Methine


Methine
Methine or methylylidene (IUPAC)

In chemistry, methine (also known as methylidyne or methyne) is a trivalent functional group CH, derived formally from methane. The methine group consists of a carbon atom bound by two single bonds and one double bond, where one of the single bonds is to a hydrogen. This can also encompass subunits of an aromatic compound, although these do not have discrete single and double bonds.

It is sometimes used non-systematically for a carbon with four single bonds, where one bond is to a hydrogen.

Systematically it should be named methylylidene.

Example

Methine chain.svg

Every carbon in this molecule is a methine carbon, except the two that are attached to the two nitrogens and not to any hydrogens, and the one attached to the nitrogen, which is attached to two hydrogens (far right). There is a five-carbon poly-methine chain in the center of this molecule.

See also


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Look at other dictionaries:

  • Methine — Méthine Méthine désigne en chimie un groupe fonctionnel tri valent dérivé du méthane correspondant à : une liaison covalente simple et une double (groupe =CH ) ou à 3 liaisons covalentes simples CH. / Voir aussi méthyle méthylène méthane …   Wikipédia en Français

  • Méthine — désigne en chimie un groupe fonctionnel tri valent dérivé du méthane correspondant à : une liaison covalente simple et une double (groupe =CH ) ou à 3 liaisons covalentes simples CH. / Voir aussi Méthylidyne CH (radical) Méthylène –CH2– ou… …   Wikipédia en Français

  • methine — metin statusas T sritis chemija apibrėžtis Grupė. formulė =CH– atitikmenys: angl. methine rus. метин …   Chemijos terminų aiškinamasis žodynas

  • methine — noun The tervalent functional group, CH=, having one single bond and one double bond …   Wiktionary

  • methine — meth·ine (methґīn) methylidyne …   Medical dictionary

  • methine — meth·ine …   English syllables

  • methine — ˈmeˌthēn, thə̇n noun ( s) Etymology: International Scientific Vocabulary meth + ine : methylidyne used especially in names of classes of cyanine dyes and other polymethine dyes …   Useful english dictionary

  • methine basic orange G — noun Usage: usually capitalized M&B&O : a basic dye see dye table I (under Basic Orange 21) …   Useful english dictionary

  • methine basic yellow 3G — noun Usage: usually capitalized M&B&Y : a basic dye see dye table I (under Basic Yellow 11) …   Useful english dictionary

  • Metino — En química, el grupo metino o metilidino es un grupo funcional trivalente, CH, derivado formalmente del metano. Consiste en un átomo de carbono enlazado con dos enlaces simples y un enlace doble, uno de ellos unido a un hidrógeno. En ocasiones, y …   Wikipedia Español


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