrons form no bonds. The word is applicable to:
  • the -CH2- group present, for example, in dichloromethane
    Dichloromethane

    Dichloromethane or methylene chloride is the chemical compound with the chemical formula CarbonHydrogen2Chlorine2....
     (also known as methylene chloride),
  • the =CH2 group, which occurs in methylenecyclopropene
    Methylenecyclopropene

    3-Methylenecyclopropene is a hydrocarbon with chemical formula 44 and CAS number 4095-06-1. It dimerizes or polymerizes readily, but is more stable than cyclobutadiene....
    ,
  • and the :CH2 molecule, a carbene
    Carbene

    In chemistry, a carbene is a highly reactive organic molecule containing a carbon atom with six valence electrons and having the general formula: R1R2C: ....
     known as methylene. A carbene is a highly reactive organic molecule having a divalent
    Divalent

    In chemistry, divalent anions are atoms or radicals with 2 additional electrons when compared to their elemental state ; for instance, S2- is the sulfide anion....
     carbon
    Carbon

    Carbon is a chemical element with chemical symbol C and atomic number 6. As a member of group 14 on the periodic table, it is nonmetallic and tetravalence?making four electrons available to form covalent bond chemical bonds....
     atom with six valence
    Valence (chemistry)

    In chemistry, valence, also known as valency or valency number, is a measure of the number of chemical bonds formed by the atoms of a given chemical element....
     electrons.


Methylene groups in a chain or ring contribute to its size and lipophilicity.

See also

  • Methyl
  • Methylidyne