Tag: M.W:400-500

Application of 13991-08-7, An article , which mentions 13991-08-7, molecular formula is C30H24P2. The compound – 1,2-Bis(diphenylphosphino)benzene played an important role in people’s production and life.

A series of phosphine-diphenylphosphenium donor-acceptor cationic complexes have been synthesized and comprehensively characterized (phosphine = diphenylchlorophosphine, triphenylphosphine, trimethylphosphine, and tricyclohexylphosphine). The complexes involve homoatomic P-P coordinate bonds that are susceptible to ligand exchange reactions highlighting a versatile new synthetic method for P-P bond formation. Phosphenium complexes of 1,2-bis(diphenylphosphino)benzene and 1,2-bis(tert-butylphosphino)benzene undergo unusual rearrangements to give a “segregated” diphosphine-phosphonium cation and a cyclic di(phosphino)phosphonium cation, respectively. The rearrangement products reveal the kinetic stability of the phosphine-phosphenium bonding arrangement.

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Reference£º
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

Chemistry is an experimental science, and the best way to enjoy it and learn about it is performing experiments.Introducing a new discovery about 657408-07-6, Name is Dicyclohexyl(2′,6′-dimethoxy-[1,1′-biphenyl]-2-yl)phosphine, Safety of Dicyclohexyl(2′,6′-dimethoxy-[1,1′-biphenyl]-2-yl)phosphine.

The invention is concerned with the compounds of formula (I): and pharmaceutically acceptable salts thereof, wherein R1, R2, R3 and X are defined in the detailed description and claims. In addition, the present invention relates to methods of manufacturing and using the compounds of formula I as well as pharmaceutical compositions containing such compounds. The compounds of formula I are antagonists or partial agonists at the CRTH2 receptor and may be useful in treating diseases and disorders associated with that receptor such as asthma.

Balanced chemical reaction does not necessarily reveal either the individual elementary reactions by which a reaction occurs or its rate law.Safety of Dicyclohexyl(2′,6′-dimethoxy-[1,1′-biphenyl]-2-yl)phosphine. In my other articles, you can also check out more blogs about 657408-07-6

Reference£º
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 13991-08-7, Name is 1,2-Bis(diphenylphosphino)benzene,molecular formula is C30H24P2, is a conventional compound. this article was the specific content is as follows.Recommanded Product: 1,2-Bis(diphenylphosphino)benzene

Hydrogen-activating models of hydrogenases

Hydrogenases are biological catalysts for hydrogen evolution and activation. While many model complexes of hydrogenases can catalyze the hydrogen evolution reaction, few of them can react with hydrogen. Here we review the hydrogen-activating models of hydrogenases, in particular, [NiFe]- and [FeFe]-hydrogenases. The mechanism of these reactions is 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

Electric Literature of 13406-29-6. Let’s face it, organic chemistry can seem difficult to learn. Especially from a beginner’s point of view. Like 13406-29-6, Name is Tris(4-(trifluoromethyl)phenyl)phosphine. In a document type is Article, introducing its new discovery.

New chiral cyclopentadienylrhenium lewis acids featuring fluorinated triarylphosphanes and enhanced acceptor abilities – An unusual carbon-fluorine bond activation in a metal coordination sphere

The acetonitrile complex [(eta5-C5H5)Re(NO)(NCCH3)(CO)] +BF4- (1) and P(4-C6H4CF3)3 slowly react (2 d, room temperature) to give the substitution product [(eta5-C5H5)Re(NO){P(4-C6H 4CF3)3}(CO)]+BF4 – (3, 85%). The reaction of 1 and less nucleophilic P(C6F5)3 must be conducted in a melt at 140C, but [(eta5-C5H5)Re(NO){P(C6F 5)3}(CO)]+BF4- (11) is isolated in 90% yield. Reduction of 3 by NaBH4 gives the methyl complex (eta5-C5H5)Re(NO){P(4-C6H 4CF3)3}(CH3), which is treated with TfOH and H3CN=C(H)C6H5 to give the imine complex [(eta5-C5H5)Re(NO)(PPh3){N(CH 3)=C(H)C6H5}]+TfO- (9). Complex 9 was, like the non-fluorinated analog, unreactive towards allyltin nucleophiles. Complex 11 should lead to a more reactive imine complex, but NaBH4 gave a methyl complex that was difficult to purify. However, NaOCH3 or NaSCH3/methanol gave easily purified (eta5-C5H5)Re(NO){P(4-C6F 4OCH3)3}(CO2CH3) (85%) or (eta5-C5H5)Re(NO){P(4-C6F 4SCH3)3}(CO2CH3) (51%), in which all para-fluorine atoms have undergone nucleophilic displacements, and the carbonyl ligands methoxide additions. This suggests that catalytic chemistry of the chiral Lewis acid [(eta5-C5H5)Re(NO){P(C6F 5)3}]+(I-F15) will be complicated by nucleophilic degradation. Nonetheless, density functional calculations show that I-F15 is a much stronger sigma acceptor and weaker pi donor than less fluorinated analogs.

If you are interested in 13406-29-6, you can contact me at any time and look forward to more communication.Electric Literature of 13406-29-6

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. 97239-80-0, Name is 1,1′-Bis(diisopropylphosphino)ferrocene, molecular formula is C22H28FeP2. In a Article，once mentioned of 97239-80-0, name: 1,1′-Bis(diisopropylphosphino)ferrocene

Ambi-valence taken literally: Ruthenium vs iron oxidation in (1,1?-diphosphinoferrocene)ruthenium(II) hydride and chloride complexes as deduced from spectroelectrochemistry of the heterodimetallic “mixed-valent” intermediates

Combining two different redox-active organometallic moieties, we prepared the compounds [(Cym)RuCl(dpf)](PF6), with Cym = p-cymene = 1-isopropyl-4-methylbenzene, and the diphosphinoferrocenes (dpf) 1,1?-bis(diphenylphosphino)ferrocene (dppf; complex 3), 1,1?-bis(diisopropylphosphino)ferrocene (dippf; complex 4), and 1,1?-bis(diethylphosphino)ferrocene (depf; complex 5) as well as the structurally characterized hydride complex [(C5Me5) RuH(dippf)] (2). In contrast to the case for 2, with an approximately staggered ferrocene conformation, the chloride complexes 3-5 exhibit a syn-periplanar ferrocene arrangement due to a Cl…H(C5H4) interaction in the solid and in solution. The related new compounds [(Cym)RuH(dppf)](PF6) (6) and trinuclear (mu-dpf)[(Cym)RuCl 2)]2 (7-9) were also obtained and identified by 1H and 31P NMR spectroscopy. The redox behavior of 2-6 and of the known [(C5Me5)RuH(dppf)] (1) was investigated using cyclic voltammetry, spectroelectrochemistry in the UV/vis/near-IR and IR regions, and, in part, by EPR. The first oxidation of the areneruthenium compounds 3-6 occurs reversibly at the ferrocene site, while the reduction proceeds via an ECE two-electron pattern under chloride dissociation. These results are compared to those obtained for the pentamethylcyclopentadienide/ hydride complexes 1 and 2, which demonstrate unambiguously the ruthenium center as the site of the first electron loss. The different results for the two kinds of heterodimetallic d5/d6 mixed-valent intermediates, FeIIRuIII for 1+ and 2+ and Fe IIIRuII for 3+-6+, are discussed with respect to the possible uses of such heterodinuclear systems in H 2 conversion catalysis.

Balanced chemical reaction does not necessarily reveal either the individual elementary reactions by which a reaction occurs or its rate law.name: 1,1′-Bis(diisopropylphosphino)ferrocene. In my other articles, you can also check out more blogs about 97239-80-0

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

13991-08-7, Name is 1,2-Bis(diphenylphosphino)benzene, molecular formula is C30H24P2, belongs to chiral-phosphine-ligands compound, is a common compound. In a patnet, once mentioned the new application about 13991-08-7, Quality Control of: 1,2-Bis(diphenylphosphino)benzene

Softening the donor set for light-emitting electrochemical cells: [Ir(ppy)2(N^N)]+, [Ir(ppy)2(P^P)]+ and [Ir(ppy)2(P^S)]+ salts

The syntheses and solution characterizations of [Ir(ppy) 2(1)][PF6] (1 = 4,4?-di(2-furanyl)-6,6?- dimethyl-2,2?-bipyridine), [Ir(ppy)2(dppe)][PF6] (dppe = 1,2-bis(diphenylphosphino)ethane), [Ir(ppy)2(2)][PF 6] (2 = 1,2-bis(diphenylphosphino)benzene) and [Ir(ppy) 2(3)][PF6] (3 = 2-diphenylphosphinothioanisole) are reported. Solutions of the iridium(III) complexes incorporating 1, 2 and dppe are photoluminescent, but [Ir(ppy)2(3)][PF6] is non-emissive. The single crystal structures of [Ir(ppy)2(1)][PF 6]·2CH2Cl2, [Ir(ppy)2(dppe)] [PF6], 4[Ir(ppy)2(2)][PF6]·3CH 2Cl2 and [Ir(ppy)2(3)][PF6] have been determined, and the role of inter-ligand face-to-face pi-stacking (a means of suppressing emission quenching) in the [Ir(ppy)2(dppe)] +, [Ir(ppy)2(2)]+ and [Ir(ppy) 2(3)]+ cations is assessed.

Balanced chemical reaction does not necessarily reveal either the individual elementary reactions by which a reaction occurs or its rate law.Quality Control of: 1,2-Bis(diphenylphosphino)benzene. In my other articles, you can also check out more blogs about 13991-08-7

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.657408-07-6, Name is Dicyclohexyl(2′,6′-dimethoxy-[1,1′-biphenyl]-2-yl)phosphine, molecular formula is C26H35O2P. In a Patent，once mentioned of 657408-07-6, name: Dicyclohexyl(2′,6′-dimethoxy-[1,1′-biphenyl]-2-yl)phosphine

PHOSPHORESCENT HETEROLEPTIC PHENYLBENZIMIDAZOLE DOPANTS AND NEW SYNTHETIC METHODOLOGY

Novel heteroleptic iridium complexes are provided. These iridium complexes are useful compounds in OLED devices. The ligands for these novel complexes may be obtained using a new synthetic methodology that utilizes manganese dioxide.

Note that a catalyst decreases the activation energy for both the forward and the reverse reactions and hence accelerates both the forward and the reverse reactions.name: Dicyclohexyl(2′,6′-dimethoxy-[1,1′-biphenyl]-2-yl)phosphine, you can also check out more blogs about657408-07-6

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. 13991-08-7, Name is 1,2-Bis(diphenylphosphino)benzene, molecular formula is C30H24P2. In a Article，once mentioned of 13991-08-7, COA of Formula: C30H24P2

Isolation and Structural Characterisation of Monoprotonated 1,2-Bis(diphenylphosphino)benzene in its Tetrabromogallate(III) Salt

Hydrolysis of gallium tribromide complexes of 1,2-bis(diphenylphosphino)benzene in toluene solvent affords crystals of the mono-phosphonium salt [1,2-Ph2P-(C6H4)-PPh2H]+ [GaBr4]-. The structure analysis by single crystal X-ray diffraction allows an internal comparison of Ph2P phosphino and Ph2PH+ phosphonium functions.

Sometimes chemists are able to propose two or more mechanisms that are consistent with the available data.COA of Formula: C30H24P2, If a proposed mechanism predicts the wrong experimental rate law, however, the mechanism must be incorrect.Welcome to check out more blogs about 13991-08-7, in my other articles.

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. 13991-08-7, Name is 1,2-Bis(diphenylphosphino)benzene, molecular formula is C30H24P2. In a Article，once mentioned of 13991-08-7, category: chiral-phosphine-ligands

Process design and scale-up of the synthesis of 2,2?:5?,2?-terthienyl

The objective of this study was the design of a scaleable process for the synthesis of 3-4 mol of alpha-terthienyl from 2,5-dibromothiophene and thienylmagnesium bromide in a 10-L stirred tank reactor. In THF the Grignard reagent, thienylmagnesium bromide, was readily formed from 2-bromothiophene and magnesium. To avoid crystallization the maximal concentration was limited to 1.4 M. Furthermore, the novel combination of THF and NiCl2[bis(diphenylphosphino)benzene] allows for fast double coupling of the Grignard reagent with 2,5-dibromothiophene. The concentration of catalyst could be limited to 0.5 mol % based on the amount of 2,5-dibromothiophene. An adapted workup procedure was developed, in which n-octane was used to separate the magnesium salts from the desired product. The reaction was performed in a (semi)batch-wise operated reactor. A global model for the coupling step proved to predict the results at 0.1-, 1-, and 10-L scales very accurately. The heat of reaction evolved in the coupling step was valorized and could be handled easily. Mixing of the feed stream and the reactor content proved to be another important factor in the scaling-up of the alpha-terthienyl synthesis.

Sometimes chemists are able to propose two or more mechanisms that are consistent with the available data.category: chiral-phosphine-ligands, If a proposed mechanism predicts the wrong experimental rate law, however, the mechanism must be incorrect.Welcome to check out more blogs about 13991-08-7, in my other articles.

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 13406-29-6, 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. 13406-29-6, C21H12F9P. A document type is Article, introducing its new discovery.

Reactions of 2,4-hexadiyne-1,6-diol with [H2Os 3(CO)9(PR3)] clusters. Cyclization of the diyne and reversible exchange of the phosphine ligands between different positions of the “Os3C3” framework

Reactions between unsaturated [H2Os3(CO) 9(PR3)] clusters (PR3 = PPh3, P(4-CF3-C6H4)3, PEt3) and 2,4-hexadiyne-1,6-diol have been studied. It was found that the diyne ligand easily reacts with all these complexes to give [HOs3(CO) 8(PR3){mu3,eta1 : eta3 : eta1-(CH3-C-C=CH-CH=C-O)}] complexes (V, VI and VII, respectively) containing the “Os3C 3” pentagonal pyramid cluster framework. This structural pattern is formed through the diyne cyclization, dissociation of a CO ligand and eventual coordination of the cyclized organic moiety to the osmium triangle in the mu3,eta1 : eta3 : eta1 manner. In the case of the PEt3 substituted cluster the second hydride transfer onto the organic fragment occurs to afford the nonhydride [Os3(CO)8 (PR3) {mu3, eta1 : eta2 : eta1-(CH 3-CH-C=CH-CH=C-O)}] cluster, VIII, containing distorted pentagonal pyramid framework with a broken Os-C bond. Heating of V, VI and VII in hexane solutions results in formation of the regioisomers (Va, VIa and VIIa) with the phosphine ligand located at adjacent osmium atoms across the Os-Os bond bridged by the coordinated organic fragment. The most probable mechanism of the isomerization includes reversible phosphine migration between these metal centres. Solid-state structure of V, Va, VI, VIIa and VIII have been established by single crystal Xray diffraction. A general mechanistic scheme for the diyne ligand cyclization and cluster framework transformations is suggested and discussed.

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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