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Showing 1 to 20 of 33 for “"phenolate"”.
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Quantitative Kinetic Analysis of Olefin Polymerization by Single-Site Group IV Amine Bis-Phenolate Catalysts
Polymerization by homogeneous single-site catalysts is a recent and growing area of research. While single-site catalysts are typically not as fast as heterogeneous ones, their major advantage is that the kinetic rate constants may be manipulated through precise changes to the catalyst structure …
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Kinetics and Mechanisms of Amine Bis-phenolate Polymerization Catalysts Featuring Titanium, Zirconium, or Hafnium Centers
… reactivity in a family of Group IV amine bis-phenolate catalysts.</p>
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Synthesis, spectroscopic, and electrochemical properties of 3d metal and ruthenium complexes with phenolate and catecholate ligands
<p>The integration of amphiphilic properties into transition metal coordination systems is a pertinent step toward the development of candidate metallosurfactant precursors for the formation of responsive monolayer films. This concept is intended to preserve the solution-observed redox, …
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The Mechanisms, Products, and Kinetics of Triclosan-Free Chlorine Reactions
… chlorine, only the reaction between HOCl and the phenolate-triclosan was found to play a significant role in the kinetics. The second order rate constant for the reaction between phenolate-triclosan and HOCl was found to be 5.40 (±1.82) Ã 103 M⁻¹s⁻¹. Three chlorinated triclosan intermediates were …
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A Method of Preparation of 4-Nitro Diphenyl Ether
… treating a nitrohalogen benzene with an alkaline phenolate in alcoholic solution. Willgerodt (1879) Haeussermann and Teichraann (1896) Ullmann (1896) and Cook (1900) popularized this method and added much prestige to its possibilities.
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Phosphazenbasen und die Darstellung nicht-koordinierter Anionen
… den Bereichen Wasser und Hydroxide, Phenole und Phenolate sowie Silanole und Silanolate. Im Rahmen dieser Dissertation wurden sowohl nicht-koordinierte Anionen, als auch wasserstoffverbrückte Derivate synthetisiert und hinsichtlich ihrer Struktur-Reaktivitäts-Beziehung studiert. Des Weiteren …
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Metal complexes involving pyridoxine and pyridoxamine
… with chelation probably occurring through the phenolate oxygen and either the amino or the hydroxy group at the 4' position.
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Mechanism and kinetics of homogeneous catalysis
… mechanisms for a series of Group IV amine bis-phenolate complexes led to the development of several structure−activity relationships.^ For some of the catalysts of the bis-phenolate family the primary set of elementary reactions had proven inadequate and further investigation using the analysis …
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Synthesis and Characterization of I. Organometallic Amidophenolate Complexes II. Cyanometallate Frameworks
… with the deprotonated catecholate or amidophenolate ligands afforded the corresponding Pt(NIL)(diene) complexes. The complexes Pt(tBAFPh)(COD), Pt(tBAFPh)(nbd), and Pt(O2C 6H2tBu2)(COD) (H2tBA FPh = 2-(2-trifluoromethyl)anilino-4,6-di-tert-butylphenol) were examined by cyclic voltammetry. …
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Studies of Structure and Reactivity in Monolayer Assemblies: 1. Ozonolysis of Alkanethiolate Self Assembled Monolayers on Au. 2. In-Plane Resistivity of Ultrathin Gold Films as a High Sensitivity, Molecularly Differentiated Probe of Chemisorption at the Liquid-Metal Interface
… but weakly adsorbed species, such as pyridine or phenolate at open circuit, induce no observable change in the Au film resistance. Resistivity measurements implemented with a high stability current source and high-precision digital voltmeter sampling at 1 Hz resulted in 3 sigma uncertainties in …
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Probing Proteasome Inhibition By Metal Copmplexes As A New Route For Anticancer Therapy
… in various ligand systems containing phenolate and pyridyl donor sets. The mechanistic behavior of these complexes in solution has been thoroughly investigated along with their in vitro anticancer properties against the growth of prostate cancer PC-3 cells. It has been demonstrated …
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Investigations into dianionic scorpionate ligands and their metal complexes
… reactivity. Inspired by scorpionate ligands and phenolate ligands throughout the literature, a set of eight neutral ligands were synthesized and utilized in the generation of metal complexes. These novel ligands were diphenolate ligands with a nitrogen or oxygen containing tail. The steric …
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Palladium and platinum complexes of vitamin Bâ
… metal through the aminomethyl nitrogen and the phenolate oxygen atoms whereas in the complexes, trans-PdCI2 (PN)2' cis-PdCI2 (PN)2 and cis-PdC12 (PL)2 the vitamin B6 ligands are coordinated to the metal through the pyridine ring nitrogen. The compounds [PLH+ ]2[PtCI6] 2- .H20 and [PMH2] 2+ …
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Redox-Active Trivalent Metallosurfactants With Low Global Symmetry For Molecule-Based Electronics: Spectroscopic, Electrochemical, And Amphiphilic Properties Of New Molecular Materials For Current-Voltage Measurements In M|lb-Monolayer|m Devices
… this phenomenon, a series of ligands with phenolate moieties and, their gallium(III), iron(III), and manganese(III) complexes with [N2O3] and [N2O2] coordination environments were synthesized and structurally characterized using multiple methods. Ligands were designed with different …
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Towards polyethylene-based materials with non-alternatively incorporated carbon monoxide monomer
… were also pursued. Five new κ2-[phosphine-(di)phenolate]Ni(II)Me complexes with either mono- or trinuclear structures were also synthesized, characterized, and utilized in the catalytic (co)polymerization of ethylene. These complexes were accessed from the complexation of (TMEDA)NiMe2 …
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Investigation Of New Ligand Architechtures Towards Proton And Water Reduction Catalysis By Cobalt Complexes
… Ligand design was varied from pentadentate donor phenolate to tetradentate acceptor oxime in order to reduce the overpotential of hydrogen generation in organic solvents. We altered the substitution, axial ligands and axial ligand substitutions to vary electronic and catalytic properties for such …
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Catalytic Activity of Tungsten-dioxo and Tungsten-diimido Complexes
… of d0 dioxo-W(VI) complexes bearing a bulky phenolate ligand which were active towards the dehydration and deoxydehydration of polyols. The selective homogeneous dehydration of 1-phenyl ethanol to styrene was performed at low catalytic loading with high yields. The dehydration of a variety of …
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New Pre-Catalysts for Olefin Polymerisation and Ring-Opening Polymerisation of Lactides/Lactones
A number of pre-catalysts featuring phenoxyimine, phenolate and calixarene ligand systems have been synthesized, characterised and screened for their ability to polymerize α-olefins or ring open polymerize (ROP) cyclic esters. The treatment of a number of related phenoxyimine ligands (L1H – L3H, …
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Synthesis and characterization of novel macromolecules/networks via side chain modifications of amorphous poly(arylene ethers)
… reaction of both the o-aromatic amine and the phenolate with the activated dinalide was occurring. This was further confirmed by the successful oligomerization of o-aminophenol itself with 4,4'-dichloro diphenylsulfone, which afforded NMP soluble novel poly(sec-amino phenoxy diphenylsulfones) …
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Density functional theory investigation into mechanisms of metal ion-promoted and base-promoted phosphorothioate cleavage reactions and Lanthanide ion catalysts for kinetic resolution of amino acid esters
… free energy values of starting materials and phenolate products for a series of related substrates. Direct comparison of starting material and anionic leaving group free energies results in a poor approximation of βeq, however given that the βeq value for the equilibrium of phenol and …
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