In organic chemistry, a methylidyne group or just methylidyne is a neutral part of a molecule (a substituent or functional group) with formula , consisting of a carbon atom bonded to a hydrogen atom by one single bond and to the rest of the molecule by one triple bond. (2013) Methylidyne group in the Chemical Entities of Biological Interest (ChEBI) database. Accessed on 2013-02-06. For example, a methylidyne group is present in n-methylidyne-1-hexanaminium, .
The name "methylidyne" is also used for the methylidyne radical (carbyne) , the same two atoms not bound to any other atom.
See also Methylene group or methylidene = Methylene bridge or methanediyl −− Methine group, methylylidene, or methanylylidene =CH− Methanetriyl group >CH− Methylylidyne group ≡C−
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