methylene

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methylene

A scientist draws the methylene group on a whiteboard.

Definition
  1. Noun:
    • The bivalent radical CH₂ derived from methane: In chemistry, "methylene" refers to a specific chemical group consisting of one carbon atom bonded to two hydrogen atoms, with two remaining bonds available to attach to other atoms or groups. It is a fundamental building block in organic chemistry.
Usage Examples
  • Noun:
    • The compound contains a reactive methylene group.
    • Methylene blue is a common dye and medication, though its name refers to a more complex derivative.
    • The chemist discussed the insertion of a methylene bridge between the two aromatic rings.
Advanced Usage

  • "Active methylene group": A methylene group (CH₂) that is flanked by two electron-withdrawing groups (like carbonyls), making the hydrogen atoms on it more acidic and reactive.

    • Compounds with an active methylene group are important intermediates in organic synthesis.

  • "Methylene bridge" or "Methylene linkage": A -CH₂- unit that connects two other parts of a molecule.

    • The polymer's flexibility is increased by the methylene bridges in its chain.
Variants and Related Words

  • Methyl (n): The univalent radical CH₃-, derived from methane.

    • A methyl group is often added or removed in biochemical reactions.

  • Methylate (v): To introduce a methyl group into a compound.

    • Scientists methylate the DNA to study gene expression.

  • Polymethylene (n): A polymer consisting of repeating methylene units; a term sometimes used for certain types of polyethylene.

    • Polymethylene is a simple hydrocarbon polymer.
Synonyms
  • Methylene group: The specific chemical unit.
  • Carbene (in a specific context): Refers to the divalent species :CH₂, which is the reactive cousin of the methylene group found in molecules. Note: "Carbene" is a highly reactive intermediate, while "methylene" in a stable compound refers to the -CH₂- unit.
Related Phrases and Terms

  • Methylene chloride: Common name for dichloromethane (CH₂Cl₂), an organic solvent.

    • Methylene chloride is often used as a paint stripper.

  • Methylene blue: A heterocyclic aromatic compound used as a dye, stain, and medication.

    • The biologist used methylene blue to stain the tissue sample.
methylene

A scientist draws the methylene group on a whiteboard.

Noun
  1. the bivalent radical CH2 derived from methane

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