-Heterocyclic Carbenes
Polar organometallic strategies for regioselective C-H metallation of N-heterocyclic Carbenes
... N-heterocyclic carbenes (NHCs) have become indispensable ligands across a broad swathe of the synthetic and catalytic landscape, not in small part due to their ease of electronic and steric ...
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Synthesis and NMR study of N-heterocyclic carbenes (NHC) precursors derived from Tröger’s Base
... Since the discovery of olefin metathesis reactions, various catalysts have been developed but those based on Ruthenium and N-heterocyclic carbenes (NHC) ligands are particularly more efficient. Herein, we ...
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Coinage metal complexes of selenoureas derived from N-heterocyclic carbenes
... We describe the synthesis and characterisation of a series of new copper and silver complexes with selenourea ligands derived from common and readily-prepared N-heterocyclic carbenes (NHCs). The copper ...
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Organo- and Metal-Catalyzed Regioselective Allylic Substitution Using N-Heterocyclic Carbenes.
... N-heterocyclic carbenes have played a crucial role in the development of new organocatalytic reactions. The first example of NHC organocatalysis dates back to 1943 when Ugai reported the homodimerization of ...
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N-HETEROCYCLIC CARBENES: FROM DESIGN TO SYNTHESIS AND THEIR APPLICATION AS NUCLEOPHILIC CATALYSTS
... N- heterocyclic carbenes possess the common features of all carbenes as neutral, six- electron, bivalent species they are particularly stable compared to the classical carbenes discovered at ...
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Copper(I) complexes bearing carbenes beyond classical N heterocyclic carbenes : synthesis and catalytic activity in “click chemistry”
... N-Heterocyclic Carbenes in Synthesis, ...N- Heterocyclic Carbenes in Transition Metal Catalysis, ...N- Heterocyclic Carbene in Transition Metal Catalysis and Organocatalysis ...
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A Quantitative Analysis of Factors Influencing Ease of Formation and s-Bonding Strength of Oxa- and Thia-N-Heterocyclic Carbenes.
... N-heterocyclic carbenes (NHCs) by deprotonation of heterocyclic salts and (ii) anionic NHCs by deprotonation of heterocyclic mesomeric betaines ...
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Synthesis of Cyclic Carbonates from CO2 and Diols via Electrogenerated N-Heterocyclic Carbenes
... N-heterocyclic carbenes (NHCs) are well established as organocatalysts and ligands in organic synthesis[8-11] which could be generated by deprotonation with a suitable base[12, 13] or by a direct single ...
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Improved Synthesis and New Applications of N-Heterocyclic Carbenes for Catalysis.
... We successfully have developed a method for the formation of a stable, yet more reactive cyclopropanone starting material and examined its reactivity toward a variety of N-Heterocyclic carbenes. By ...
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Non classical anionic naked N heterocyclic carbenes: fundamental properties and emerging applications in synthesis and catalysis
... 1.Substitution ofofof N-heterocyclic carbene NHC nitrogen atoms delineating: Figure Substitutionpatterns patterns N-heterocyclic carbene NHC nitrogen atoms delineating: AA A “classical” [r] ...
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Au(I) N heterocyclic carbenes from bisimidazolium amphiphiles: synthesis, cytotoxicity and incorporation onto gold nanoparticles
... also provides a further example of a diarylimidazole-based gold NHCs, in which a correlation between complexes' biological activity and both the inactive, non-NHC ligand and the aromatic[r] ...
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Rate and equilibrium constants for the addition of N Heterocyclic Carbenes into benzaldehydes : a remarkable 2 substituent effect
... Abstract: Rate and equilibrium constants for the reaction between N-aryl triazolium N-heterocyclic carbene (NHC) precatalysts and substituted benzaldehyde derivatives to form 3-(hydroxybenzyl)azolium adducts under ...
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A Quantitative Analysis of Factors Influencing Ease of Formation and σ-Bonding Strength of Oxa- and Thia-N-Heterocyclic Carbenes.
... energetics of diverse species needs to consider both the NHC and its precursor since their structure/ substituent effects may differ. The most common route to NHCs is deprotonation of a suitable heterocyclic ...
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Development of N-Heterocyclic Carbenes as Organic Catalysts and Efficient Ligands in Palladium Mediated Transformations
... scope and limitations of these catalytic species in Suzuki-Miyaura cross-coupling reaction. We found our alkoxide base – technical grade isopropanol Suzuki protocol to be the best system for these reactions. While the ...
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What can NMR spectroscopy of selenoureas and phosphinidenes teach us about the π accepting abilities of N heterocyclic carbenes?
... adducts, which were prepared from the reaction of the free NHC with PPhCl2, followed by reduction with KC8 or Mg.19 Ganter utilised 77Se NMR spectroscopy of selenourea compounds, which w[r] ...
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What can NMR spectroscopy of selenoureas and phosphinidenes teach us about the π-accepting abilities of N-heterocyclic carbenes?
... adducts, which were prepared from the reaction of the free NHC with PPhCl2, followed by reduction with KC8 or Mg.19 Ganter utilised 77Se NMR spectroscopy of selenourea compounds, which w[r] ...
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N-heterocyclic germylenes : structural characterisation of some heavy analogues of the ubiquitous N-heterocyclic carbenes
... The meteoric rise of the N-heterocyclic carbene (NHC) ligand family over the past 25 years has been remarkable with the ligands dominating the organometallic chemistry landscape. In particular, the carbenes ...
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The influence of heteroatom substitution on heterocyclic carbenes and their complexes
... Appendix D Cartesian Coordinates of Structures from Chapter Six D.1 Carbenes D.2 Protonated Carbenes Azolium Salts D.3 Complexes D.4 Transition Structures D.5 Products D.6 Separated Prod[r] ...
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Quantifying and understanding the steric properties of N-heterocyclic carbenes
... In order to assess how tuning the backbone of an NHC ligand would affect its overall steric impact on the metal centre, modifications made to the IPr, IDM and IiPr architectures were eva[r] ...
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Backbone tuning in indenylidene ruthenium complexes bearing an unsaturated N heterocyclic carbene
... N-heterocyclic carbenes (NHC) as spectator ligands in ruthenium-mediated olefin metathesis represents one of the most important breakthroughs in this field ...
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