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.
In organic chemistry, a methinegroup or methine bridge is a trivalent functional group =CH−, derived formally from methane. It consists of a carbon atom...
an electron donor D. Structural of methine dyes Methine dyes comprise an odd number of methinegroups. The end groups can also be part of a heterocycle...
radical (a carbyne); CH• (or •CH), CH3• (or ⫶CH) The methylidyne group ≡CH The methinegroup (methanylylidene, methylylidene) =CH− Chomsky hierarchy, in computer...
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deprotonated to form a methylene group. Methylidene group Carbene Methylene (compound) Methyl groupMethine "methylene (preferred IUPAC name" (PDF). "methylidene...
number of methinegroups (CH) bound together by alternating single and double bonds. Compounds made up from an even number of methinegroups are known...
replacement of the methanone linking group with an ethanone, carboxamide, carboxylate, methylene bridge or methinegroup; (iv) replacement of the 1-naphthyl...
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geometry with the cyano group in cis orientation with respect to the cyclohexenyl methinegroup and anti-parallel to the methine proton. With other ligands...
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replacement of the methanone linking group with an ethanone, carboxamide, carboxylate, methylene bridge or methinegroup; replacement of the 1-naphthyl ring...