In 2007, Bertrand and co-workers described a hydrogen activation using (alkyl)(amino) carbenes, in which the carbene carbon serves as both Lewis acid and base.5 Besides the activation of H2, FLPs can also activate other small molecules including CO2, NO, N2O, and SO2.6 One of the most...
The reactive molecules are described as vinylic adsorbed species in equilibrium with carbene and carbyne species. The first lead to a cis addition mechanism. The latter two lead to the trans addition and direct hydrogenation.doi:10.1016/0021-9517(88)90044-9Serge Hub...
Catalytic cyclopropanation of alkenes via (2-furyl)carbene complexes from 1-benzoyl-cis-1-buten-3-yne with transition metal compounds The reaction of alkenes with conjugated ene-yne-ketones, such as 1-benzoyl-2-ethynylcycloalkenes, with a catalytic amount of Cr(CO)(5)(THF) gave 5-phenyl-2...
To probe the mechanism of quioline reduction, the regio-specificity of hydrogen transfer with the selectively deuterated ammonia borane derivatives D3N∙BH3 and H3N∙BD3 was investigated for 2u (Fig. 5). Tracing the regioselectivity of the deuterium addition to 2u with D3N∙BH3, deuterium ...
In addition to the brilliant chiral phosphorus metal catalysts, chiral phosphine-free metal complexes find increasing application as catalysts for asymmetric hydrogenation. In this account, two types of chiral phosphine-free ligands, N-heterocyclic carbene-based C,N-ligands and diamine-based N,N-ligand...
(2014). Metal–ligand bifunctional reactivity and catalysis of protic N-heterocyclic carbene and pyrazole complexes featuring β-NH units. Chem. Commun. 50: 14290–14300, https://doi.org/10.1039/c4cc04457f.Search in Google Scholar PubMed Lane, E.M., Zhang, Y., Hazari, N., and Berns...
controlled by two carbene ligands. A cyclic (alkyl)(amino)carbene ligand that contains a phosphino anchor enables the hydrogenation of alkynes in atrans-addition manner, selectively formingE-olefins. With an imino anchor-incorporated carbene ligand, the stereoselectivity can be switched, giving mainly...
pathways involves a single concerted step with a four-membered transition state keeping the oxidation state of tantalum unaltered, where as the other pathway deals with a two step reaction with α-insertion of H₂ to produce a 16e⁻ Ta(III)-methyl species and a subsequent oxidative addition...
In addition to the hydrogenation of carbon dioxide, the reduction of HCO3− in aqueous solution is feasible by transition metal complexes (78–81). At present, a variety of homogeneous catalysts of group VIII transition metals indicate a high activity for the synthesis of formic acid and its ...
The chemistry of the carbon-transition metal double and triple bond: Annual survey covering the year 2017 2018, Coordination Chemistry Reviews Citation Excerpt : Although not specifically focusing on metal-carbene complexes, some review articles place some emphasis on this subject. Subjects reviewed in...