Something group
The methine group ( CH ) is a functional group from the field of organic chemistry . It consists of a carbon atom to which a hydrogen atom is bonded and thus has one less hydrogen atom than the methylene group . The free valences are satisfied by three further substituents or by multiple bonds. The carbon atom of the methine group is a tertiary carbon atom. The substituents can in principle be both organic and inorganic . The term methine group includes the methanetriyl (R 3 CH, 1 ), methanylidene ( 2 ), methylidine ( 3 ) and metheno groups ( 4 ). The carbon atoms of aromatics , if they do not have a substituent, can also be regarded as methine groups, although there is no localized double bond .
The simplest compounds that formally contain a methine group include ethyne (C 2 H 2 ), propene (CH 3 -CH = CH 2 ) and isobutane (CH 3 -CH (CH 3 ) -CH 3 ). The group of polymethine dyes is also known. The methylidine group occurs, for example, bound to an N atom in (methylidine-λ 5 -azanyl) cyclopropane.
See also
- Methyl group (CH 3 )
- Methylene group (CH 2 )
Individual evidence
- ↑ Entry on methine. In: Römpp Online . Georg Thieme Verlag, accessed on September 23, 2014.
- ↑ Entry on (methylidyne-λ5-azanyl) cyclopropane in the ChemSpider database of the Royal Society of Chemistry , accessed on January 22, 2014.