Methine group: Difference between revisions
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</ref> |
</ref> |
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==Overlapping methines== |
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Two or more methine bridges can overlap, forming a chain or ring of carbon atoms connected by alternating single and double bonds, as in [[piperylene]] {{chem2|H2C\dCH\sCH\dCH\sCH3}}, or the compound |
|||
[[Image:Methine chain.svg|300px|center]] |
|||
Every carbon in this molecule is a methine carbon, except for three; two that are attached to the two [[nitrogen]]s 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. |
|||
Chains of alternating single and double bonds often form [[conjugated system]]s. When closed, as in [[benzene]] {{chem2|(\dCH\sCH\d)3}}, they often give [[aromatic (chemistry)|aromatic]] character to the compound. |
|||
==See also== |
|||
* [[Methyl group]] −{{chem|CH|3}} |
|||
* [[Methylene group]] or methylidene ={{chem|CH|2}} |
|||
* [[Methylene bridge]] or methanediyl −{{chem|CH|2}}− |
|||
* [[Methanetriyl group]] >CH− |
|||
* [[Methylylidyne group]] ≡C− |
|||
==References== |
|||
{{reflist}} |
|||
[[Category:Functional groups]] |
|||
[[Category:Substituents]] |
|||
{{Functional Groups}} |
|||
[[Image:Methine.svg|100px|right|thumb|Methine or methylylidene (IUPAC)]] |
|||
In 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 [[covalent bond|bond]]s and one double bond, where one of the single bonds is to a [[hydrogen]]. The group is also called '''methyne''' or '''methene'''; its [[International Union of Pure and Applied Chemistry|IUPAC systematic name]] is '''methylylidene''' or '''methanylylidene'''<ref name=chebi> |
|||
(2007) [http://www.ebi.ac.uk/chebi/searchId.do;459B480BAF25AAC3CD9F2B5C3C3A9A07?chebiId=CHEBI:29432 ''Methanylylidene group''] in the Chemical Entities of Biological Interest (ChEBI) database. Accessed on 2015-03-05. |
|||
</ref> |
|||
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 with four single [[covalent bond|bonds]], where one bond is to a [[hydrogen]] (>CH−).<ref name=chebi_2> |
|||
(2007) [http://www.ebi.ac.uk/chebi/searchId.do;58A938AD0980FE8C9FAC6FF7D03B7F51?chebiId=CHEBI:29433 ''Methanetriyl group''] in the Chemical Entities of Biological Interest (ChEBI) database. Accessed on 2015-03-05. |
|||
</ref> |
|||
==Overlapping methines== |
|||
Two or more methine bridges can overlap, forming a chain or ring of carbon atoms connected by alternating single and double bonds, as in [[piperylene]] {{chem2|H2C\dCH\sCH\dCH\sCH3}}, or the compound |
|||
[[Image:Methine chain.svg|300px|center]] |
|||
Every carbon in this molecule is a methine carbon, except for three; two that are attached to the two [[nitrogen]]s 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. |
|||
Chains of alternating single and double bonds often form [[conjugated system]]s. When closed, as in [[benzene]] {{chem2|(\dCH\sCH\d)3}}, they often give [[aromatic (chemistry)|aromatic]] character to the compound. |
Chains of alternating single and double bonds often form [[conjugated system]]s. When closed, as in [[benzene]] {{chem2|(\dCH\sCH\d)3}}, they often give [[aromatic (chemistry)|aromatic]] character to the compound. |
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(2007) [http://www.ebi.ac.uk/chebi/searchId.do;58A938AD0980FE8C9FAC6FF7D03B7F51?chebiId=CHEBI:29433 ''Methanetriyl group''] in the Chemical Entities of Biological Interest (ChEBI) database. Accessed on 2015-03-05. |
(2007) [http://www.ebi.ac.uk/chebi/searchId.do;58A938AD0980FE8C9FAC6FF7D03B7F51?chebiId=CHEBI:29433 ''Methanetriyl group''] in the Chemical Entities of Biological Interest (ChEBI) database. Accessed on 2015-03-05. |
||
</ref> |
</ref> |
||
==Overlapping methines== |
|||
Two or more methine bridges can overlap, forming a chain or ring of carbon atoms connected by alternating single and double bonds, as in [[piperylene]] {{chem2|H2C\dCH\sCH\dCH\sCH3}}, or the compound |
|||
[[Image:Methine chain.svg|300px|center]] |
|||
Every carbon in this molecule is a methine carbon, except for three; two that are attached to the two [[nitrogen]]s 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. |
|||
Chains of alternating single and double bonds often form [[conjugated system]]s. When closed, as in [[benzene]] {{chem2|(\dCH\sCH\d)3}}, they often give [[aromatic (chemistry)|aromatic]] character to the compound. |
|||
==See also== |
|||
* [[Methyl group]] −{{chem|CH|3}} |
|||
* [[Methylene group]] or methylidene ={{chem|CH|2}} |
|||
* [[Methylene bridge]] or methanediyl −{{chem|CH|2}}− |
|||
* [[Methanetriyl group]] >CH− |
|||
* [[Methylylidyne group]] ≡C− |
|||
==References== |
|||
{{reflist}} |
|||
[[Category:Functional groups]] |
|||
[[Category:Substituents]] |
|||
{{Functional Groups}} |
|||
[[Image:Methine.svg|100px|right|thumb|Methine or methylylidene (IUPAC)]] |
|||
In 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 [[covalent bond|bond]]s and one double bond, where one of the single bonds is to a [[hydrogen]]. The group is also called '''methyne''' or '''methene'''; its [[International Union of Pure and Applied Chemistry|IUPAC systematic name]] is '''methylylidene''' or '''methanylylidene'''<ref name=chebi> |
|||
(2007) [http://www.ebi.ac.uk/chebi/searchId.do;459B480BAF25AAC3CD9F2B5C3C3A9A07?chebiId=CHEBI:29432 ''Methanylylidene group''] in the Chemical Entities of Biological Interest (ChEBI) database. Accessed on 2015-03-05. |
|||
</ref> |
|||
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 with four single [[covalent bond|bonds]], where one bond is to a [[hydrogen]] (>CH−).<ref name=chebi_2> |
|||
(2007) [http://www.ebi.ac.uk/chebi/searchId.do;58A938AD0980FE8C9FAC6FF7D03B7F51?chebiId=CHEBI:29433 ''Methanetriyl group''] in the Chemical Entities of Biological Interest (ChEBI) database. Accessed on 2015-03-05. |
|||
</ref> |
|||
==Overlapping methines== |
|||
Two or more methine bridges can overlap, forming a chain or ring of carbon atoms connected by alternating single and double bonds, as in [[piperylene]] {{chem2|H2C\dCH\sCH\dCH\sCH3}}, or the compound |
|||
[[Image:Methine chain.svg|300px|center]] |
|||
Every carbon in this molecule is a methine carbon, except for three; two that are attached to the two [[nitrogen]]s 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. |
|||
Chains of alternating single and double bonds often form [[conjugated system]]s. When closed, as in [[benzene]] {{chem2|(\dCH\sCH\d)3}}, they often give [[aromatic (chemistry)|aromatic]] character to the compound. |
|||
==See also== |
|||
* [[Methyl group]] −{{chem|CH|3}} |
|||
* [[Methylene group]] or methylidene ={{chem|CH|2}} |
|||
* [[Methylene bridge]] or methanediyl −{{chem|CH|2}}− |
|||
* [[Methanetriyl group]] >CH− |
|||
* [[Methylylidyne group]] ≡C− |
|||
==References== |
|||
{{reflist}} |
|||
[[Category:Functional groups]] |
|||
[[Category:Substituents]] |
|||
{{Functional Groups}} |
|||
[[Image:Methine.svg|100px|right|thumb|Methine or methylylidene (IUPAC)]] |
|||
In 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 [[covalent bond|bond]]s and one double bond, where one of the single bonds is to a [[hydrogen]]. The group is also called '''methyne''' or '''methene'''; its [[International Union of Pure and Applied Chemistry|IUPAC systematic name]] is '''methylylidene''' or '''methanylylidene'''<ref name=chebi> |
|||
(2007) [http://www.ebi.ac.uk/chebi/searchId.do;459B480BAF25AAC3CD9F2B5C3C3A9A07?chebiId=CHEBI:29432 ''Methanylylidene group''] in the Chemical Entities of Biological Interest (ChEBI) database. Accessed on 2015-03-05. |
|||
</ref> |
|||
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 with four single [[covalent bond|bonds]], where one bond is to a [[hydrogen]] (>CH−).<ref name=chebi_2> |
|||
(2007) [http://www.ebi.ac.uk/chebi/searchId.do;58A938AD0980FE8C9FAC6FF7D03B7F51?chebiId=CHEBI:29433 ''Methanetriyl group''] in the Chemical Entities of Biological Interest (ChEBI) database. Accessed on 2015-03-05. |
|||
</ref> |
|||
==Overlapping methines== |
|||
Two or more methine bridges can overlap, forming a chain or ring of carbon atoms connected by alternating single and double bonds, as in [[piperylene]] {{chem2|H2C\dCH\sCH\dCH\sCH3}}, or the compound |
|||
[[Image:Methine chain.svg|300px|center]] |
|||
Every carbon in this molecule is a methine carbon, except for three; two that are attached to the two [[nitrogen]]s 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. |
|||
Chains of alternating single and double bonds often form [[conjugated system]]s. When closed, as in [[benzene]] {{chem2|(\dCH\sCH\d)3}}, they often give [[aromatic (chemistry)|aromatic]] character to the compound. |
|||
==See also== |
|||
* [[Methyl group]] −{{chem|CH|3}} |
|||
* [[Methylene group]] or methylidene ={{chem|CH|2}} |
|||
* [[Methylene bridge]] or methanediyl −{{chem|CH|2}}− |
|||
* [[Methanetriyl group]] >CH− |
|||
* [[Methylylidyne group]] ≡C− |
|||
==References== |
|||
{{reflist}} |
|||
[[Category:Functional groups]] |
|||
[[Category:Substituents]] |
|||
{{Functional Groups}} |
|||
[[Image:Methine.svg|100px|right|thumb|Methine or methylylidene (IUPAC)]] |
|||
In 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 [[covalent bond|bond]]s and one double bond, where one of the single bonds is to a [[hydrogen]]. The group is also called '''methyne''' or '''methene'''; its [[International Union of Pure and Applied Chemistry|IUPAC systematic name]] is '''methylylidene''' or '''methanylylidene'''<ref name=chebi> |
|||
(2007) [http://www.ebi.ac.uk/chebi/searchId.do;459B480BAF25AAC3CD9F2B5C3C3A9A07?chebiId=CHEBI:29432 ''Methanylylidene group''] in the Chemical Entities of Biological Interest (ChEBI) database. Accessed on 2015-03-05. |
|||
</ref> |
|||
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 with four single [[covalent bond|bonds]], where one bond is to a [[hydrogen]] (>CH−).<ref name=chebi_2> |
|||
(2007) [http://www.ebi.ac.uk/chebi/searchId.do;58A938AD0980FE8C9FAC6FF7D03B7F51?chebiId=CHEBI:29433 ''Methanetriyl group''] in the Chemical Entities of Biological Interest (ChEBI) database. Accessed on 2015-03-05. |
|||
</ref> |
|||
==Overlapping methines== |
|||
Two or more methine bridges can overlap, forming a chain or ring of carbon atoms connected by alternating single and double bonds, as in [[piperylene]] {{chem2|H2C\dCH\sCH\dCH\sCH3}}, or the compound |
|||
[[Image:Methine chain.svg|300px|center]] |
|||
Every carbon in this molecule is a methine carbon, except for three; two that are attached to the two [[nitrogen]]s 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. |
|||
Chains of alternating single and double bonds often form [[conjugated system]]s. When closed, as in [[benzene]] {{chem2|(\dCH\sCH\d)3}}, they often give [[aromatic (chemistry)|aromatic]] character to the compound. |
|||
==See also== |
|||
* [[Methyl group]] −{{chem|CH|3}} |
|||
* [[Methylene group]] or methylidene ={{chem|CH|2}} |
|||
* [[Methylene bridge]] or methanediyl −{{chem|CH|2}}− |
|||
* [[Methanetriyl group]] >CH− |
|||
* [[Methylylidyne group]] ≡C− |
|||
==References== |
|||
{{reflist}} |
|||
[[Category:Functional groups]] |
|||
[[Category:Substituents]] |
|||
{{Functional Groups}} |
|||
[[Image:Methine.svg|100px|right|thumb|Methine or methylylidene (IUPAC)]] |
|||
In 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 [[covalent bond|bond]]s and one double bond, where one of the single bonds is to a [[hydrogen]]. The group is also called '''methyne''' or '''methene'''; its [[International Union of Pure and Applied Chemistry|IUPAC systematic name]] is '''methylylidene''' or '''methanylylidene'''<ref name=chebi> |
|||
(2007) [http://www.ebi.ac.uk/chebi/searchId.do;459B480BAF25AAC3CD9F2B5C3C3A9A07?chebiId=CHEBI:29432 ''Methanylylidene group''] in the Chemical Entities of Biological Interest (ChEBI) database. Accessed on 2015-03-05. |
|||
</ref> |
|||
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 with four single [[covalent bond|bonds]], where one bond is to a [[hydrogen]] (>CH−).<ref name=chebi_2> |
|||
(2007) [http://www.ebi.ac.uk/chebi/searchId.do;58A938AD0980FE8C9FAC6FF7D03B7F51?chebiId=CHEBI:29433 ''Methanetriyl group''] in the Chemical Entities of Biological Interest (ChEBI) database. Accessed on 2015-03-05. |
|||
</ref> |
|||
==Overlapping methines== |
|||
Two or more methine bridges can overlap, forming a chain or ring of carbon atoms connected by alternating single and double bonds, as in [[piperylene]] {{chem2|H2C\dCH\sCH\dCH\sCH3}}, or the compound |
|||
[[Image:Methine chain.svg|300px|center]] |
|||
Every carbon in this molecule is a methine carbon, except for three; two that are attached to the two [[nitrogen]]s 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. |
|||
Chains of alternating single and double bonds often form [[conjugated system]]s. When closed, as in [[benzene]] {{chem2|(\dCH\sCH\d)3}}, they often give [[aromatic (chemistry)|aromatic]] character to the compound. |
|||
==See also== |
|||
* [[Methyl group]] −{{chem|CH|3}} |
|||
* [[Methylene group]] or methylidene ={{chem|CH|2}} |
|||
* [[Methylene bridge]] or methanediyl −{{chem|CH|2}}− |
|||
* [[Methanetriyl group]] >CH− |
|||
* [[Methylylidyne group]] ≡C− |
|||
==References== |
|||
{{reflist}} |
|||
[[Category:Functional groups]] |
|||
[[Category:Substituents]] |
|||
{{Functional Groups}} |
|||
[[Image:Methine.svg|100px|right|thumb|Methine or methylylidene (IUPAC)]] |
|||
In 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 [[covalent bond|bond]]s and one double bond, where one of the single bonds is to a [[hydrogen]]. The group is also called '''methyne''' or '''methene'''; its [[International Union of Pure and Applied Chemistry|IUPAC systematic name]] is '''methylylidene''' or '''methanylylidene'''<ref name=chebi> |
|||
(2007) [http://www.ebi.ac.uk/chebi/searchId.do;459B480BAF25AAC3CD9F2B5C3C3A9A07?chebiId=CHEBI:29432 ''Methanylylidene group''] in the Chemical Entities of Biological Interest (ChEBI) database. Accessed on 2015-03-05. |
|||
</ref> |
|||
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 with four single [[covalent bond|bonds]], where one bond is to a [[hydrogen]] (>CH−).<ref name=chebi_2> |
|||
(2007) [http://www.ebi.ac.uk/chebi/searchId.do;58A938AD0980FE8C9FAC6FF7D03B7F51?chebiId=CHEBI:29433 ''Methanetriyl group''] in the Chemical Entities of Biological Interest (ChEBI) database. Accessed on 2015-03-05. |
|||
</ref> |
|||
==Overlapping methines== |
|||
Two or more methine bridges can overlap, forming a chain or ring of carbon atoms connected by alternating single and double bonds, as in [[piperylene]] {{chem2|H2C\dCH\sCH\dCH\sCH3}}, or the compound |
|||
[[Image:Methine chain.svg|300px|center]] |
|||
Every carbon in this molecule is a methine carbon, except for three; two that are attached to the two [[nitrogen]]s 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. |
|||
Chains of alternating single and double bonds often form [[conjugated system]]s. When closed, as in [[benzene]] {{chem2|(\dCH\sCH\d)3}}, they often give [[aromatic (chemistry)|aromatic]] character to the compound. |
|||
==See also== |
|||
* [[Methyl group]] −{{chem|CH|3}} |
|||
* [[Methylene group]] or methylidene ={{chem|CH|2}} |
|||
* [[Methylene bridge]] or methanediyl −{{chem|CH|2}}− |
|||
* [[Methanetriyl group]] >CH− |
|||
* [[Methylylidyne group]] ≡C− |
|||
==References== |
|||
{{reflist}} |
|||
[[Category:Functional groups]] |
|||
[[Category:Substituents]] |
|||
{{Functional Groups}} |
|||
[[Image:Methine.svg|100px|right|thumb|Methine or methylylidene (IUPAC)]] |
|||
In 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 [[covalent bond|bond]]s and one double bond, where one of the single bonds is to a [[hydrogen]]. The group is also called '''methyne''' or '''methene'''; its [[International Union of Pure and Applied Chemistry|IUPAC systematic name]] is '''methylylidene''' or '''methanylylidene'''<ref name=chebi> |
|||
(2007) [http://www.ebi.ac.uk/chebi/searchId.do;459B480BAF25AAC3CD9F2B5C3C3A9A07?chebiId=CHEBI:29432 ''Methanylylidene group''] in the Chemical Entities of Biological Interest (ChEBI) database. Accessed on 2015-03-05. |
|||
</ref> |
|||
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 with four single [[covalent bond|bonds]], where one bond is to a [[hydrogen]] (>CH−).<ref name=chebi_2> |
|||
(2007) [http://www.ebi.ac.uk/chebi/searchId.do;58A938AD0980FE8C9FAC6FF7D03B7F51?chebiId=CHEBI:29433 ''Methanetriyl group''] in the Chemical Entities of Biological Interest (ChEBI) database. Accessed on 2015-03-05. |
|||
</ref> |
|||
==Overlapping methines== |
|||
Two or more methine bridges can overlap, forming a chain or ring of carbon atoms connected by alternating single and double bonds, as in [[piperylene]] {{chem2|H2C\dCH\sCH\dCH\sCH3}}, or the compound |
|||
[[Image:Methine chain.svg|300px|center]] |
|||
Every carbon in this molecule is a methine carbon, except for three; two that are attached to the two [[nitrogen]]s 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. |
|||
Chains of alternating single and double bonds often form [[conjugated system]]s. When closed, as in [[benzene]] {{chem2|(\dCH\sCH\d)3}}, they often give [[aromatic (chemistry)|aromatic]] character to the compound. |
|||
==See also== |
|||
* [[Methyl group]] −{{chem|CH|3}} |
|||
* [[Methylene group]] or methylidene ={{chem|CH|2}} |
|||
* [[Methylene bridge]] or methanediyl −{{chem|CH|2}}− |
|||
* [[Methanetriyl group]] >CH− |
|||
* [[Methylylidyne group]] ≡C− |
|||
==References== |
|||
{{reflist}} |
|||
[[Category:Functional groups]] |
|||
[[Category:Substituents]] |
|||
{{Functional Groups}} |
|||
[[Image:Methine.svg|100px|right|thumb|Methine or methylylidene (IUPAC)]] |
|||
In 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 [[covalent bond|bond]]s and one double bond, where one of the single bonds is to a [[hydrogen]]. The group is also called '''methyne''' or '''methene'''; its [[International Union of Pure and Applied Chemistry|IUPAC systematic name]] is '''methylylidene''' or '''methanylylidene'''<ref name=chebi> |
|||
(2007) [http://www.ebi.ac.uk/chebi/searchId.do;459B480BAF25AAC3CD9F2B5C3C3A9A07?chebiId=CHEBI:29432 ''Methanylylidene group''] in the Chemical Entities of Biological Interest (ChEBI) database. Accessed on 2015-03-05. |
|||
</ref> |
|||
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 with four single [[covalent bond|bonds]], where one bond is to a [[hydrogen]] (>CH−).<ref name=chebi_2> |
|||
(2007) [http://www.ebi.ac.uk/chebi/searchId.do;58A938AD0980FE8C9FAC6FF7D03B7F51?chebiId=CHEBI:29433 ''Methanetriyl group''] in the Chemical Entities of Biological Interest (ChEBI) database. Accessed on 2015-03-05. |
|||
</ref> |
|||
==Overlapping methines== |
|||
Two or more methine bridges can overlap, forming a chain or ring of carbon atoms connected by alternating single and double bonds, as in [[piperylene]] {{chem2|H2C\dCH\sCH\dCH\sCH3}}, or the compound |
|||
[[Image:Methine chain.svg|300px|center]] |
|||
Every carbon in this molecule is a methine carbon, except for three; two that are attached to the two [[nitrogen]]s 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. |
|||
Chains of alternating single and double bonds often form [[conjugated system]]s. When closed, as in [[benzene]] {{chem2|(\dCH\sCH\d)3}}, they often give [[aromatic (chemistry)|aromatic]] character to the compound. |
|||
==See also== |
|||
* [[Methyl group]] −{{chem|CH|3}} |
|||
* [[Methylene group]] or methylidene ={{chem|CH|2}} |
|||
* [[Methylene bridge]] or methanediyl −{{chem|CH|2}}− |
|||
* [[Methanetriyl group]] >CH− |
|||
* [[Methylylidyne group]] ≡C− |
|||
==References== |
|||
{{reflist}} |
|||
[[Category:Functional groups]] |
|||
[[Category:Substituents]] |
|||
{{Functional Groups}} |
|||
[[Image:Methine.svg|100px|right|thumb|Methine or methylylidene (IUPAC)]] |
|||
In 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 [[covalent bond|bond]]s and one double bond, where one of the single bonds is to a [[hydrogen]]. The group is also called '''methyne''' or '''methene'''; its [[International Union of Pure and Applied Chemistry|IUPAC systematic name]] is '''methylylidene''' or '''methanylylidene'''<ref name=chebi> |
|||
(2007) [http://www.ebi.ac.uk/chebi/searchId.do;459B480BAF25AAC3CD9F2B5C3C3A9A07?chebiId=CHEBI:29432 ''Methanylylidene group''] in the Chemical Entities of Biological Interest (ChEBI) database. Accessed on 2015-03-05. |
|||
</ref> |
|||
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 with four single [[covalent bond|bonds]], where one bond is to a [[hydrogen]] (>CH−).<ref name=chebi_2> |
|||
(2007) [http://www.ebi.ac.uk/chebi/searchId.do;58A938AD0980FE8C9FAC6FF7D03B7F51?chebiId=CHEBI:29433 ''Methanetriyl group''] in the Chemical Entities of Biological Interest (ChEBI) database. Accessed on 2015-03-05. |
|||
</ref> |
|||
==Overlapping methines== |
|||
Two or more methine bridges can overlap, forming a chain or ring of carbon atoms connected by alternating single and double bonds, as in [[piperylene]] {{chem2|H2C\dCH\sCH\dCH\sCH3}}, or the compound |
|||
[[Image:Methine chain.svg|300px|center]] |
|||
Every carbon in this molecule is a methine carbon, except for three; two that are attached to the two [[nitrogen]]s 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. |
|||
Chains of alternating single and double bonds often form [[conjugated system]]s. When closed, as in [[benzene]] {{chem2|(\dCH\sCH\d)3}}, they often give [[aromatic (chemistry)|aromatic]] character to the compound. |
|||
==See also== |
|||
* [[Methyl group]] −{{chem|CH|3}} |
|||
* [[Methylene group]] or methylidene ={{chem|CH|2}} |
|||
* [[Methylene bridge]] or methanediyl −{{chem|CH|2}}− |
|||
* [[Methanetriyl group]] >CH− |
|||
* [[Methylylidyne group]] ≡C− |
|||
==References== |
|||
{{reflist}} |
|||
[[Category:Functional groups]] |
|||
[[Category:Substituents]] |
|||
{{Functional Groups}} |
|||
[[Image:Methine.svg|100px|right|thumb|Methine or methylylidene (IUPAC)]] |
|||
In 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 [[covalent bond|bond]]s and one double bond, where one of the single bonds is to a [[hydrogen]]. The group is also called '''methyne''' or '''methene'''; its [[International Union of Pure and Applied Chemistry|IUPAC systematic name]] is '''methylylidene''' or '''methanylylidene'''<ref name=chebi> |
|||
(2007) [http://www.ebi.ac.uk/chebi/searchId.do;459B480BAF25AAC3CD9F2B5C3C3A9A07?chebiId=CHEBI:29432 ''Methanylylidene group''] in the Chemical Entities of Biological Interest (ChEBI) database. Accessed on 2015-03-05. |
|||
</ref> |
|||
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 with four single [[covalent bond|bonds]], where one bond is to a [[hydrogen]] (>CH−).<ref name=chebi_2> |
|||
(2007) [http://www.ebi.ac.uk/chebi/searchId.do;58A938AD0980FE8C9FAC6FF7D03B7F51?chebiId=CHEBI:29433 ''Methanetriyl group''] in the Chemical Entities of Biological Interest (ChEBI) database. Accessed on 2015-03-05. |
|||
</ref> |
|||
==Overlapping methines== |
|||
Two or more methine bridges can overlap, forming a chain or ring of carbon atoms connected by alternating single and double bonds, as in [[piperylene]] {{chem2|H2C\dCH\sCH\dCH\sCH3}}, or the compound |
|||
[[Image:Methine chain.svg|300px|center]] |
|||
Every carbon in this molecule is a methine carbon, except for three; two that are attached to the two [[nitrogen]]s 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. |
|||
Chains of alternating single and double bonds often form [[conjugated system]]s. When closed, as in [[benzene]] {{chem2|(\dCH\sCH\d)3}}, they often give [[aromatic (chemistry)|aromatic]] character to the compound. |
|||
==See also== |
|||
* [[Methyl group]] −{{chem|CH|3}} |
|||
* [[Methylene group]] or methylidene ={{chem|CH|2}} |
|||
* [[Methylene bridge]] or methanediyl −{{chem|CH|2}}− |
|||
* [[Methanetriyl group]] >CH− |
|||
* [[Methylylidyne group]] ≡C− |
|||
==References== |
|||
{{reflist}} |
|||
[[Category:Functional groups]] |
|||
[[Category:Substituents]] |
|||
{{Functional Groups}} |
|||
[[Image:Methine.svg|100px|right|thumb|Methine or methylylidene (IUPAC)]] |
|||
In 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 [[covalent bond|bond]]s and one double bond, where one of the single bonds is to a [[hydrogen]]. The group is also called '''methyne''' or '''methene'''; its [[International Union of Pure and Applied Chemistry|IUPAC systematic name]] is '''methylylidene''' or '''methanylylidene'''<ref name=chebi> |
|||
(2007) [http://www.ebi.ac.uk/chebi/searchId.do;459B480BAF25AAC3CD9F2B5C3C3A9A07?chebiId=CHEBI:29432 ''Methanylylidene group''] in the Chemical Entities of Biological Interest (ChEBI) database. Accessed on 2015-03-05. |
|||
</ref> |
|||
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 with four single [[covalent bond|bonds]], where one bond is to a [[hydrogen]] (>CH−).<ref name=chebi_2> |
|||
(2007) [http://www.ebi.ac.uk/chebi/searchId.do;58A938AD0980FE8C9FAC6FF7D03B7F51?chebiId=CHEBI:29433 ''Methanetriyl group''] in the Chemical Entities of Biological Interest (ChEBI) database. Accessed on 2015-03-05. |
|||
</ref> |
|||
==Overlapping methines== |
|||
Two or more methine bridges can overlap, forming a chain or ring of carbon atoms connected by alternating single and double bonds, as in [[piperylene]] {{chem2|H2C\dCH\sCH\dCH\sCH3}}, or the compound |
|||
[[Image:Methine chain.svg|300px|center]] |
|||
Every carbon in this molecule is a methine carbon, except for three; two that are attached to the two [[nitrogen]]s 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. |
|||
Chains of alternating single and double bonds often form [[conjugated system]]s. When closed, as in [[benzene]] {{chem2|(\dCH\sCH\d)3}}, they often give [[aromatic (chemistry)|aromatic]] character to the compound. |
|||
==See also== |
|||
* [[Methyl group]] −{{chem|CH|3}} |
|||
* [[Methylene group]] or methylidene ={{chem|CH|2}} |
|||
* [[Methylene bridge]] or methanediyl −{{chem|CH|2}}− |
|||
* [[Methanetriyl group]] >CH− |
|||
* [[Methylylidyne group]] ≡C− |
|||
==References== |
|||
{{reflist}} |
|||
[[Category:Functional groups]] |
|||
[[Category:Substituents]] |
|||
{{Functional Groups}} |
|||
Revision as of 17:52, 6 November 2019
In 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; 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 with four single bonds, where one bond is to a hydrogen (>CH−).[2]
Chains of alternating single and double bonds often form conjugated systems. When closed, as in benzene (=CH−CH=)3, they often give aromatic character to the compound.
See also
- Methyl group −CH
3 - Methylene group or methylidene =CH
2 - Methylene bridge or methanediyl −CH
2− - Methanetriyl group >CH−
- Methylylidyne group ≡C−
References
- ^ (2007) Methanylylidene group in the Chemical Entities of Biological Interest (ChEBI) database. Accessed on 2015-03-05.
- ^ (2007) Methanetriyl group in the Chemical Entities of Biological Interest (ChEBI) database. Accessed on 2015-03-05.
In 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; 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 with four single bonds, where one bond is to a hydrogen (>CH−).[2]
- ^ (2007) Methanylylidene group in the Chemical Entities of Biological Interest (ChEBI) database. Accessed on 2015-03-05.
- ^ (2007) Methanetriyl group in the Chemical Entities of Biological Interest (ChEBI) database. Accessed on 2015-03-05.