In organic chemistry, a methine group or methine bridge is a trivalent functional group =CH−, derived formally from methane. It consists of a carbon atom bound by two single bonds and one double bond, where one of the single bonds is to a hydrogen. The group is also called methyne or methene, but its IUPAC systematic name is methylylidene or methanylylidene.[1]
This group is sometimes called "methylidyne", however that name belongs properly to either the methylidyne group ≡CH (connected to the rest of the molecule by a triple bond) or to the methylidyne radical ⫶CH (the two atoms as a free molecule with dangling bonds).
The name "methine" is also widely used in non-systematic nomenclature for the methanetriyl group (IUPAC): a carbon atom with four single bonds, where one bond is to a hydrogen atom (>CH−).[2]
^"Methanylylidene group". Chemical Entities of Biological Interest (ChEBI) database. 2007. Retrieved 2015-03-05.
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(2007) Methanetriyl group in the Chemical Entities of Biological Interest (ChEBI) database. Accessed on 2015-03-05.
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