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- Persistent_carbene abstract "A persistent carbene (also known as stable carbene or Arduengo carbene) is a type of carbene demonstrating particular stability. The best-known examples are diaminocarbenes with the general formula (R2N)2C:, where the 'R's are various functional groups. The groups can be bridged so that the carbon with unfilled orbitals is part of a heterocycle, such as imidazole or triazole. Carbenes have long been known as very reactive and short lived molecules that could not be isolated, and were usually studied by observing the reactions they undergo. Stable carbenes had been proposed to exist by R. Breslow in 1957, and the first examples of stable carbenes coordinated to metal atoms were synthesized by H.-W. Wanzlick and collaborators. The isolation of a stable liquid dicarbene was reported in 1989 by G. Bertrand and others. In 1991, the group of A. Arduengo reported the synthesis of a stable, isolated, crystalline carbene.Persistent carbenes are still fairly reactive substances, and many will undergo dimerisation, sometimes reversibly.Persistent carbenes can exist in the singlet state or the triplet state, with the singlet state carbenes being more stable. The relative stability of these compounds is only partly due to steric hindrance by bulky groups. Some singlet carbenes are thermodynamically stable in the absence of moisture and (in most cases) oxygen, and can be isolated and indefinitely stored. Others are not thermodynamically stable and will dimerise slowly over days. The less stable triplet state carbenes have half-lives measured in seconds, and therefore can be observed but not stored.".
- Persistent_carbene thumbnail Imidazol-2-ylidene.jpg?width=300.
- Persistent_carbene wikiPageExternalLink 0159Viewer.html.
- Persistent_carbene wikiPageExternalLink 0161Viewer.html.
- Persistent_carbene wikiPageExternalLink 0165Viewer.html.
- Persistent_carbene wikiPageExternalLink 0173Viewer.html.
- Persistent_carbene wikiPageExternalLink books?id=ElV85eHbubQC&pg=PA153&dq=Alder+Bertrand.
- Persistent_carbene wikiPageExternalLink books?id=wp0C10qO0A8C&pg=PA329&dq=moss+jones+platz+Bertrand&cad=1.
- Persistent_carbene wikiPageID "3434970".
- Persistent_carbene wikiPageRevisionID "603023012".
- Persistent_carbene hasPhotoCollection Persistent_carbene.
- Persistent_carbene subject Category:Carbenes.
- Persistent_carbene subject Category:Functional_groups.
- Persistent_carbene subject Category:Organic_compounds.
- Persistent_carbene subject Category:Organometallic_chemistry.
- Persistent_carbene type Abstraction100002137.
- Persistent_carbene type Chemical114806838.
- Persistent_carbene type Compound114818238.
- Persistent_carbene type FunctionalGroups.
- Persistent_carbene type Group100031264.
- Persistent_carbene type Material114580897.
- Persistent_carbene type Matter100020827.
- Persistent_carbene type OrganicCompound114727670.
- Persistent_carbene type OrganicCompounds.
- Persistent_carbene type Part113809207.
- Persistent_carbene type PhysicalEntity100001930.
- Persistent_carbene type Relation100031921.
- Persistent_carbene type Substance100019613.
- Persistent_carbene comment "A persistent carbene (also known as stable carbene or Arduengo carbene) is a type of carbene demonstrating particular stability. The best-known examples are diaminocarbenes with the general formula (R2N)2C:, where the 'R's are various functional groups. The groups can be bridged so that the carbon with unfilled orbitals is part of a heterocycle, such as imidazole or triazole.".
- Persistent_carbene label "Carbeno persistente".
- Persistent_carbene label "N-Heterocyclische Carbene".
- Persistent_carbene label "Persistent carbene".
- Persistent_carbene sameAs N-Heterocyclische_Carbene.
- Persistent_carbene sameAs Carbeno_persistente.
- Persistent_carbene sameAs m.09c862.
- Persistent_carbene sameAs Q425776.
- Persistent_carbene sameAs Q425776.
- Persistent_carbene sameAs Persistent_carbene.
- Persistent_carbene wasDerivedFrom Persistent_carbene?oldid=603023012.
- Persistent_carbene depiction Imidazol-2-ylidene.jpg.
- Persistent_carbene isPrimaryTopicOf Persistent_carbene.
