carbene


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Related to carbene: Nitrene

carbene

[′kär‚bēn]
(organic chemistry)
A compound of carbon which exhibits two valences to a carbon atom; the two valence electrons are distributed in the same valence; an example is CH2.
References in periodicals archive ?
Colmenares, "Two-step radical reactions that switch low multiplicity channels leading to the carbene and carbyne species detected for Ru([sup.5]F) + C[H.sub.4-n][F.sub.n] (n = 2-4) interactions under matrix isolation conditions," RSC Advances, vol.
Novel imidazole salts, or N-heterocyclic carbene ligands, namely, 1,3-bis(2-hydroxyethyl) imidazolidinium bromide [L.sub.A], 3-(2-ethoxy-2-oxoethly)-1-(3-aminopropyl)-1H-imidazol-3-ium bromide [L.sub.B], 1,3-bis(2-carboxyethyl)-4-methyl-1H-imidazol-3-ium bromide [L.sub.C], and 3-(2-carboxyethyl)-1-(3-aminopropyl)-1H-imidazol-3-ium bromide [L.sub.D] were synthesized, and they were preliminary confirmed by GC-MS and elemental analysis methods.
Michaelis et al., "In vitro and in vivo investigations into the carbene silver acetate anticancer drug candidate SBC1," Letters in Drug Design and Discovery, vol.
Veiros et al., "Tuning the reactivity of Dirhodium(II) complexes with axial Nheterocyclic carbene ligands: the arylation of aldehydes," Angewandte Chemie International Edition, vol.
"We weren't the first people who looked at heterocyclic carbenes as ligands," he says, "but we and a number of other people started to look at them at a very fundamental level."
(2007) Total synthesis of ([+ or -])-phomactin B2 via an intramolecular cyclohexadienone annulation of a chromium carbene complex.
the presence of the char-acterisiic resonance signals of the benzylidcnc carbene proton can be considered for directly assaying Ihe degradation state of the catalyst.
N-heterocyclic carbene (NHC) molecules have been extremely abundant in the chemical literature for over a decade.
Maryland) present this volume on carbene chemistry.
Meyer, "Copper complexes of nitrogen-anchored tripodal N-heterocyclic carbene ligands," Journal of the American Chemical Society, vol.
Al-Rawi, "Synthesis and anticancer activity of paraxylyl linked bis-benzimidazolium salts and respective Ag(I) Nheterocyclic carbene complexes," Medicinal Chemistry Research, vol.
A number of new catalysts have also been reported for this reaction which includes lanthanum(In)-binaphthyl disulfonate [7], nanocrystalline magnesium oxide [8], BINOL-phosphoric acid [9,10], Fe[(Cp).sub.2]P[F.sub.6] [11], Jacobsen's thiourea catalyst [12], N-heterocyclic carbene (NHC)-amidate palladium (II) complex [13], Yb[(OTf).sub.3]-pybox [14], [K.sub.2]Pd[Cl.sub.4][15], gallium (III) triflate [16], bisformamides [17], IBX/TBAB [18], Lewis base, for example, N,N-dimethylcyclohexylamine [19], superparamagnetic iron oxide [20], and ionic liquid [21].