Category: 1038-95-5

Related Products of 1038-95-5. Chemistry is an experimental science, and the best way to enjoy it and learn about it is performing experiments.Introducing a new discovery about 1038-95-5, Name is Tri-p-tolylphosphine

The formation of dinuclear trichloro-bridged and mononuclear ruthenium complexes from the reactions of dichlorotris(p-tolylphosphine)ruthenium(II) with diazabutadiene ligands

Ru(II) complexes with diazabutadiene (R-DAB) ligands have been prepared. The reaction of RuCl3·nH2O with P(p-tolyl)3 gave a [RuCl2{P(p-tolyl)3}] precursor, whose reactions with R-DAB in toluene gave dinuclear trichloro-bridged Ru(II) complexes [Ru2Cl3(P(p-tolyl)3)2(R-DAB)2](BF4) which have been characterized by spectroscopic methods. In addition, one of the complexes was characterized using X-ray crystallography. Meanwhile, two mononuclear Ru(II) complexes [RuCl2(P(p-tolyl)3)2(R-DAB)] were obtained from the reactions of the [RuCl2{P(p-tolyl)3}] precursor with R-DAB ligands in THF. The two trans-mononuclear complexes were characterized by X-ray crystallography and solid-state 31P NMR. A temperature-dependent 31P NMR study was carried out to monitor the formation of dinuclear and mononuclear complexes.

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Reference：
Phosphine ligand,
Chiral phosphine ligands in asymmetric synthesis. Molecular structure and absolute configuration of (1,5-cyclooctadiene)-(2S,3S)-2,3-bis(diphenylphosphino)butanerhodium(I) perchlorate tetrahydrofuran solvate

Application of 1038-95-5, Children learn through play, and they learn more than adults might expect. Science experiments are a great way to spark their curiosity, get their minds active, and encourage them to do something that doesn’t involve a screen. 1038-95-5, C21H21P. A document type is Article, introducing its new discovery.

Arene carbonyl rhodium(I) complexes

The arene carbonyl rhodium complexes PF6 and PF6 have been prepared by treating the dimeric complexes, 2 with AgPF6 in the presence of hexamethylbenzene.The reaction of PF6 with tetrafluorobenzobarrelene affords PF6.On the other hand, the reaction of PF6 with a stoichiometric amount of triphenylphosphine gives PF6 (arene = C6Me6 or C6H3Me3), whereas with excess of this ligand PF6 is formed.The related PF6derivative has also been prepared.The reactivity of both hexamethylbenzene carbonyl rhodium complexes has been examined.The addition of bipyridine to solutions of PF6 (L = CO or PPh3) causes the immediate displacement of the coordinated hexamethylbenzene.Their reactions with the nucleophiles, acetylacetone, tropolonate, or pyrazolate in the presence of triethylamine afford neutral derivatives of the type x (L = CO or PPh3; A = acac or trop, x = 1; A = pz, x = 2).

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Reference：
Phosphine ligand,
Chiral phosphine ligands in asymmetric synthesis. Molecular structure and absolute configuration of (1,5-cyclooctadiene)-(2S,3S)-2,3-bis(diphenylphosphino)butanerhodium(I) perchlorate tetrahydrofuran solvate

Electric Literature of 1038-95-5, Children learn through play, and they learn more than adults might expect. Science experiments are a great way to spark their curiosity, get their minds active, and encourage them to do something that doesn’t involve a screen. 1038-95-5, C21H21P. A document type is Article, introducing its new discovery.

Convenient Preparation of Tetraarylphosphonium Halides

Tetraarylphosphonium halides, particularly iodides, can be conveniently prepared by the Pd-catalyzed reaction of aryl halides and triarylphosphines in good yields.

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Reference：
Phosphine ligand,
Chiral phosphine ligands in asymmetric synthesis. Molecular structure and absolute configuration of (1,5-cyclooctadiene)-(2S,3S)-2,3-bis(diphenylphosphino)butanerhodium(I) perchlorate tetrahydrofuran solvate

Electric Literature of 1038-95-5. Chemistry is an experimental science, and the best way to enjoy it and learn about it is performing experiments.Introducing a new discovery about 1038-95-5, Name is Tri-p-tolylphosphine

Effect of Ligand Electronics on the Reversible Catalytic Hydrogenation of CO2 to Formic Acid Using Ruthenium Polyhydride Complexes: A Thermodynamic and Kinetic Study

Hydrogenation of CO2 to formic acid or formates is often carried out using catalysts of the type H4Ru(PR3)3 (1). These catalysts are also active for the reverse reaction, i.e., the decomposition of formic acid to H2 and CO2. While numerous catalysts have been synthesized for reactions in both directions, the factors controlling the elementary steps of the catalytic cycle remain poorly understood. In this work, we synthesize a series of compounds of type H4Ru(P(C6H4R)3)3 containing both electron-donating and electron-withdrawing groups and analyze their influence on the kinetic and thermodynamic parameters of CO2 insertion and deinsertion. The data are correlated with the catalytic performance of the complexes through linear free-energy relationships. The results show that formic acid dissociation from the catalyst is rate-determining during CO2 hydrogenation, while deinsertion is critical for the decomposition reaction.

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Reference：
Phosphine ligand,
Chiral phosphine ligands in asymmetric synthesis. Molecular structure and absolute configuration of (1,5-cyclooctadiene)-(2S,3S)-2,3-bis(diphenylphosphino)butanerhodium(I) perchlorate tetrahydrofuran solvate

The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature.1038-95-5, Name is Tri-p-tolylphosphine, molecular formula is C21H21P. In a Article，once mentioned of 1038-95-5, Safety of Tri-p-tolylphosphine

Cycloaddition of dialkyl (E)-hex-2-en-4-ynedioates to [60]fullerene by phosphane-promoted tandem alpha(delta’)-Michael additions

Organophosphanes promote the [3+2] cycloaddition reactions of dialkyl (E)-hex-2-en-4-ynedioates and [60]fullerene, giving a series of cyclopenteno-fullerenes 3a-k bearing phosphorus ylides. This cycloaddition reaction is initiated by the attack of nucleophilic phosphanes at the alpha(delta’)-C atom of the dialkyl (E)-hex-2-en-4-ynedioate, which generates a 1,3-dipolar species. These 1,3-dipoles then react with C 60 followed by intramolecular cyclization to give cyclopenteno-fullerenes in moderate-to-good yields. In a cyclic voltmmetry study, these novel fullerenes show a larger cathodic shift in their first reduction potential relative to [6,6]phenyl-C61 methyl butyrate, which indicates that these new derivatives possess higher LUMO energy levels.

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Reference：
Phosphine ligand,
Chiral phosphine ligands in asymmetric synthesis. Molecular structure and absolute configuration of (1,5-cyclooctadiene)-(2S,3S)-2,3-bis(diphenylphosphino)butanerhodium(I) perchlorate tetrahydrofuran solvate

A catalyst don’t appear in the overall stoichiometry of the reaction it catalyzes, but it must appear in at least one of the elementary reactions in the mechanism for the catalyzed reaction. 1038-95-5, Name is Tri-p-tolylphosphine, molecular formula is C21H21P. In a Article，once mentioned of 1038-95-5, Application In Synthesis of Tri-p-tolylphosphine

Quenching of a photosensitized dye through single-electron transfer from trivalent phosphorus compounds

Various types of trivalent phosphorus compounds 1 undergo single-electron transfer (SET) to the photoexcited state of rhodamine 6G (Rho+(*)) in aqueous acetonitrile to quench the fluorescence from Rho+(*). The rate constants k(p) for the overall SET process were determined by the Stern-Volmer method. The rate is nearly constant at a diffusion-controlled limit in the region of E( 1/2 )(1) < 1.3 V (vs Ag/Ag+), whereas log k(p) depends linearly on E( 1/2 )(1) in the region of E( 1/2 )(1) > 1.3 V, the slope of the correlation line being -alphaF/RT with alpha = 0.2. The potential at which the change in dependence of log k(p) on E( 1/2 )(1) occurs (1.3 V) is in accordance with the value of E( 1/2 )(Rho+(*)) (1.22 V) that has been obtained experimentally. Thus, the SET step is exothermic when E( 1/2 )(1) < 1.3 V and endothermic when E( 1/2 )(1) > 1.3 V. The alpha-value (0.2) obtained in the endothermic region shows that the SET step from 1 to Rho+(*)is irreversible in this region. Trivalent phosphorus radical cation 1(·+) generated in the SET step undergoes an ionic reaction with water in the solvent rapidly enough to make the SET step irreversible. In contrast, the SET from amines 2 and alkoxybenzenes 3 to Rho+(*) is reversible when the SET step is endothermic, meaning that the radical cations 2(·+) and 3(·+) generated in the SET step undergo rapid ‘back SET’ in the ground state to regenerate 2 and 3.

Balanced chemical reaction does not necessarily reveal either the individual elementary reactions by which a reaction occurs or its rate law.Application In Synthesis of Tri-p-tolylphosphine. In my other articles, you can also check out more blogs about 1038-95-5

Reference：
Phosphine ligand,
Chiral phosphine ligands in asymmetric synthesis. Molecular structure and absolute configuration of (1,5-cyclooctadiene)-(2S,3S)-2,3-bis(diphenylphosphino)butanerhodium(I) perchlorate tetrahydrofuran solvate

Application of 1038-95-5. Let’s face it, organic chemistry can seem difficult to learn. Especially from a beginner’s point of view. Like 1038-95-5, Name is Tri-p-tolylphosphine. In a document type is Article, introducing its new discovery.

Effects of Cyclopentadienyl and Phosphine Ligands on the Basicities and Nucleophilicities of Cp’Ir(CO)(PR3) Complexes

Basicities of the series of complexes CpIr(CO)(PR3) [PR3 = P(p-C6H4CF3)3 P(p-C6H4F)3, P(p-C6H4Cl)3, PPh3, P(p-C6H4CH3)3, P(p-C6H4OCH3)3, PPh2Me, PPhMe2, PMe3, PEt3, PCy3] have been measured by the heat evolved (DeltaHHM) when the complex is protonated by CF3SO3H in 1,2-dichloroethane (DCE) at 25.0 C. The -DeltaHHM values range from 28.0 kcal/mol for CpIr(CO)[P(p-C6H4CF3)3] to 33.2 kcal/mol for CpIr(CO)(PMe3) and are directly related to the basicities of the PR3 ligands in the complexes. For the more basic pentamethylcyclopentadienyl analogs, the -DeltaHHM values range from 33.8 kcal/mol for the weakest base Cp*Ir(CO)[P(p-C6H4CF3)3] to 38.0 kcal/mol for the strongest Cp*Ir(CO)(PMe3). The nucleophilicities of the Cp’Ir(CO)(PR3) complexes were established from second-order rate constants (k) for their reactions with CH3I to give [Cp’Ir(CO)(PR3)(CH3)]+I- in CD2Cl2 at 25.0 C. There is an excellent linear correlation between the basicities (DeltaHHM) and nucleophilicities (log k) of the CpIr(CO)(PR3) complexes. Only the complex CpIr(CO)(PCy3) with the bulky tricyclohexylphosphine ligand deviates dramatically from the trend. In general, the pentamethylcyclopentadienyl complexes react 40 times faster than the cyclopentadienyl analogs. However, they do not react as fast as predicted from electronic properties of the complexes, which suggests that the steric size of the Cp* ligand reduces the nucleophilicities of the Cp*Ir(CO)(PR3) complexes. In addition, heats of protonation (DeltaHHP) of tris(2-methoxyphenyl)phosphine, tris(2,6-dimethoxyphenyl)phosphine, and tris(2,4,6-trimethylphenyl)phosphine were measured and used to estimate pKa values for these highly basic phosphines.

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Reference：
Phosphine ligand,
Chiral phosphine ligands in asymmetric synthesis. Molecular structure and absolute configuration of (1,5-cyclooctadiene)-(2S,3S)-2,3-bis(diphenylphosphino)butanerhodium(I) perchlorate tetrahydrofuran solvate

Electric Literature of 1038-95-5, Catalysts are substances that increase the reaction rate of a chemical reaction without being consumed in the process. 1038-95-5, Name is Tri-p-tolylphosphine, molecular formula is C21H21P. In a Article，once mentioned of 1038-95-5

Synthesis and structure-activity analysis of new phosphonium salts with potent activity against African trypanosomes

A series of 73 bisphosphonium salts and 10 monophosphonium salt derivatives were synthesized and tested in vitro against several wild type and resistant lines of Trypanosoma brucei (T. b. rhodesiense STIB900, T. b. brucei strain 427, TbAT1-KO, and TbB48). More than half of the compounds tested showed a submicromolar EC50 against these parasites. The compounds did not display any cross-resistance to existing diamidine therapies, such as pentamidine. In most cases, the compounds displayed a good selectivity index versus human cell lines. None of the known T. b. brucei drug transporters were required for trypanocidal activity, although some of the bisphosphonium compounds inhibited the low affinity pentamidine transporter. It was found that phosphonium drugs act slowly to clear a trypanosome population but that only a short exposure time is needed for irreversible damage to the cells. A comparative molecular field analysis model (CoMFA) was generated to gain insights into the SAR of this class of compounds, identifying key features for trypanocidal activity.

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Reference：
Phosphine ligand,
Chiral phosphine ligands in asymmetric synthesis. Molecular structure and absolute configuration of (1,5-cyclooctadiene)-(2S,3S)-2,3-bis(diphenylphosphino)butanerhodium(I) perchlorate tetrahydrofuran solvate

Reference of 1038-95-5, Chemistry can be defined as the study of matter and the changes it undergoes. You’ll sometimes hear it called the central science because it is the connection between physics and all the other sciences, starting with biology.1038-95-5, Name is Tri-p-tolylphosphine, molecular formula is C21H21P. In a patent, introducing its new discovery.

Metal-heterocyclic thione interactions. 13. Pyridine-2-thione derivatives of copper(I): Crystal structure of dinuclear [bromo(pyridine-2-thione)(tri-p-tolylphosphine)copper(I)]2 complex

The sulfur-bridged dinuclear copper (I) complex, [CuBr(eta2-S-mu-C5H5NS) (p-Tol3P)]2 (1) was prepared by the reaction of insoluble CuBr2(C5H5NS)2 {from copper(II) bromide and pyridine-2-thione(C5H5NS) in ethanol} with excess tri-p-tolylphosphine (p-Tol3P) in chloroform (1:2 mole ratio). Similarly, other copper(I) complexes of stoichiometry [CuX(C5H5NS)(Ph3P)]2 {X = Cl, 2 and 1, 3} were prepared. Compound 1 crystallised from a dichloromethane-chloroform-methanol mixture and exists as a centrosymmetric sulfur-bridged dimer with distorted tetrahedral geometry about each Cu atom; the other two positions of each Cu atom being occupied by a P atom from p-Tol3P and a bromine atom. The central core Cu2S2 of the dimer is a parallelogram with the important interatomic parameters as follows: Cu-P, 2.2376(13), Cu-S, 2.3895(19), 2.415(2), Cu-Br, 2.4455(11), S-C(2), 1.717(4), Cu-Cu*, 3.250(2), S-S*, 3.539(3) A?; Cu-S-Cu*, 85.14(6), S-Cu-S*, 94.86(6), Cu-S-C(2), 108.41(14), 113.12(16). The dimer structure is stabilised by strong intramolecular N-H···Br hydrogen bonds [3.319(5) A?]. The X-ray study of 2 showed that it has transformed into monomer [CuCl(eta1-S-mu-C5H5NS) (Ph3P)2] (4) during crystal growth. The strong intramolecular N-H···Cl hydrogen bonding appears to stabilise the monomer. All the compounds were characterised using analytical data, IR and far-IR (4000-100 cm-1), UV-Vis spectra, NMR (1H, 13C) and for 1 and 4 using X-ray crystallography. The factors controlling Cu···Cu interaction in the sulfur-bridged dinuclear copper(I)-heterocyclic thione complexes are described.

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Reference：
Phosphine ligand,
Chiral phosphine ligands in asymmetric synthesis. Molecular structure and absolute configuration of (1,5-cyclooctadiene)-(2S,3S)-2,3-bis(diphenylphosphino)butanerhodium(I) perchlorate tetrahydrofuran solvate

In an article, published in an article, once mentioned the application of 1038-95-5, Name is Tri-p-tolylphosphine,molecular formula is C21H21P, is a conventional compound. this article was the specific content is as follows.category: chiral-phosphine-ligands

Comprehensive investigation on the reactivity of triarylphosphine radical cations by laser flash photolysis time-resolved UV?Vis spectroscopy

Laser flash photolysis at 266 nm was carried out on the acetonitrile solution of triarylphosphines, Ar3P, using a Nd YAG laser under oxygen, air, and argon atmospheres by varying the Ar3P concentration. The spectral change was monitored by time-resolved UV?Vis spectroscopy. A transient absorption that appeared on the TRUV spectrum within 100 ns after the laser flash was judged to result from the triarylphosphine radical cation, Ar3P?+, based on a comparison with previously reported spectra. The absorption decayed on a time scale of microseconds according to the first-order kinetics, in which the first-order rate constant, kobs, is expressed by kobs = kO2[O2] + kAr[Ar3P] + ks. The first term in this expression represents the radical coupling of Ar3P?+ with O2, whereas the second term likely results from an ionic reaction of Ar3P?+ with the parent phosphine. This finding suggests that Ar3P?+ undergoes either a radical coupling with oxygen or an ionic reaction with Ar3P to decay. Copyright

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Reference：
Phosphine ligand,
Chiral phosphine ligands in asymmetric synthesis. Molecular structure and absolute configuration of (1,5-cyclooctadiene)-(2S,3S)-2,3-bis(diphenylphosphino)butanerhodium(I) perchlorate tetrahydrofuran solvate