Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 76 for “"oxidative addition"”.
-
Modification of Biopolymers Using Palladium Oxidative Addition Complexes
… In this one-step protocol, the temperature and addition of fuming sulfuric acid were carefully controlled to arrive at sulfonated biaryl monophosphine ligands in high yields with >95% regioselectivity without the need for chromatographic purification. Chapter 3: Palladium Mediated Synthesis of …
-
Oxidative addition of amino acids to iridium(I) metal centers
The oxidative addition of both monosubstituted and disubstituted a.-amino acids to [Ir(COD)(PMe3)3]Cl (COD = cyclooctadiene) was studied and the reactivity of the resulting complexes was examined. The reaction of [Ir(COD)(PMe3)3]CI with the disubstituted amino acids, diphenylglycine and methyl …
-
Oxidative Addition As A New Route To Organometallic Polymers And Dendrimers
… polymers and dendrimers employing an oxidative addition method. The new complexes {dollar}lbrackrm PtMesb2(NN)rbrack{dollar} 1, (1b: (NN) = 4,4{dollar}spprime{dollar}-di-tert-butyl-2,2{dollar}spprime{dollar}-bipyridine; 1c: (NN) = …
-
Kinetic Isotope Effect of the Oxidative Addition Reaction of Hydrogen to Vaska's Compound
The rates of reaction for the oxidative addition of hydrogen and deuterium gas to Ir(CO)Cl{P(C(,6)H(,5))(,3)}(,2) (Vaska's compound) have been accurately measured over the temperature range 0-50(DEGREES)C in toluene. The kinetic isotope effect, i.e., the ratio of the rate constants …
-
Oxidative addition of amino acids and other biologically interesting molecules to an iridium metal center
The oxidative addition of amino acids and other biologically interesting molecules to iridium{(I) complexes was studied and the reactivity of the resulting hydrido chelate complexes was investigated. Oxidative addition of amino acids to [Ir(COD)(PMe₃)₃]Cl resulted in the formation of meridional …
-
C-H activation: oxidative addition to an iridium(I) center and reactivity of the resulting iridium(III) species
… benzaldehyde, pyridine, and furan yield the C-H addition products of mer-(Me₃P)₃Ir(Phenyl)(H)C! (1), mer-(Me₃P)₃Ir(COC₆H₅)(H)Cl (II), mer-(Me₃P)₃Ir(Pyridyl)(H)Cl (IID, and mer-(Me₃P)₃Ir(furyl)Cl (IV), respectively. Each of these complexes was characterized by 1H, 13C, 31P NMR spectroscopy and …
-
O-H activation in phosphates: oxidative addition to an iridium(I) center and reactivity of the resulting iridium(III) species
The oxidative addition of E-H bonds to [Ir(1,5-COD)(PMe₃)₃]Cl (1,5-COD = 1,5- cyclooctadiene) has been previously studied (E = B, C, N, O, S). Some of the resulting species have shown activity as catalysts for hydrogenation and the addition of other molecules to unsaturated species. More recently, …
-
Oxidative addition of N-H and O-H bonds to iridium: developing active catalysts for N-H and O-H additions to unsaturates
The oxidative addition of the N-H bond of both heterocyclic and acyclic amines and the O-H bond of phenols, water and carboxylic acids to iridium(I) trimethylphosphines complexes was studied and the reactivity of the resulting hydrido amido-, aryloxo- and carboxylato iridium(III) complexes was …
-
Computational study on the origins of asymmetric induction in Pd-catalyzed cross-coupling reactions and suggestions for improvements thereupon
… complexes are analyzed in the context of oxidative addition to aryl halides, and ligands are explored in terms of steric and electronic effects relevant to oxidative addition. As one of the most successful ligands to date for the asymmetric Suzuki reaction, KenPhos is given substantial …
-
Synthesis, characterization, and reactivity studies of iridium complexes bearing the ligand diphenylphosphidoboratabenzene
… studies show a rate enhancement for the oxidative addition of a substituted benzyl bromide and Me₃SnBr with DPB as a ligand in place of triphenylphosphine. Two products from the oxidative addition of p-chlorobenzyl bromide have been isolated and structurally characterized.
-
Mechanistic studies on palladium-catalyzed coupling reactions
… coupling reactions. In one case, the oxidative addition of PhX (X = I, Br, Cl) to the complexes Pd(PtBu3)2 (1), Pd(1-AdPtBu2)2(2), Pd(CyPtBu2)2 (3), and Pd(PCy3)2 (4) (1-Ad = 1-adamantyl, Cy = cyclohexyl) was studied to determine the effect of steric properties on the coordination …
-
Design of New, More Stable, Precursors to Organopalladium(II) Complexes and Methods for the Palladium-Mediated Late-Stage Diversification of Pharmaceuticals
… 1. Pharmaceutical Diversification via Palladium Oxidative Addition Complexes Palladium-catalyzed cross-coupling reactions have transformed the exploration of chemical space in the search for materials, medicines, chemical probes, and other functional molecules. However, cross-coupling of densely …
-
Studies In the Optimization of the Suzuki-Miyaura Reaction
… and estimated Pd-P bond dissociation energies. Additionally, the generation of heteroleptic species serve to confirm the existence of 3:1 compounds. A kinetic study of the oxidative addition of PhBr to Pd(PCy3)2 was also performed. It was found that oxidative addition was first order in …
-
Expanding Deoxygenative Transformations of Alcohols by Phosphorus Compounds Through Geometric Deformation
… hydridoalkoxyphosphoranes through a formal O–H oxidative addition. Hypothetically, these resulting phosphoranes can undergo deoxygenative reactions of alcohols via C–O cleavage driven by P=O formation through accessing alkoxyphosphonium and alkoxyphosphoranyl species. With the approach …
-
The chemistry of some organotellurium compounds
… have provided evidence that the oxidative addition of an alkyl halide (RX=Mei, BunBr, BusecBr, ButBr, BrCH2-CH=CHCH2Br, and Br(CH2)4Br) to diphenyltelluride and reductive elimination of CH3SCN from Ph2(CH3)Te(NCS) proceeds via radical pathways. A mechanism is proposed for …
-
Synthesis and characterization of poly(proyleneimine)-based Rhodium(I) Metallodendrimers and their evaluation as Hydroformylation catalysts
… rhodium(I) complex yielded a mixture of the oxidative addition and the acyl product, where the acyl product results from a subsequent alkyl migration into the metal carbonyl bond after oxidative addition has occurred. Reaction of methyl iodide with the multinuclear metallodendritic …
-
Catalytic hydroboration: a study of model hydridoiridium and hydridorhodium boron complexes
… the use of iridium and rhodium model complexes. Oxidative addition of the B-H bond in (1,2-phenylenedioxy) borane (catecholborane) to (Me₃P)₃Ir(Cl)(H) (BO₂C₆H₄ (<B>II</B>) produces <i>mer</i>-(Me₃P}₃Ir(Cl)(H)(B0₂C₆H₄) (<B>II</B>), which was characterized by ¹H NMR spectroscopy and single crystal …
-
Redox-active ligand uranium complexes for approaches to multi-electron chemistry
… to facilitate multi-electron processes such as oxidative addition and reductive elimination at single metal centers. Using primarily 2,6-((Mes)N=CMe)2C5H3N) ( MesPDIMe) as a redox-active ligand, highly reduced uranium species bearing bulky cyclopentadienyl-based ancillary ligands, CpxU …
-
Mechanochemical Reaction Development for Addition, Elimination, and Isomerization
… new mechanochemical reactions of three types: addition, elimination, and isomerization.Mechanical forces have been used previously to activate latent catalysts by accelerating dissociation of an inhibiting ligand, but tuning catalytic activity by force remains limited to a single demonstration …
-
Synthesis of Mixed Transition Metal Clusters of Osmium and Rhenium via Metal Hydride Coupling Reactions
… and H(,2)Re(,2)Os(,3)(CO)(,20) is for an oxidative addition to take place. These two compounds are related by a third, lightly stabilized species, HReOs(,3)(CO)(,15)(CH(,3)CN).
Page 1 of 4