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Showing 1 to 20 of 51 for “"phosphine ligands"”.
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Unsymmetrical tridentate phosphine ligands
… synthetic route, via phosphonium salts and phosphine oxides has been developed for the preparation of unsymmetrical triphosphine ligands, which necessarily contain one central chiral phosphorus atom. The ttparent" tridentate phosphine is (2- diphenylphosphinoethyl)(3-diphenylphosphinopropyl) …
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Synthesis of novel phosphine ligands
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Chemistry, 1995.
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Synthesis and applications of atropisomeric quinazolinone phosphine ligands
Several novel atropisomeric phosphine ligands have been synthesized and evaluated. The syntheses of 2-methyl-3-[2'-(diphenylphosphino)phenyl]-4(3H)- quinazolinone (la) and its methyl-substituted analogs lb and ic were achieved in good yield by coupling N-acetylanthranilic acid with the …
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Dinitrogen complexes of titanium and vanadium stabilized by phosphine ligands
… complexes of titanium and vanadium from phosphine-based starting materials. The reactions of TiCl₄, TiCl₃(THF)₃, or VCl₂(TMEDA)₂ with LiN(SiMe₂CH₂PR₂)₂ (R = isopropyl or methyl) yielded the new phosphine complexes TiCl₃[N(SiMe₂CH₂PPri₂)₂] (1), TiCl₃[N(SiMe₂CH₂PMe₂)₂] (2), …
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Palladium and platinum complexes of trans-coordinating bidentate phosphine ligands
Two ditertiary phosphine ligands, 1,6.-bis(diphenylphosphino)-hexane, (dPh), and 3,31_bis(diphenylphosphinomethyl)biphenyl, (PP), have been used in the preparation of complexes described in this work. Construction of molecular models proved useful in predicting the likely geometries of the …
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Novel type-II nanocrystal quantum dots and versatile oligomeric phosphine ligands
… type-II quantum dots and versatile oligomeric phosphine ligands. Type-II band engineered quantum dots (CdTe/CdSe(core/shell) and CdSe/ZnTe(core/shell) heterostructures) are synthesized by chemical means. The optical properties of these type-II quantum dots are studied in parallel with their …
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The Development of Asymmetric Palladium-Catalysed Transformations Using Chiral Sulfonated Phosphine Ligands
… palladium-catalysed reactions using sulfonated phosphine ligands. Firstly, a library of achiral sulfonated phosphine ligands that are ion-paired with a chiral cation were synthesised. These ligands only had modest success in a selection of transition metal- catalysed processes evaluated, but …
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Synthesis and application of sterically flexible and water-soluble phosphine ligands in palladium catalysis
… on the design and synthesis of water-soluble phosphines for application in aqueous and biphasic palladium catalysis. Our group, through collaboration with the Dixon and Rogers groups, seeks also to better understand how phosphine ligand structure influences catalysis in order to design more …
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Tripodal Inorganic 2-Pyridyl-phosphine Ligands and Unsymmetrical Analogues: Towards New Applications in Catalysis
Although a range of phosphorus-based ligands are used 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 …
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Stereoselective Heterocycle Synthesis via Alkene Difunctionalization: Bulky Phosphine Ligands Enable Pd-Catalyzed Arylhalogenation, Arylcyanation and Diarylation
Due to the ubiquity of heterocyclic scaffolds in naturally occurring compounds and pharmaceutical drugs, an important longterm goal in organic chemistry has been developing new heterocycle syntheses. Research in the Lautens group has led to many advances in this field, specifically using Rh and Pd …
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Use of water-soluble phosphine ligands in heterogeneous hydroformylation catalysis : application to long-chain 1-alkenes
The two-phase rhodium-tri(m-sulfonatophenyl)phosphine (Rh-TPPTS) system for the hydroformylation of 1-octene, 1-decene, and 1-dodecene to the corresponding aldehydes, has been investigated. Due to the two distinct phases - the catalytic species in the aqueous phase and the products and reactants in …
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Synthesis and hydrogenation of iridium complexes with bidentate and water-soluble phosphine ligands: developing novel water-soluble catalysts for hydrogenation of unsaturates
… bridge-splitting reactions with bidentate phosphine ligands to produce coordinatively unsaturated, 16 electron complexes of the form [Ir(COD)(P-P)]Cl (P-P = bidentate phosphine). Two bidentate ligands were examined: 1,2-bis(dimethylphosphino)ethane [DMPE] and 1,2-bis(diethylphosphino)ethane …
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Synthetic, Structural and Thermochemical Studies of N-Heterocyclic Carbene (NHC) and Tertiary Phosphine Ligands in the Ni(CO)2(L)x (L-PR3, NHC) Systems
… with NHC and tertiary phosphine ligands leading to the formation of Ni(CO)2(L)2 (L = NHC, PR3) complexes have been determined. The solution calorimetric investigations reiterate the greater electron donating property of the NHC ligands compared to tertiary phosphines. …
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Hydrophosphination of Vinylcyclopropane & Quinine for Metal Coordination Chemistry
Phosphine ligands play a pivotal role in academia and the chemical industry, facilitating catalytic reactions for producing high value chemicals. Consequently, significant interest exists in developing new and efficient synthetic routes for new phosphorus-containing molecules. One key approach is …
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Palladium-Catalyzed Cross-Coupling Reactions of Organosilanols: I. New Methods That Employ Alkynylsilanols and Bissilyl Reagents. II. Mechanistic Analysis of the Cross-Coupling of Aryldimethylsilanolates
… Arylpalladium(II) silanolate complexes bearing phosphine ligands were isolated and characterized. These complexes produce biaryl products via ligand dissociation and transmetalation.
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Late transition metal catalyzed C-N and C-C bond forming reactions
… but gave way to systems that used chelating phosphine ligands which substantially expanded the scope of the catalytic amination methodology. Palladium catalyst systems based on BINAP ((2,2'-diphenylphosphino)-1, 1 '-binaphthyl) allowed for the transformation of a much wider range of amines …
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The synthesis, characterization and properties of new organometallic polymers
… platinum complexes containing bulky dendritic phosphine ligands, cis-Pt(RDP)₂Cl₂ and trans,trans,trans-RuCl₂(CO)₂(RDP)₂, have been prepared. These new phosphine complexes have been characterized by IR, ¹H, ¹³C and ³¹P NMR, as well as elemental analysis. We also discuss the potential catalytic …
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Manganese-catalyzed carbonylation of alkyl iodides
… since they are important precursors to biaryl phosphine ligands. The project did not succeed due to stability problems of the formed substituted zirconium biaryl. A general method for the manganese-catalyzed carbonylation of alkyl iodides while using a variety of nucleophiles was developed. The …
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