Carbene: Difference between revisions

The term "carbene" may also refer to the specific compound H₂C''':''', also called [[methylene radical|methylene]], the parent [[hydride]] from which all other carbene compounds are formally derived.<ref>{{Cite book|title=Molecular Orbitals of Transition Metal Complexes|isbn=978-0-19-853093-0|page=7|last=Hoffmann|first=Roald|author-link=Roald Hoffmann|publisher=Oxford|year=2005}}</ref><ref>{{GoldBookRef|title=carbenes|file=C00806}}</ref> Carbenes are classified as either [[singlet state|singlets]] or [[triplet state|triplets]], depending upon their electronic structure. Most carbenes are very short lived, although [[persistent carbene]]s <ref>For detailed reviews on stable carbenes, see: (a) {{cite journal | last1 = Bourissou | first1 = D. | last2 = Guerret | first2 = O. | last3 = Gabbai | first3 = F. P. | last4 = Bertrand | first4 = G. | year = 2000 | title = Stable Carbenes| journal = [[Chem. Rev.]] | volume = 100 | issue = 1 | pages = 39–91 | doi = 10.1021/cr940472u | pmid = 11749234 }} (b) {{cite journal | last1 = Melaimi | first1 = M. | last2 = Soleilhavoup | first2 = M. | last3 = Bertrand | first3 = G. | title = Stable cyclic carbenes and related species beyond diaminocarbenes | year = 2010 | journal = [[Angew. Chem. Int. Ed.]] | volume = 49 | issue = 47 | pages = 8810–8849 | doi = 10.1002/anie.201000165 | pmid = 20836099 | pmc = 3130005 }}</ref> are known. One well-studied carbene is [[dichlorocarbene]] Cl₂C''':''', which can be generated ''[[in situ]]'' from [[chloroform]] and a strong [[base (chemistry)|base]].