[PDF] Top 20 Improved Synthesis and New Applications of N-Heterocyclic Carbenes for Catalysis.
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Improved Synthesis and New Applications of N-Heterocyclic Carbenes for Catalysis.
... metal catalysis, exhibiting characteristics similar to other strong -donating ligands in metal coordination chemistry that have the ability to bind to practically any transition ...their synthesis are ... See full document
76
Synthesis of palladium(II)-N-heterocyclic carbene via transmetaliation of silver(I) complex and its catalytic activity in epoxidation of alkene
... rather new synthetic ways for preparation of flexible catalytic systems of a high synthetic value in organic and organometallic ...many applications over conventional coordination catalysts ... See full document
46
Development of N-Heterocyclic Carbenes as Organic Catalysts and Efficient Ligands in Palladium Mediated Transformations
... exhaustive applications in organic ...further applications of rhodium-carbene complexes in separate ...in catalysis of Heck coupling 51,52 with a report by Calo with thiazolium carbene-palladium ... See full document
293
Synthesis and NMR study of N-heterocyclic carbenes (NHC) precursors derived from Tröger’s Base
... and N-heterocyclic carbenes (NHC) ligands are particularly more ...a synthesis of NHC precursors derived from the Tröger’s base and its analogues which can be used in the synthesis of ... See full document
8
Polar organometallic strategies for regioselective C-H metallation of N-heterocyclic Carbenes
... the synthesis of novel non-symmetrical NHC ligands and promoting small molecule activation ...and new applications of anionic NHCs in small molecule activation processes as well as in general ... See full document
8
Copper(I) complexes bearing carbenes beyond classical N heterocyclic carbenes : synthesis and catalytic activity in “click chemistry”
... a N-heterocyclic carbene (NHC, I) by Arduengo and co-workers in the early 1990’s led to major breakthroughs in organometallic ...the synthesis of even more electron-donating ligands is a topic of ... See full document
7
Non classical anionic naked N heterocyclic carbenes: fundamental properties and emerging applications in synthesis and catalysis
... and applications in synthesis ...synthetic applications of metal complexes bearing non-classical NHCs; in particular, anionic NM,NR-NHC and naked N,NR-NHC ...their applications in ... See full document
21
Phase Transfer Catalysis Improved Synthesis of 3,4 Dihydropyrimidinones
... organic synthesis and medicinal chemistry because they offer direct access to complex molecules ...of heterocyclic com- pounds with pharmacological and biological properties ...the synthesis of ... See full document
5
Nano TiO2: A recyclable catalyst for one pot synthesis of 2 (substituted phenyl) phthalazin 1(2H) one
... To find out the optimum reaction conditions, we have considered the synthesis of (3a). Further we studied the effect of solvent on reaction kinetics and yield of product using Nano TiO2 as catalyst (50 mol %). A ... See full document
5
Rate and equilibrium constants for the addition of N Heterocyclic Carbenes into benzaldehydes : a remarkable 2 substituent effect
... [5] a) H. Stetter, G. Dmbkes, Synthesis 1977, 403 – 404; b) S. M. Mennen, S. J. Miller, J. Org. Chem. 2007, 72, 5260 – 5269; c) S. E. O’Toole, C. A. Rose, S. Gundala, K. Zeitler, S. J. Connon, J. Org. Chem. 2011, ... See full document
6
Synthesis of Precursor Imidazolium Salts for the Synthesis of N-Heterocyclic Carbines Used as Ligands for the Enantioselective Preparation of Heterosteroids Compounds
... advantage of this method is the broad tolerance for sensitive N-substituents, which can be destroyed by conventional deprotonation of an imidazolium salt with strong bases. Transmetalation to various metal species ... See full document
8
Synthesis and biological activity of new steroidal heterocyclic compounds
... Nonsteroidal anti-inflammatory drugs (NSIDs) are an inhomogeneous family of pharmacologically active compounds which are widely used in treatment of acute and chronic inflammation, pain and fever, However, long-term ... See full document
5
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] ... See full document
259
Organo- and Metal-Catalyzed Regioselective Allylic Substitution Using N-Heterocyclic Carbenes.
... of N-acyl protecting group to synthesize rhodium and iridium protic NHC ...the N-methyl-substituted N-acyl benzimidazole 4 and then this would react with a strong base in the presence of a copper ... See full document
86
A Quantitative Analysis of Factors Influencing Ease of Formation and σ-Bonding Strength of Oxa- and Thia-N-Heterocyclic Carbenes.
... of N-heterocyclic carbene (NHC) formation either by deprotonation of precursor salts to give neutral NHCs or deprotonation of heterocyclic mesomeric betaines to give anionic NHCs is ... See full document
15
Applications of N′ monofunctionalised TsDPEN derivatives in asymmetric catalysis
... Compounds containing a combination of proline and TsDPEN have been applied to asymmetric aldol reactions.[74] Amide 41 (Figure 41) was one of a series of catalysts for an asymmetric aldol reaction reported by Zhao and ... See full document
37
What can NMR spectroscopy of selenoureas and phosphinidenes teach us about the π-accepting abilities of N-heterocyclic carbenes?
... of new and existing NHC ligands; (iii) the groundwork has been laid for the use of these calculations to predict the properties of NHCs; and nally (iv) data have been furnished for a series of key NHCs of ... See full document
10
What can NMR spectroscopy of selenoureas and phosphinidenes teach us about the π accepting abilities of N heterocyclic carbenes?
... A range of selenourea compounds were prepared from the corresponding free NHCs or imidazolium salts in a straight- forward manner; full details of the synthesis and character- isation of these species can be found ... See full document
10
Synthesis, Characterization and Antibacterial Activity of Cefalexin Dervatives Entesar O. AL-Tamimi| Raad M. Muslih| Khalida A.Thejeel
... and disappearance the absorption of – C=N- group. 1 HNMR spectral of compounds 2a 2b singlate signal at δ = 8.21ppm and at δ = 8.11ppm due to (– CH=N-) proton and signals for 3a and 3b at δ = 5.23 ppm due ... See full document
9
New methods for the synthesis of heterocyclic compounds
... process.12h N ovel transformations such as this one, which allowed for the rapid construction of the carbon frameworks of target molecules so elegantly and with such characteristic and breathtaking originality, ... See full document
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