C-C bond formation
Snapshot of a Chelation-Assisted C-H/Alkyne Coupling: A Ruthenium Complex Caught in the Act of C-C Bond Formation
... Ru-H bond and (ii) reductive CC bond formation between the adjacent acyl and cis-stilbenyl groups, are seen to take place selectively without any undesirable side ...olefinic bond and a rather ...
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Reversible Sigma C-C Bond Formation Between Phenanthroline Ligands Activated by (C5Me5)2Yb
... by formation of a C-C bond at the 4,4’-positions, forming the diamagnetic dianionic ...driven bond formation between f-metal complexes is observed in uranium Schiff base complexes in which C-C ...
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Homolytic Bond Strengths and Formation Rates in Half-Sandwich Chromium Alkyl Complexes: Relevance for Controlled Radical Polymerization
... (5.6∙10 3 and 1.15, respectively) in agreement with a controlled process. Compound 4 gave 12% conversion within the initial 5 h at 60°C, then no further increase after 40 h at 80°C. However, further heating to 100°C ...
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Amide Bond Formation via Reversible, Carboxylic Acid-Promoted Lactone Aminolysis
... of the liberated alcohol and amide bond formation employing a peptide-coupling reagent. 2 Alternatively, direct lactone aminolysis procedures suffer from long reaction times or require harsh reaction ...
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Accelerating Palladium-Catalyzed C-F Bond Formation: Use of a Microflow Packed-Bed Reactor
... from ideal especially when compared to other aryl carbon-heteroatom bond forming reactions. [8] We recently described the catalytic conversion of aryl triflates to aryl fluorides using CsF as the fluoride source ...
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UV-initiated Si–S, Si–Se, and Si–Te bond formation on Si(111): coverage, mechanism, and electronics
... Si−H bond is typically in the range of 150−200 °C, as shown through numerous studies on hydrosilylation of alkenes and alkynes on silicon ...Si−EC bond formation, as shown by the control experiment ...
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Biomolecule association rates do not provide a complete description of bond formation.
... of bond formation between receptors and ligands is proportional to the first power of encounter ...of bond formation may scale as a power of encounter duration that is significantly higher ...
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Cobalt-catalyzed carbon-carbon bond formation by activation of carbon-halogen or carbon-hydrogen bonds
... C-CN bond formation from the arylzinc species obtained under cobalt catalysis has been well established, however, some other electrophiles may be investigated to form new C-C or C-heteroatom bonds, such as ...
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Switchable selectivity in Pd-catalyzed [3 + 2] annulations of γ-oxy-2-cycloalkenones with 3-oxoglutarates: C–C/C–C vs C–C/O–C bond formation
... O-Michael addition (O–C bond forming) sequence. The purifi- cation of the crude reaction was easier using the Pd(OAc) 2 and dppb system (Table 1, entry 2), which was thus chosen to continue the optimization. The ...
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C-C bond formation strategy through ecocatalysis: Insights from structural studies and synthetic potential
... In the case of Eco-Pd 3 ® (obtained after HCl treatment of Eco-Pd 1 ® ), the Pd 3d core level presents two contributions, the binding energies of which being characteristic of Pd(II) (see supporting data Fig. S2). The ...
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en fr Mimicking C-C bond forming reactions of core metabolism Reproduction des réactions de formation de liaisons C-C s'opérant au cœur du métabolisme
... 31 2 The Wood-Ljungdahl pathway 2.1 Topology Among the six known carbon fixation pathways in biochemistry, the Wood-Ljungdahl (W-L) pathway is believed to be the most ancient (others being the revere tricarboxylicacid ...
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Asymmetric Carbon-Carbon Bond Formation gamma to a Carbonyl Group: Phosphine-Catalyzed Addition of Nitromethane to Allenes
... During the past several decades, the development of effective chiral catalysts that generate a new carbon–carbon bond and a new stereocenter α or β to a carbonyl group has been the focus of intense investigation. ...
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Photochemistry of CH 3 Cl: Dissociation and CH···Cl Hydrogen Bond Formation
... ■ RESULTS AND DISCUSSION The ground state equilibrium geometry, calculated at the MR‐CISD level with the aug‐cc‐pVTZ(H,Cl)/d‐aug‐cc‐ pVTZ(C) basis set, is in good agreement with the experi‐ mental one. 52 The main ...
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Catalytic C-N and C-F bond formation by organometallic group 11 complexes
... equilibrium fraction of fluorovinyl complex suggests that alkyne insertion into the gold- fluoride bond is a prerequisite for hydrofluorination under these conditions.. T[r] ...
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Carbon-carbon bond formation : from transition metal catalysis to base-promoted homolytic aromatic substitution
... Sustainable chemistry, or green chemistry, refers to the design of processes that reduce or eliminate the use or generation of hazardous substances. 7 The twelve principles of green chemistry also underline the ...
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A valence bond description of the bromine halogen bond
... halogen bond formation, the spin-coupled orbital describing one of the electrons of the donor’s lone pair is localized on the halogen atom in the direction pointing towards the substituent group R of the ...
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La théorie de l’équilibre ponctué - Un bond en avant dans la compréhension du cancer
... m/s n° 11, vol. 27, novembre 2011 922 très longues durées, dites périodes de stase, mais serait ponctué par des phases de changements rapides accompagnées de la formation de nouvelles espèces. Un bon exemple ...
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C-H bond activation catalyzed by Ruthenium nanoparticles
... C-H bond, and it needs a pre- functionalized coupling partner such as halocarbons, boronic acids/esters, triflate ester or organometallic reagents and so on (Scheme ...the formation of C-C bond, C-O ...
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Palladium-Catalyzed [3 + 2]-C–C/N–C Bond-Forming Annulation
... (5 mol %), dppb (10 mol %), NaH (3 equiv) in CH 3 CN at 50 °C]. However, we obtained only a very low amount of the expected fused pyrrolidone 3a (18% yield), along with a significant amount of phenol, arising from 2a ...
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A journey into metal–carbon bond homolysis
... C bond formation with the PVAc • chains, whereas the PS chain-end radical does not form a suffi- ciently strong ...–C bond homolysis ( ∆E = ...
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