Tag: M.W=400-500

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Intramolecular cyclization of aminoalkynes catalyzed by PdMo 3S4 cubane clusters

PdMo3S4 cubane clusters [(Cp*Mo) 3(mu3-S)4Pd(L)][PF6] (Cp* = eta5-C5Me5; L = dba (2), ma (3); dba = dibenzylideneacetone, ma = maleic anhydride) showed high catalytic activity for the intramolecular hydroamination of aminoalkynes to afford the corresponding cyclic imines in good yields under mild conditions. A molecular structure of 3 has been determined by X-ray diffraction study. Copyright

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Chapter 1 An introduction to palladium catalysis,
Palladium/carbon catalyst regeneration and mechanical application method

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Molybdenum and tungsten eta2-alkyne-1-thio complexes acting as sulfur donors in homoleptic werner type complexes with nickel(II) and palladium(II)

Facile access to the eta2-alkyne-1-thio complexes [Tp?M(CO)2{eta2-(BnS)CC(S)}] (Tp? = hydrotris(3,5-dimethylpyrazolyl)-borate; Bn = benzyl; M = Mo, W) by reductive removal of one benzyl group in the corresponding bis(benzylthio)-acetylene complexes, [Tp?M(CO)2{eta2-(BnS)CC(SBn)}](PF 6), has been thoroughly investigated. Experimental evidence of the intermediates, [Tp?M(CO)2{eta2-(BnS)CC(SBn)}] (M = Mo, W), and the fate of the cleaved benzyl group by isolation of the byproduct, [Tp?W(CO){C(O)Bn}{eta2-(BnS)CC(SBn)}], is provided. Neutral eta2-alkyne-1-thio complexes [Tp?M(CO)2{eta 2-(BnS)CC(S)}] bearing a free terminal sulfur atom have been established as monodentate ligands L in homoleptic pentanuclear [M?L 4]2+ complexes with nickel(II) and palladium(II). Comparison of the NMR and IR spectroscopic as well as cyclovoltammetric data of the heterobimetallic complexes with the free thio-alkyne complexes reveals a strong electronic coupling of the redox-active eta2-CC-bound metal centers and the sulfur-coordinated metal ion.

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Reference£º
Chapter 1 An introduction to palladium catalysis,
Palladium/carbon catalyst regeneration and mechanical application method

Chemistry is an experimental science, and the best way to enjoy it and learn about it is performing experiments. Recommanded Product: Tetrakis(acetonitrile)palladium(II) tetrafluoroborate. Introducing a new discovery about 21797-13-7, Name is Tetrakis(acetonitrile)palladium(II) tetrafluoroborate

Light-triggered guest uptake and release by a photochromic coordination cage

A guiding light is sufficient to switch back and forth between the flexible and the stretched, rigid form of a self-assembled coordination cage based on two square-planar-coordinated PdII ions and four ligands with a photochromic dithienylethene (DTE) backbone. The light-driven interconversion is clean and reversible and allows to control the encapsulation and release of the guest [B12F12]2-. Copyright

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Reference£º
Chapter 1 An introduction to palladium catalysis,
Palladium/carbon catalyst regeneration and mechanical application method

One of the major reasons for studying chemical kinetics is to use measurements of the macroscopic properties of a system, Safety of Tetrakis(acetonitrile)palladium(II) tetrafluoroborate, such as the rate of change in the concentration of reactants or products with time.In a article, mentioned the application of 21797-13-7, Name is Tetrakis(acetonitrile)palladium(II) tetrafluoroborate, molecular formula is C8H12B2F8N4Pd

Room temperature palladium-catalyzed decarboxylative ortho -acylation of acetanilides with alpha-oxocarboxylic acids

A novel Pd-catalyzed decarboxylative ortho-acylation of acetanilides with alpha-oxocarboxylic acids is realized at room temperature. This reaction provides efficient access to o-acyl acetanilides under mild conditions.

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Reference£º
Chapter 1 An introduction to palladium catalysis,
Palladium/carbon catalyst regeneration and mechanical application method

Chemistry is an experimental science, and the best way to enjoy it and learn about it is performing experiments. Product Details of 21797-13-7. Introducing a new discovery about 21797-13-7, Name is Tetrakis(acetonitrile)palladium(II) tetrafluoroborate

Cage Effect on Oxidation of Dimethyl Sulfoxide via Pd2L4 Prolate Spheroids

Self-assembly of PdX2 (X? = NO3 ?, BF4 ?, and CF3SO3 ?) with 2,6-bis(4?-nicotinamidephenoxy)naphthalene (L) forms a series of [Pd2L4]X4 prolate spheroids. The O donors of two Me2SO molecules within the prolate spheroid cage are oriented toward the Pd(II) metal centers. In the presence of H2O2, the nestled Me2SO within the cage is efficiently oxidized to Me2SO2 at room temperature.

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Reference£º
Chapter 1 An introduction to palladium catalysis,
Palladium/carbon catalyst regeneration and mechanical application method

Chemistry is an experimental science, and the best way to enjoy it and learn about it is performing experiments. HPLC of Formula: C8H12B2F8N4Pd. Introducing a new discovery about 21797-13-7, Name is Tetrakis(acetonitrile)palladium(II) tetrafluoroborate

Stereoisomerically controlled inorganic architectures: Synthesis of enantio- and diastereo-merically pure ruthenium-palladium molecular rods from enantiopure building blocks

The construction of nanometre scale RuIIPdIIRuII pi-conjugated molecular rods, Lambda,Lambda-1 and Delta,Delta-1, from enantiomerically pure building blocks, provides a method for obtaining enantio- and diastereo-merically pure RuII-based molecular architectures.

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Reference£º
Chapter 1 An introduction to palladium catalysis,
Palladium/carbon catalyst regeneration and mechanical application method

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Oligomers and soluble polymers from the vinyl polymerization of norbornene and 5-vinyl-2-norbornene with cationic palladium catalysts

Oligomeric vinyl polynorbornene (2 to ?12 monomer units) was obtained via hydrooligomerization of norbornene (NB) using the cationic palladium complexes [Pd(PPh3)n(NCCH3)4-n] (BF4)2 [n = 0 (1), 3 (2)] at different hydrogen pressures. The vinyl polymerization of norbornene (NB) in the ionic liquid N-butyl-N-trimethylammonium bis(trifluoromethylsulfonyl)imide (BtMA +NTf2-) with [Pd(NCCH3) 4](BF4)2 led to soluble polynorbornenes (with several hundred monomer units) at different temperatures and molar NB:Pd ratios. The norbornene derivative 5-vinyl-2-norbornene (VNB) was oligomerized in high yield with 1 in CH3NO2 primarily through the (endocyclic) norbornene double bond but also through both the norbornene and (exocyclic) vinyl double bond for about every second monomer (by 1H NMR). A 2D 1H,13C-HSQC NMR analysis suggests a beta-hydrogen elimination after insertion of a norbornene double bond as chain-termination mechanism. The conversion of NB or VNB increased with temperature and a lower NB:Pd and VNB:Pd ratio, respectively. The vinyl double bond in VNB slowed down the insertion rate drastically when compared with NB (activity decrease by a factor of 102).

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Reference£º
Chapter 1 An introduction to palladium catalysis,
Palladium/carbon catalyst regeneration and mechanical application method

In heterogeneous catalysis, the catalyst is in a different phase from the reactants. Quality Control of Tetrakis(acetonitrile)palladium(II) tetrafluoroborate, At least one of the reactants interacts with the solid surface in a physical process called adsorption in such a way. 21797-13-7, name is Tetrakis(acetonitrile)palladium(II) tetrafluoroborate. In an article£¬Which mentioned a new discovery about 21797-13-7

Aerobic Pd-catalyzed sp3 C-H olefination: A route to both N-heterocyclic scaffolds and alkenes

This communication describes a new method for the Pd/polyoxometalate- catalyzed aerobic olefination of unactivated sp3 C-H bonds. Nitrogen heterocycles serve as directing groups, and air is used as the terminal oxidant. The products undergo reversible intramolecular Michael addition, which protects the monoalkenylated product from overfunctionalization. Hydrogenation of the Michael adducts provides access to bicyclic nitrogen-containing scaffolds that are prevalent in alkaloid natural products. Additionally, the cationic Michael adducts undergo facile elimination to release alpha,beta-unsaturated olefins, which can be further elaborated via C-C and C-heteroatom bond-forming reactions.

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Reference£º
Chapter 1 An introduction to palladium catalysis,
Palladium/carbon catalyst regeneration and mechanical application method

In heterogeneous catalysis, the catalyst is in a different phase from the reactants. Quality Control of Tetrakis(acetonitrile)palladium(II) tetrafluoroborate, At least one of the reactants interacts with the solid surface in a physical process called adsorption in such a way. 21797-13-7, name is Tetrakis(acetonitrile)palladium(II) tetrafluoroborate. In an article£¬Which mentioned a new discovery about 21797-13-7

Using Ligand Bite Angles to Control the Hydricity of Palladium Diphosphine Complexes

A series of [Pd(diphosphine)2](BF4)2 and Pd(diphosphine)2 complexes have been prepared for which the natural bite angle of the diphosphine ligand varies from 78 to 111. Structural studies have been completed for 7 of the 10 new complexes described. These structural studies indicate that the dihedral angle between the two planes formed by the two phosphorus atoms of the diphosphine ligands and palladium increases by over 50 as the natural bite angle increases for the [Pd(diphosphine)2](BF4)2 complexes. The dihedral angle for the Pd(diphosphine)2 complexes varies less than 10 for the same range of natural bite angles. Equilibrium reactions of the Pd(diphosphine)2 complexes with protonated bases to form the corresponding [HPd(diphosphine)2]+ complexes were used to determine the pKa values of the corresponding hydrides. Cyclic voltammetry studies of the [Pd(diphosphine)2](BF4) 2 complexes were used to determine the half-wave potentials of the Pd(II/I) and Pd(I/0) couples. Thermochemical cycles, half-wave potentials, and measured pKa values were used to determine both the homolytic ([HPd(diphosphine)2]+ ? [Pd(diphosphine) 2]+ + H.) and the heterolytic ([HPd(diphosphine)2]+ ? [Pd(diphosphine) 2]2+ + H-) bond-dissociation free energies, DeltaGH. and DeltaGH-, respectively. Linear free-energy relationships are observed between pKa and the Pd(I/0) couple and between DeltaGH- and the Pd(II/I) couple. The measured values for DeltaGH. were all 57 kcal/mol, whereas the values of DeltaGH- ranged from 43 kcal/mol for [HPd(depe)2]+ (where depe is bis-(diethylphosphino)ethane) to 70 kcal/mol for [HPd(EtXantphos)2]+ (where EtXantphos is 9,9-dimethyl-4,5-bis(diethylphosphino)xanthene). It is estimated that the natural bite angle of the ligand contributes approximately 20 kcal/mol to the observed difference of 27 kcal/mol for DeltaGH-.

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Reference£º
Chapter 1 An introduction to palladium catalysis,
Palladium/carbon catalyst regeneration and mechanical application method

One of the major reasons for studying chemical kinetics is to use measurements of the macroscopic properties of a system, Product Details of 21797-13-7, such as the rate of change in the concentration of reactants or products with time.In a article, mentioned the application of 21797-13-7, Name is Tetrakis(acetonitrile)palladium(II) tetrafluoroborate, molecular formula is C8H12B2F8N4Pd

Simultaneous First- and Second-Sphere Coordination. Organopalladium Metalloreceptors for Water, Ammonia, Amines, Hydrazine, and the HydraziniumIon

The complexes [Pd(L)(CH3CN)][BF4] (L(3) = 5,8,11-trioxa-2,14-dithia[15]-m-cyclophane and L(5) = 5,8,11,14,17-pentaoxa-2,20-dithia[21]-m-cyclophane) were prepared by palladation of the respective thiacyclophane employing [Pd(CH3CN)4][BF4]2. These metalloreceptors were reacted with various small substrates (H2O, NH3, NH2R, NHR2, NH2NH2 and NH2NH3(1+)) capableof simultaneously coordinating to the Pd center and hydrogen-bonding with the peripheral ether oxygens. (Pd(L(3))(NH3)][BF4] crystallized in the space group Pbca with a = 21.377(4) A, b = 21.656(5) A, c = 9.437(6) A, V = 4368(2) A**3, and Z = 8. The structure refined to R = 6.41% and Rw = 7.03% for 659 reflections with Fo**2 > 3sigma(Fo**2). [Pd(L(3))(NH2NH2)][BF4] crystallized in the space group P1- with a = 11.652(3) A, b = 12.669(4) A, c = 8.356(1) A, alpha = 94.13(2)¡ã, beta = 94.34(2)¡ã, gamma = 117.21(1)¡ã, V=1090.3(5) A**3 and Z = 2. The structure refined to R = 2.81% and Rw= 3.40% for 2709 reflections with Fo**2 > 3sigma(Fo**2). [Pd(L(5))(H2O)][BF4] crystallized in the space group P1- with a = 11.076(3) A, b= 15.147(5) A, c = 8.586(2) A, V = 1284(1) A**3, and Z = 2.The structure refined to R = 3.14% and Rw = 4.06% for 2275 reflections with Fo**2 > 3sigma(Fo**2). [Pd(L(3) )(NH2NH3)][CF3SO3]2 crystallized in the space group P21/c with a = 11.906(4) A, b = 17.19(1) A, c= 15.313(4) A, beta = 111.18(2)¡ã, V = 2923(4) A**3, and Z = 4. The structure refined to R = 3.13% and Rw = 4.25% for 2954 reflections with Fo**2 > 3sigma(Fo**2). [Pd(L(5))(NH2NH3)][BF4]2 crystallized in the space group P1- with a = 9.391(3) A, b = 18.292(5) A,c = 9.107(2) A, alpha = 94.46(3)¡ã, beta = 102.02(2)¡ã, gamma = 103.51(2)¡ã, V = 1474.5(8) A**3, and Z = 2. Thestructure refined to R = 3.69% and Rw = 4.58% for 3059 reflections withFo**2 > 3sigma(Fo**2). Each complex shows evidence of hydrogen bonding between the Pd-bound substrate and the peripheral oxygen atoms. The major hydrogen-bonding sites are the oxygen atoms adjacent to the thioether atoms, while the extent of the hydrogen bonding is dependent on the size of the polyether ring and the orientation of the substrate. Controlling the number of hydrogen bonds formed results in selective binding of primary amines (two hydrogen bonds) over secondary amines (one hydrogen bond) and tertiary amines (no hydrogen bonds) as determined by competition reactions monitored by (1)H NMR spectroscopy.

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Reference£º
Chapter 1 An introduction to palladium catalysis,
Palladium/carbon catalyst regeneration and mechanical application method