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Showing 1 to 20 of 113 for “"phosphines"”.
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Structural studies on biaryl phosphines and palladium complexes composed of biaryl phosphines
… effective class of ligand is that of biaryl phosphines. Herein are presented experimental and theoretical structural data on this class of phosphine that aids in elucidating what aspects of ligand architecture are beneficial for catalyst stability and reactivity. Additionally, examples of …
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Water Soluble Phosphines, Their Transitional Metal Complexes, and Catalysts
In recent years two-phase catalysis has been established as a new field of catalyzed processes and has achieved industrial-scale importance in olefin hydroformylation. Two-phase reactions have a number of advantages, for example, ease of separation of catalyst and product, catalysts can be tailored …
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Ligand modification and catalysis : water-soluble phosphines and chiral cyclopentadienes.
Thesis. 1977. Ph.D.--Massachusetts Institute of Technology. Dept. of Chemistry.
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Cesium Effect: A Mild and Efficient Synthesis of Secondary and Tertiary Phosphines
… tertiary, as well as disecondary and ditertiary phosphines has been developed. Using reaction conditions that include cesium hydroxide, molecular sieves, and DMF, at room temperature, a wide range of alkyl halides has been coupled to primary or secondary phosphines to yield secondary or tertiary …
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Elaboration of micelle formation in aqueous and two phase solutions by surface active phosphines
The surface active phosphine ((C6H4))C3H6((C6H4)S03 N+)3,1, aggregates in aqueous solution to form micelles. Light scattering experiments were used to determine the hydrodynamic radius of the aggregates. Fluorescence, conductivity, and surface tension experiments were used to measure the critical …
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Investigation of phosphines as potential host materials in blue dye-doped organic light emitting devices
… (P-STIL) suggested that tertiary aromatic diphosphines (TAPs) may be suitable candidates. Therefore, the P-containing materials, 4,4'-bis(naphthylphenylphosphino)biphenyl (alpha-P-NPD) and 4,4'-bis(diphenylphosphino)biphenyl (P-DDB) were synthesized and the photophysical properties were …
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Asymmetric nucleophilic catalysis with planar-chiral DMAP derivatives and chiral phosphines : synthetic and mechanistic studies
Chapter 1 describes the development and detailed mechanistic investigation of the first non-enzymatic method for the dynamic kinetic resolution of secondary alcohols via enantioselective acylation, with acetyl isopropyl carbonate, through the use of a planar-chiral DMAP derivative (an acylation …
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Influence of solution ionic strength on aggregation of novel water soluble phosphines and two phase catalysis
The preparation of new water soluble phosphines for organometallic chemistry and catalysis in water is important to the development of environmentally benign homogeneous catalysts. A series of steric demanding surface active phosphines have been synthesized and fully characterized. Two phase …
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Complexation, coupling, and cleavage of organonitriles, alkynes, dinitrogen, hydrostannanes or phosphines by three-coordinate molybdenum(III) complexes
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Chemistry, February 2002.
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Synthesis and Coordination Chemistry of Water-soluble Phosphines: Application to Ru-Catalyzed Hydration of Nitriles in Aqueous and Biphasic Media
… ligands. Ruthenium arene complexes of â-aminophosphines PTA-CR1R2NHPh were synthesized and exhibited hemilabile behavior. All compounds were structurally characterized both in solution (multinuclear (1H, 13C, 31P) NMR spectroscopic studies, and ESI-MS) and in the solid state (IR, and …
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Amphiphile Phosphane für die Anwendung in neuen polaren Medien
… dedicated. A novel synthesis of 2-imidazolium-phosphines via deprotonation of choosen ionic liquids based on imidazolium-groups with n-BuLi and subsequent reaction with Ph2PCl has been elaborated. Additional phosphines of this type have been synthesized by metathesis reaction or by selective …
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Exploring the Chemistry of Bis(azido)phosphine Chalcogenides and the Pursuit of Isolable Phosphinidene Chalcogenides
… towards new methods of preparing electron rich phosphines, and the dual-reactivity modes of bis(diisopropylamino)cyclopropenone to generate a chlorophosphonate or cyclic phosphonates. Chapter 2 outlines the strategies pursued for the generation of a phosphinidene sulfide utilizing a π-donating …
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Hydrophosphination of Vinylcyclopropane & Quinine for Metal Coordination Chemistry
… with primary (RPH2) or secondary (R2PH) phosphines without initiators. The resulting tertiary phosphines were converted into air and moisture stable phosphine sulfides and phosphine oxide. Control experiments suggest these UV promoted reactions proceeded via a radical mechanism despite …
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Tripodal Inorganic 2-Pyridyl-phosphine Ligands and Unsymmetrical Analogues: Towards New Applications in Catalysis
… extensively in homogeneous catalysis, 2-pyridyl-phosphines have been largely overlooked in this field. However, such ligands offer great potential for catalytic applications through the combination of two ligand sites with different donating and accepting properties. In Chapter 1 previous studies …
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Theoretical Studies of Structures and Mechanisms in Organometallic and Bioinorganic Chemistry: Heck Reaction with Palladium Phosphines, Active Sites of Superoxide Reductase and Cytochrome P450 Monooxygenase, and Tetrairon Hexathiolate Hydrogenase Model
The electronic structures and reaction mechanisms of transition-metal complexes can be calculated accurately by density functional theory (DFT) in cooperation with the continuum solvation model. The palladium catalyzed Heck reaction, iron-model complexes for cytochrome P450 and superoxide reductase …
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