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Methine group information


Methine or methylylidene (IUPAC)

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]

  1. ^ "Methanylylidene group". Chemical Entities of Biological Interest (ChEBI) database. 2007. Retrieved 2015-03-05.
  2. ^ (2007) Methanetriyl group in the Chemical Entities of Biological Interest (ChEBI) database. Accessed on 2015-03-05.

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Methine group

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an electron donor D. Structural of methine dyes Methine dyes comprise an odd number of methine groups. The end groups can also be part of a heterocycle...

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CH

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chemical formula C5H5N. It is structurally related to benzene, with one methine group (=CH−) replaced by a nitrogen atom (=N−). It is a highly flammable,...

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deprotonated to form a methylene group. Methylidene group Carbene Methylene (compound) Methyl group Methine "methylene (preferred IUPAC name" (PDF). "methylidene...

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Polymethine

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number of methine groups (CH) bound together by alternating single and double bonds. Compounds made up from an even number of methine groups are known...

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Alkyl group

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Methylidyne group

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Functional group

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functional group is a substituent or moiety in a molecule that causes the molecule's characteristic chemical reactions. The same functional group will undergo...

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Ethyl group

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Hexazine

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Hydroxy group

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Bullvalene

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is a cyclopropane platform with three vinylene arms conjoined at a methine group. This arrangement enables a degenerate Cope rearrangement with the result...

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Barrelene

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barrel, with the staves being three ethylene units attached to two methine groups. It is the formal Diels–Alder adduct of benzene and acetylene. Due to...

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Organocopper chemistry

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geometry with the cyano group in cis orientation with respect to the cyclohexenyl methine group and anti-parallel to the methine proton. With other ligands...

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Kalkitoxin

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hydrogen. The four methyl groups (each at a methine chiral center), the structure's overall stereochemistry, and the N-methyl group all contribute to the...

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Phenyl group

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group, or phenyl ring, is a cyclic group of atoms with the formula C6H5, and is often represented by the symbol Ph (archaically φ). The phenyl group is...

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