Tag: M.W:500-600

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)

The complex [Cu(xantphos)(dmp)][PF6] (dmp = 2,9-dimethyl-1,10-phenanthroline) in a nanostructured metal oxyde matrix shows better sensitivity to oxygen (KSV = 9.74 ± 0.87 kPa-1 between 0 and 1 kPa pO2 and 5.59 ± 0.15 kPa-1 between 0 and 10 kPa pO2) than cyclometallated iridium complexes in the same conditions.

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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. 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, HPLC of Formula: C39H32OP2

A mild and effective method is described for 11C-labeling of peptides selectively at the N-terminal nitrogen or at internal lysine positions. The presented method relies on the use of specific biphosphine palladium?methyl complexes and their high reactivity towards amino-carbonylation of amine groups in the presence [11C]carbon monoxide. The protocol facilitates the production of native N-11C-acetylated peptides, without any structural modifications and has been applied to a selection of bioactive peptides.

Sometimes chemists are able to propose two or more mechanisms that are consistent with the available data.HPLC of Formula: C39H32OP2, If a proposed mechanism predicts the wrong experimental rate law, however, the mechanism must be incorrect.Welcome to check out more blogs about 161265-03-8, 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

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, Recommanded Product: 161265-03-8

Alkoxycarbonylation of ethylene with carbon monoxide and cellulose in 1-n-butyl-3-methylimidazolium methanesulfonate affords cellulose propionate with a degree of substitution of 1-2.

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.Recommanded Product: 161265-03-8, 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

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., Formula: C36H28OP2

Light-emitting devices, using a high-phosphorescent copper(I) complex [Cu(phen)(POP)]PF6 [POP = Bis-[(2-diphenyl-phosphino)phenyl]ether and phen = 1,10-phenanthroline] as dopant and emitting center have been investigated, in different device architectures involving single layer devices using the blend of poly(N-vinylcarbazole) (PVK) and 2-tert-butylphenyl-5-biphenyl-1,3,4-oxadiazol (PBD) as host and heterostructure multi layer devices using PVK as host. The maximum luminance of the phosphorescent devices reached 1400 cd/m2 and the highest luminance efficiency exceeded 1 cd/A for single layer devices and higher luminescence efficiency up to 1.8 cd/A for multi layer ones. Efficient electrophosphorescent OLEDs can be developed by using low-cost Cu(I) complex as guest and polymer as host material.

Interested yet? Keep reading other articles of 166330-10-5!, Formula: C36H28OP2

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. 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, COA of Formula: C39H32OP2

The incorporation of CO2 into organometallic and organic molecules represents a sustainable way to prepare carboxylates. The mechanism of reductive carboxylation of alkyl halides has been proposed to proceed through the reduction of NiII to NiI by either Zn or Mn, followed by CO2 insertion into NiI-alkyl species. No experimental evidence has been previously established to support the two proposed steps. Demonstrated herein is that the direct reduction of (tBu-Xantphos)NiIIBr2 by Zn affords NiI species. (tBu-Xantphos)NiI-Me and (tBu-Xantphos)NiI-Et complexes undergo fast insertion of CO2 at 22 C. The substantially faster rate, relative to that of NiII complexes, serves as the long-sought-after experimental support for the proposed mechanisms of Ni-catalyzed carboxylation reactions.

Balanced chemical reaction does not necessarily reveal either the individual elementary reactions by which a reaction occurs or its rate law.COA of 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

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. 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, Safety of (9,9-Dimethyl-9H-xanthene-4,5-diyl)bis(diphenylphosphine)

Tuning the reactivity of arylpalladium intermediates enables control of catalytic arylative 5-exo and 6-endo cyclizations of alkynols. The two modes of cyclizations represent a rare example of controllable, regioselective difunctionalization of alkynes. The cyclizations are useful in offering a divergent synthesis of oxygen-containing heterocycles, which is of synthetic use for further derivatization. Formal synthesis of an hNK-1 receptor antagonist also showcases the utility of our arylative cyclization.

Balanced chemical reaction does not necessarily reveal either the individual elementary reactions by which a reaction occurs or its rate law.Safety of (9,9-Dimethyl-9H-xanthene-4,5-diyl)bis(diphenylphosphine). 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

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. 12150-46-8, Name is 1,1-Bis(diphenylphosphino)ferrocene, molecular formula is C34H28FeP2. In a Article，once mentioned of 12150-46-8, category: chiral-phosphine-ligands

[n]Cycloparaphenylenes (n = 8-13, CPPs) were synthesized, and their physical properties were systematically investigated. [8] and [12]CPPs were selectively prepared from the reaction of 4,4?-bis(trimethylstannyl) biphenyl and 4,4?-bis(trimethylstannyl)terphenyl, respectively, with Pt(cod)Cl2 (cod = 1,5-cyclooctadiene) through square-shaped tetranuclear platinum intermediates. A mixture of [8]-[13]CPPs was prepared in good combined yields by mixing biphenyl and terphenyl precursors with platinum sources. Products were easily separated and purified by using gel permeation chromatography. In 1H NMR spectra, the proton of the CPPs shifts to a lower field as n increased due to an anisotropic effect from the nearby PP moieties. Although the UV-vis spectra were rather insensitive to the size of the CPPs, the fluorescence spectra changed significantly in relation to their size. A larger Stokes shift was observed for the smaller CPPs. Redox properties of the CPPs were measured for the first time by using cyclic voltammetry, and the smaller CPPs had lower oxidation potentials. The results are consistent with the HOMO energies of CPPs, of which the smaller CPPs had higher energies.

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

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. 166330-10-5, Name is (Oxybis(2,1-phenylene))bis(diphenylphosphine), molecular formula is C36H28OP2. In a Patent，once mentioned of 166330-10-5, Formula: C36H28OP2

A process for producing oxygenated products from a Fischer-Tropsch derived olefinic feedstock, includes reacting the feedstock, in a hydroformylation reaction stage, with carbon monoxide and hydrogen at an elevated reaction temperature and at a superatmospheric reaction pressure in the presence of a hydroformylation catalyst system. The catalyst system comprises a mixture, combination or complex of a transition metal, T, where T is selected from the transition metals of Group VIII of the Periodic Table of Elements; carbon monoxide, CO; hydrogen, H2; as a primary ligand, a monodentate phosphorus ligand; and as a secondary ligand, a bidentate phosphorus ligand which confers resistance on the catalyst system to poisoning arising from the presence of undesired components in the Fischer-Tropsch derived feedstock.

Balanced chemical reaction does not necessarily reveal either the individual elementary reactions by which a reaction occurs or its rate law.Formula: C36H28OP2. In my other articles, you can also check out more blogs about 166330-10-5

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

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

Treatment of Ru(PPh3)3HCl with the pincer phosphines 9,9-dimethyl-4,5-bis(diphenylphosphino)xanthene (xantphos), bis(2- diphenylphosphinophenyl)ether (DPEphos), or (Ph2PCH 2CH2)2O affords Ru(P-O-P)(PPh3)HCl (xantphos, 1a; DPEphos, 1b; (Ph2PCH2CH2) 2O, 1c). The X-ray crystal structures of 1a-c show that all three P-O-P ligands coordinate in a tridentate manner through phosphorus and oxygen. Abstraction of the chloride ligand from 1a-c by NaBAr4F (BAr4F = B(3,5-C6H3(CF 3)2)4) gives the cationic aqua complexes [Ru(P-O-P)(PPh3)(H2O)H]BAr4F (3a-c). Removal of chloride from 1a by AgOTf yields Ru(xantphos)(PPh3)H(OTf) (2a), which reacts with water to form [Ru(xantphos)(PPh3)(H 2O)H](OTf). The aqua complexes 3a-b react with O2 to generate [Ru(xantphos)(PPh3)(eta2-O2)H] BAr4F (5a) and [Ru(DPEphos)(PPh3) (eta2-O2)H]BAr4F (5b). Addition of H2 or N2 to 3a-c yields the thermally unstable dihydrogen and dinitrogen species [Ru(P-O-P)(PPh3)(eta2-H 2)H]BAr4F (6a-c) and [Ru(P-O-P)(PPh 3)(N2)H]BAr4F (7a-c), which have been characterized by multinuclear NMR spectroscopy at low temperature. Ru(PPh3)3HCl reacts with 1,1?-bis(diphenylphosphino) ferrocene (dppf) to give the 16-electron complex Ru(dppf)(PPh3)HCl (1d), which upon treatment with NaBAr4F, affords [Ru(dppf){(eta6-C6H5)PPh2}H] BAr4F (8), in which the PPh3 ligand binds eta6 through one of the PPh3 phenyl rings. Reaction of 8 with CO or PMe3 at elevated temperatures yields the 18-electron products [Ru(dppf)(PPh3)(CO)2H]BArF4 (9) and [Ru(PMe3)5H]BAr4F (10).

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.Safety of 1,1-Bis(diphenylphosphino)ferrocene, you can also check out more blogs about12150-46-8

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

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. 161265-03-8, Name is (9,9-Dimethyl-9H-xanthene-4,5-diyl)bis(diphenylphosphine), molecular formula is C39H32OP2. In a Patent，once mentioned of 161265-03-8, Formula: C39H32OP2

The invention relates to a kind of the formula shown in (III) trifluoromethyl substituted sulfoxide compound synthesis method, the method comprises: in a nitrogen atmosphere and in organic solvent, a catalyst, a ligand phosphine and the presence of an auxiliary agent, the following formula (I) compounds and the following formula (II) compound generating reaction, after-treatment after reaction, so as to obtain the compound of said formula (III), wherein R 1 selected from H, C 1-C 6 alkyl, C 1-C 6 alkoxy, halogen or nitro; R 2 selected from C 1-C 6 alkyl, with a substituent or not substituted phenyl, the substituent is C 1-C 6 alkyl or halogen. The method is made of the catalyst, a ligand phosphine and unique compounding chemicals and organic solvent reaction system, thereby realizing the sulfoxide compound direct three fluoromethylation reaction, to obtain the target product can be a high yield, has a broad market prospect. (by machine translation)

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