methylene

A bivalent hydrocarbon group, CH₂, a component of unsaturated hydrocarbons.

A bivalent hydrocarbon radical (CH₂) which does not exist free, but occurs in many compounds, as methylene iodide, CH₂I₂. Also called methene.

A divalent hydrocarbon radical, -CH2-, not known in the free state, but regarded as an essential residue and component of certain derivatives of methane; ; — formerly called also methene.

an artificial dyestuff consisting of a complex sulphur derivative of diphenyl amine; — called also pure blue.

The divalent radical CH2< in which the free valencies are part of single bonds.

The same group, present as a repeating unit, in aliphatic compounds with names such as hexamethylenediamine.

The unstable carbene CH2:

the bivalent radical CH2 derived from methane