Tag: M.W:500-600

The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature.161265-03-8, Name is (9,9-Dimethyl-9H-xanthene-4,5-diyl)bis(diphenylphosphine), molecular formula is C39H32OP2. In a Article，once mentioned of 161265-03-8, Formula: C39H32OP2

Variation of xantphos-based ligands in the palladium-catalyzed reaction of aryl halides with ureas

A series of Xantphos-based ligands containing various substituents in the diphenylphosphino groups were synthesized, and their effect on the product yield and ratio in the palladium-catalyzed arylation of ureas with nonactivated aryl halides was studied. The arylation of urea and phenylurea in the presence of Pd2(dba)3-CHCl3, 3,5-(CF3) 2Xantphos, and Cs2CO3 in dioxane at 100C gave the corresponding N,N?-diarylureas in 62-98% yield.

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.Formula: C39H32OP2, you can also check out more blogs about161265-03-8

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 161265-03-8. Chemistry is an experimental science, and the best way to enjoy it and learn about it is performing experiments.Introducing a new discovery about 161265-03-8, Name is (9,9-Dimethyl-9H-xanthene-4,5-diyl)bis(diphenylphosphine)

Visible-Light-Driven, Copper-Catalyzed Decarboxylative C(sp3)?H Alkylation of Glycine and Peptides

Despite a well-developed and growing body of work in Cu catalysis, the potential of Cu to serve as a photocatalyst remains underexplored. Reported herein is the first example of visible-light-induced Cu-catalyzed decarboxylative C(sp3)?H alkylation of glycine for preparing alpha-alkylated unnatural alpha-amino acids. It merits mentioning that the mild conditions and the good functional-group tolerance allow the modification of peptides using this method. The mechanistic studies revealed that a radical?radical coupling pathway is involved in the 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

161265-03-8, Name is (9,9-Dimethyl-9H-xanthene-4,5-diyl)bis(diphenylphosphine), molecular formula is C39H32OP2, belongs to chiral-phosphine-ligands compound, is a common compound. In a patnet, once mentioned the new application about 161265-03-8, Formula: C39H32OP2

In-situ oxidation, addition and cyclization reaction of 5,6-diamino-1,10-phenanthroline to construct copper(I)-diimine-diphosphine complexes

Reaction of 5,6-diamino-1,10-phenanthroline (dap), chelating diphosphine ligands, 9,9-dimethyl-4,5-bis(diphenylphosphino)-9H-xanthene (xantphos) and bis[(2-diphenylphosphino)phenyl] ether (POP) with [Cu(MeCN)4]ClO4 afforded mononuclear [Cu(dap)(PP)]ClO4 (PP = xantphos, 1a; POP, 2a), binuclear [Cu2(mu-pdi)(PP)2](ClO4)2 (pdi = 1,10-phenanthroline-5,6-diimine) (PP = xantphos, 1b; POP, 2b) and [Cu2(mu-ttpd)(xantphos)2](ClO4)2 (1c) (ttpd = 8b,9,18,18a-tetrahydrotetrapyrido[3,2-a:2?,3?-c:3?,2?-h:2?,3?-j]phenazine-8b,18a-diamine) complexes. The ligand pdi with a quinone diimine form in complexes 1b and 2b is suggested to result from an in-situ two-electron oxidation of dap under the catalysis of Cu(I) and is stabilized by the coordination to Cu(I) ion, while the unprecedented ligand ttpd in complex 1c is suggested to originate from the in-situ oxidation, addition and cyclization reaction of dap induced and stabilized by crystallized Cu(I)-diimine-diphosphine complex. The plausible formation mechanisms for the Cu(I) complexes are proposed.

Balanced chemical reaction does not necessarily reveal either the individual elementary reactions by which a reaction occurs or its rate law.Formula: C39H32OP2. In my other articles, you can also check out more blogs about 161265-03-8

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 161265-03-8. Let’s face it, organic chemistry can seem difficult to learn. Especially from a beginner’s point of view. Like 161265-03-8, Name is (9,9-Dimethyl-9H-xanthene-4,5-diyl)bis(diphenylphosphine). In a document type is Patent, introducing its new discovery.

HYDROGENATION OF ESTERS WITH RU/BIDENTATE LIGANDS COMPLEXES

The present invention relates to processes for the reduction by hydrogenation, using molecular H2, of a substrate containing one or two esters, or lactones, functional groups into the corresponding alcohol, or diol, said process is carried out in the presence of a base and at least one catalyst or pre-catalyst in the form of a ruthenium complex wherein the ruthenium is coordinated by a diphosphine bidentate ligand (PP ligand) and a diamino bidentate ligand (NN ligand) comprising at least one substituted alpha-carbon and one primary amine as one of the coordinating atoms.

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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

Related Products of 166330-10-5, 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. 166330-10-5, C36H28OP2. A document type is Article, introducing its new discovery.

Chimera diimine ligands in emissive [Cu(PP)(NN)][PF6] Complexes

The syntheses and characterizations of the chelating ligand 6-chloro-60-methyl-2,20-bipyridine (6-Cl-60-Mebpy) and of the copper(I) compounds [Cu(POP)(6-Cl-60-Mebpy)][PF6] and [Cu(xantphos) (6-Cl-60-Mebpy)][PF6] (POP = bis(2-(diphenylphosphanyl)phenyl)ether and xantphos = 4,5-bis (diphenylphosphanyl)-9,9-dimethyl-9H-xanthene) are described. The single crystal structures of both complexes were determined; the copper(I) ion is in a distorted tetrahedral environment and in [Cu(xantphos)(6-Cl-60-Mebpy)][PF6], the disorder of the 6-Cl-60-Mebpy ligand indicates there is no preference of the ‘bowl’-like cavity of the xanthene unit to host either the methyl or chloro-substituent, consistent with comparable steric effects of the two groups. The electrochemical and photophysical properties of [Cu(POP)(6-Cl-60-Mebpy)][PF6] and [Cu(xantphos)(6-Cl-60-Mebpy)][PF6] were investigated and are compared with those of the related compounds containing 6,60-dichloro-2,20-bipyridine or 6,60-dimethyl-2,20-bipyridine ligands. Trends in properties of the [Cu(PP)(NN)]+ complexes were consistent with 6-Cl-60-Mebpy behaving as a combination of the two parent ligands.

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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 161265-03-8. Chemistry is an experimental science, and the best way to enjoy it and learn about it is performing experiments.Introducing a new discovery about 161265-03-8, Name is (9,9-Dimethyl-9H-xanthene-4,5-diyl)bis(diphenylphosphine)

Ruthenium-Catalyzed C-C bond cleavage in lignin model substrates

Ruthenium-triphos complexes exhibited unprecedented catalytic activity and selectivity in the redox-neutral C-C bond cleavage of the beta-O-4 lignin linkage of 1,3-dilignol model compounds. A mechanistic pathway involving a dehydrogenation-initiated retro-aldol reaction for the C-C bond cleavage was proposed in line with experimental data and DFT calculations.

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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.12150-46-8, Name is 1,1-Bis(diphenylphosphino)ferrocene, molecular formula is C34H28FeP2. In a Article，once mentioned of 12150-46-8, Safety of 1,1-Bis(diphenylphosphino)ferrocene

Aryl-CF3 Coupling from Phosphinoferrocene-Ligated Palladium(II) Complexes

This article describes a detailed investigation of ligand effects on Ph-CF3 coupling from phosphinoferrocene-ligated PdII(Ph)(CF3) complexes. This study reveals that increasing the size of the phosphine substituents results in an enhanced rate of Ph-CF3 coupling, with (DtBPF)Pd(Ph)(CF3) (DtBPF = 1,1?-bis(di-tert-butylphosphino)ferrocene) being the most reactive complex. The mechanism of Ph-CF3 bond formation from both (DtBPF)Pd(Ph)(CF3) and (DiPrPF)Pd(Ph)(CF3) (DiPrPF = 1,1?-bis(diisopropylphosphino)ferrocene) was interrogated experimentally and computationally. These studies implicate a pathway involving concerted Ph-CF3 bond-forming reductive elimination from the four-coordinate PdII centers. An alternative pathway involving alpha-fluoride elimination and subsequent PhF2C-F coupling from PdII(CF2Ph)(F) intermediates was also evaluated but was ruled out based on DFT as well as the independent synthesis and reactivity studies of (DiPrPF)Pd(CF2Ph)(F).

The reactant in an enzyme-catalyzed reaction is called a substrate. Enzyme inhibitors cause a decrease in the reaction rate of an enzyme-catalyzed reaction.I hope my blog about 12150-46-8 is helpful to your research., Safety of 1,1-Bis(diphenylphosphino)ferrocene

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 166330-10-5, Name is (Oxybis(2,1-phenylene))bis(diphenylphosphine),molecular formula is C36H28OP2, is a conventional compound. this article was the specific content is as follows.name: (Oxybis(2,1-phenylene))bis(diphenylphosphine)

CF3 Substitution of [Cu(P^P)(bpy)][PF6] Complexes: Effects on Photophysical Properties and Light-Emitting Electrochemical Cell Performance

Herein, [Cu(P^P)(N^N)][PF6] complexes (P^P=bis[2-(diphenylphosphino)phenyl]ether (POP) or 4,5-bis(diphenylphosphino)-9,9-dimethylxanthene (xantphos); N^N=CF3-substituted 2,2?-bipyridines (6,6?-(CF3)2bpy, 6-CF3bpy, 5,5?-(CF3)2bpy, 4,4?-(CF3)2bpy, 6,6?-Me2-4,4?-(CF3)2bpy)) are reported. The effects of CF3 substitution on their structure as well as their electrochemical and photophysical properties are also presented. The HOMO?LUMO gap was tuned by the N^N ligand; the largest redshift in the metal-to-ligand charge transfer (MLCT) band was for [Cu(P^P){5,5?-(CF3)2bpy}][PF6]. In solution, the compounds are weak yellow to red emitters. The emission properties depend on the substitution pattern, but this cannot be explained by simple electronic arguments. Among powders, [Cu(xantphos){4,4?-(CF3)2bpy}][PF6] has the highest photoluminescence quantum yield (PLQY; 50.3 %) with an emission lifetime of 12 mus. Compared to 298 K solution behavior, excited-state lifetimes became longer in frozen Me-THF (77 K; THF=tetrahydrofuran), thus indicating thermally activated delayed fluorescence (TADF). Time-dependent (TD)-DFT calculations show that the energy gap between the lowest-energy singlet and triplet excited states (0.12?0.20 eV) permits TADF. Light-emitting electrochemical cells (LECs) with [Cu(POP)+(6-CF3bpy)][PF6], [Cu(xantphos)(6-CF3bpy)][PF6], or [Cu(xantphos){6,6?-Me2-4,4?-(CF3)2bpy}][PF6] emit yellow electroluminescence. The LEC with [Cu(xantphos){6,6?-Me2-4,4?-(CF3)2bpy}][PF6] had the fastest turn-on time (8 min), and the LEC with the longest lifetime (t1/2=31 h) contained [Cu(xantphos)(6-CF3bpy)][PF6]; these LECs reached maximum luminances of 131 and 109 cd m?2, respectively.

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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

Synthetic Route of 12150-46-8, Catalysts are substances that increase the reaction rate of a chemical reaction without being consumed in the process. 12150-46-8, Name is 1,1-Bis(diphenylphosphino)ferrocene, molecular formula is C34H28FeP2. In a Article，once mentioned of 12150-46-8

Novel types of tetra-, hexa-. octa-. and dodecanuclear silver clusters containing (2,7-Di-tert-butylfluoren-9-ylidene) methanedithiolate

The reaction of AgCIO4 with piperidinium 2,7-di-tert-butyl-9H- fluorene-9-carbodithioate (pipH)[S2C(t-Bu-Hfy)] (1) (t-Bu-Hfy = 2,7-di-tert-butylfluoren-9-yl) afforded [Agn{S2C(t-Bu-Hfy) }n] (2), which reacted with phosphines to give [Ag{S 2C(t-Bu-Hfy)}L2] [L = PPh3 (3a); L2 = bis(diphenylphosphino)ethane (dppe, 3b), 1,1?-bis(diphenylphosphino)- ferrocene (dppf, 3c). By reacting complex 2 with AgCIO4 and piperidine in a 1:1:1 molar ratio, the dodecanuclear cluster [Ag 12{S2C=(t-Bu-fy)}6] (4) (t-Bu-fy = 2,7-di-tert-butylfluoren-9-ylidene) was obtained. Compound 4 can also be directly prepared from the reaction of 1 with AgCIO4 and piperidine in a 1:2:1 molar ratio. The reactions of 1 with AgCIO4, phosphines, and piperidine afforded the compounds [Ag6{S2C=(t-Bu-fy)} 3L5] [1:2:2:1 molar ratio; L = PPh3 (5a), P(p-To)3 (5b)], [Ag4{S2C=(t-Bu-fy)} 2(dppf)2] (6) (1:2:1:1 molar ratio), [Ag n{S2C=(t-Bu-fy)}n/2{P(i-Pr)3} n] (7) (1:2:2:1 molar ratio), or [Ag8{S 2C=(t-Bu-fy)}4{P(i-Pr)3}4] (8) (1:2:1:1 molar ratio). Complexes 5a, b, 6, 7, and 8 can be also obtained by reacting 4 with the corresponding phosphine in the appropriate molar ratio. The crystal structures of 4, 5b, and 8 have been determined by X-ray diffraction studies. The nuclearity of complex 6 was established from its 31P{1H} NMR data, which reveal a very fast dynamic process leading to an average coupling of each of the P atoms of the dppf ligands with four Ag atoms.

The proportionality constant is the rate constant for the particular unimolecular reaction. the reaction rate is directly proportional to the concentration of the reactant. I hope my blog about 12150-46-8 is helpful to your research., Synthetic Route of 12150-46-8

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 166330-10-5, 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. 166330-10-5, C36H28OP2. A document type is Article, introducing its new discovery.

Silver(I) complexes of bis[2-(diphenylphosphino)phenyl] ether

The reaction of AgOTf in dichloromethane with bis(2-(diphenylphosphino)phenyl) ether (DPEphos) in an equimolar ratio afforded a dinuclear complex [Ag2(kappa2-P,P?-DPEphos)2(mu-OTf)2] (1), whereas the similar reaction in a 1:2 molar ratio resulted in the formation of a bis-chelating complex [Ag(kappa2-P,P?-DPEphos)2][OTf] (2). The silver(I) complex 1 was obtained as a dimer, in which two silver atoms are bridged by two triflate groups to form three adjacent eight-membered spirocyclic rings. The mixed-ligand complex [Ag(kappa2-P,P?-DPEphos)(2,2?-bpy)][OTf] (3) was obtained in the reaction of 1 in dichloromethane with 2,2?-bipyridine. The crystal structures of complexes 1-3 were determined by single crystal X-ray analyses.

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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