Category: 14694-95-2

The preparation of ester heterocycles mostly uses heteroatoms as nucleophilic sites, which are achieved by intramolecular substitution or addition reactions. Compound: Tris(triphenylphosphine)chlororhodium( cas:14694-95-2 ) is researched.Electric Literature of C54H45ClP3Rh.Zhang, Yu; Woods, Toby J.; Rauchfuss, Thomas B. published the article 《Application of Hemilabile Ligands to “”At-Metal Switching”” Hydrogenation Catalysis》 about this compound( cas:14694-95-2 ) in Organometallics. Keywords: Rh and Ir diphenylphosphinoanisole complexes; crystal structure rhodium iridium phenylphosphinoanisole hydride chloride complex; mol structure rhodium iridium phenylphosphinoanisole hydride chloride complex. Let’s learn more about this compound (cas:14694-95-2).

The paper describes the development of switchable catalysts, i.e. precatalysts that are activated by a reagent and the resulting active catalyst could be shut off with a 2nd reagent. A concept is introduced, involving oxidative addition of Rh(I) catalyst with trityl chloride and reductive activation of dichlororhodium(III) phosphines with cobaltocene. Part 1 of the paper describes the development of the catalytic platforms, which are 2-diphenylphosphinoanisole (PPh2An) complexes of Rh and Ir. Part 2 describes the proof-of-concept as applied to the hydrogenation of styrene, including mechanistic studies. The Rh catalysts were developed from Rh2Cl2(C2H4)4, which was converted to Rh2Cl2(C2H4)2(κ1-PPh2An)2 and RhCl(κ1-PPh2An)(κ2-PPh2An). This charge-neutral chloride is a precursor to [Rh(κ2-PPh2An)2]BArF4 and the precatalyst [RhCl2(κ2-PPh2An)2]BArF4. The Ir catalysts were developed from Ir2Cl2(coe)4, which reacts with PPh2An to give IrClH(κ2-PPh2C6H4OCH2)(κ2-PPh2An). This cyclometalated complex behaves equivalently to IrCl(PPh2An)2. IrClH(κ2-PPh2C6H4OCH2)(κ2-PPh2An) readily react with H2 to form IrClH2(κ1-PPh2An)(κ2-PPh2An), which is a viable precursor to the off state catalyst [IrCl2(κ2-PPh2An)2]BArF4. In part 2, the authors demonstrated that [MCl2(κ2-PPh2An)2]BArF4 (M = Rh, Ir) are inactive for styrene hydrogenation in contrast with the other M-PAn compounds Especially in the case of Rh, the hydrogenation is well controlled with the addition of selected reagents. Details of OA/RA are elucidated using cyclic voltammetry and stochiometric chem. redox experiments

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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

Qin, Shuanglin; Liu, Tongtong; Luo, Yunhao; Jiang, Shende; Yang, Guang published the article 《Diastereoselective Rh-catalyzed decarboxylative allylation to form quaternary stereocenters using sulfinimine as the directing group》. Keywords: chiral sulfinimine decarboxylative allylation diastereoselective rhodium catalyst.They researched the compound: Tris(triphenylphosphine)chlororhodium( cas:14694-95-2 ).Quality Control of Tris(triphenylphosphine)chlororhodium. Aromatic heterocyclic compounds can be divided into two categories: single heterocyclic and fused heterocyclic. In addition, there is a lot of other information about this compound (cas:14694-95-2) here.

In this paper, for the first time that the diastereoselective Rh-catalyzed decarboxylative allylation of chiral sulfinimines used to form quaternary stereocenters. The key factor in giving rise to the successful development of this method was the application of the com. available and achiral Wilkinson’s Rh catalyst. Explained by a plausible mechanism, the sulfinimine group might be a potent directing group chelated with Rh to construct intramol. steric hindrance. In addition, broad functional group tolerance was observed, and subsequently revealed the various transformations verifying the utility of this method for rapidly accessing complex enantio-enriched polycyclic compounds

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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 chemical properties of alicyclic heterocycles are similar to those of the corresponding chain compounds. Compound: Tris(triphenylphosphine)chlororhodium, is researched, Molecular C54H45ClP3Rh, CAS is 14694-95-2, about Mechanistic Insights into the Rh(I)/Rh2(II)-Catalyzed Divergent Ring-Opening of Cyclopropenes: A Computational Study, the main research direction is cyclopropene rhodium ring opening mechanism cycloisomerization PES.Application In Synthesis of Tris(triphenylphosphine)chlororhodium.

The mechanisms of transition-metal-catalyzed cyclopropenes involved reactions are complicated since diversified active intermediates could be potentially formed. Herein, computational studies were performed to gain mechanistic insights into the Rh(I)- and Rh2(II)-catalyzed regioselective ring-opening of allylic cyclopropenecarboxylate (1) and further rearrangement to form Δβ,γ butenolides. For the Rh(I)-catalyzed ring-opening of cyclopropene moiety of 1, an unusual oxidative addition of C-C σ bond of the three-membered ring onto Rh(I) to form the intermediate with a C-Rh σ bond and a π…Rh interaction is proposed. While, for the Rh2(II)-catalyzed reaction, it is more feasible for the cyclopropene moiety of 1 to convert to the Rh2(II) vinyl carbene intermediate. Despite the formation of different key intermediates for the Rh(I) and Rh2(II)-catalyzed ring-opening reactions, the subsequent intramol. nucleophilic cyclization to form furan derivatives is similar. In addition, the origins of different regioselectivities for the Rh(I) and Rh2(II)-catalyzed reactions are revealed.

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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

Safety of Tris(triphenylphosphine)chlororhodium. The reaction of aromatic heterocyclic molecules with protons is called protonation. Aromatic heterocycles are more basic than benzene due to the participation of heteroatoms. Compound: Tris(triphenylphosphine)chlororhodium, is researched, Molecular C54H45ClP3Rh, CAS is 14694-95-2, about Isomerising hydrosilylation of oleic acid esters with industrially important triethoxysilanes. Author is Herzog, Rainer F.; Huber, Thimo; Riepl, Herbert M..

It is a desirable reaction to shift the double bond of the naturally abundant oleic acid from plant oils to the terminal position to enable suitable hydrosilylation or other hydrometallations to obtain intermediates of polymer manufacture The catalyst [Ir(OMe)(1,5-cod)]2 is able to catalyze the 8-fold isomerization using simple alkyl silanes as reactant, but tech. more interesting alkoxysilanes do not react. It was found that combined application of HCo(N2)(PPh3)3 and Wilkinson’s catalyst isomerize and hydrosilylate oleic acid to the desired ω-triethoxysilyloctadecanoic acid ethylester but with still poor yield. Considerable improvement was found when the phosphines are changed, i.e. tris-p-tolylphosphine being the most effective yielding nearly 50% terminally hydrosilylated oleic acid ester.

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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

Kim, Kwang Ho; Choi, Joon Weon; Kim, Chang Soo; Jeong, Keunhong published an article about the compound: Tris(triphenylphosphine)chlororhodium( cas:14694-95-2,SMILESS:[Rh]Cl.P(C1=CC=CC=C1)(C2=CC=CC=C2)C3=CC=CC=C3.P(C4=CC=CC=C4)(C5=CC=CC=C5)C6=CC=CC=C6.P(C7=CC=CC=C7)(C8=CC=CC=C8)C9=CC=CC=C9 ).Application of 14694-95-2. Aromatic heterocyclic compounds can be classified according to the number of heteroatoms or the size of the ring. The authors also want to convey more information about this compound (cas:14694-95-2) through the article.

We herein report our new hydrogenation strategy realized at room temperature and atm. pressure for stabilizing lignin model phenols in the presence of Wilkinson’s catalyst (RhCl(PPh3)3). To the best of our knowledge, we first employed a parahydrogen for the hydrogenation study of lignin-derived reactive phenols with vinyl- and allyl groups, and parahydrogen-induced polarization was observed in-situ using a benchtop NMR spectroscopic system. The results clearly showed the saturation of those reactive functional groups with Wilkinson’s catalyst as well as enhanced spin polarizations, which will be a firm basis for developing new types of hydrogenation catalysts in mild conditions. The benchtop NMR system integrated with the use of parahydrogen and homogeneous hydrogenation processes employed in this study could provide insights toward new fundamental applications. Furthermore, this strategy shows potential for developing a new practical anal. tool with highly polarized nuclear spins in the lignin-based biorefineries.

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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

Hils, Christian; Schmelz, Joachim; Drechsler, Markus; Schmalz, Holger published an article about the compound: Tris(triphenylphosphine)chlororhodium( cas:14694-95-2,SMILESS:[Rh]Cl.P(C1=CC=CC=C1)(C2=CC=CC=C2)C3=CC=CC=C3.P(C4=CC=CC=C4)(C5=CC=CC=C5)C6=CC=CC=C6.P(C7=CC=CC=C7)(C8=CC=CC=C8)C9=CC=CC=C9 ).Name: Tris(triphenylphosphine)chlororhodium. Aromatic heterocyclic compounds can be classified according to the number of heteroatoms or the size of the ring. The authors also want to convey more information about this compound (cas:14694-95-2) through the article.

Surface-compartmentalized micellar nanostructures (Janus and patchy micelles) have gained increasing interest due to their unique properties opening highly relevant applications, e.g., as efficient particulate surfactants, compatibilizers in polymer blends, or templates for catalytically active nanoparticles. We present a facile method for the production of worm-like Janus micelles based on crystallization-driven self-assembly of a double-crystalline triblock terpolymer with a crystallizable polyethylene middle block and two highly incompatible corona blocks, polystyrene and poly(ethylene oxide). This approach enables the production of amphiphilic Janus micelles with excellent interfacial activity by a comparably simple heating and cooling protocol directly in solution

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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

So far, in addition to halogen atoms, other non-metallic atoms can become part of the aromatic heterocycle, and the target ring system is still aromatic.Bartlewicz, Olga; Zielinski, Michal; Kaczmarek, Marta; Maciejewski, Hieronim researched the compound: Tris(triphenylphosphine)chlororhodium( cas:14694-95-2 ).Safety of Tris(triphenylphosphine)chlororhodium.They published the article 《Synthesis, characterization and catalytic activity of new SILPs based on MgO-SiO2 and MgO-SiO2/lignin supports》 about this compound( cas:14694-95-2 ) in Molecular Catalysis. Keywords: magnesium oxide silica ionic liquid hydrosilylation catalyst. We’ll tell you more about this compound (cas:14694-95-2).

New Supported Ionic Liquid Phase (SILP) materials on magnesium oxide-silica (MgO-SiO2) and magnesium oxide-silica/lignin (MgO-SiO2/lignin) supports were obtained. The new SILP materials contain imidazolium, pyridinium, phosphonium and sulfonium cations and methylsulfate as well as bis(trifluoromethylsulfonyl)imide anions. The obtained systems were subjected to detailed physicochem. characterization by: XRD, SEM-EDX, elemental anal., thermogravimetric measurements, IR spectroscopy and particle size determination The adsorption properties of both, the supports and the obtained SILP materials, were addnl. determined The catalytic activity and possibility of reusing the obtained SILP systems were confirmed in the hydrosilylation reaction of 1-octene with 1,1,1,3,5,5,5-heptamethyltrisiloxane.

There is still a lot of research devoted to this compound(SMILES：[Rh]Cl.P(C1=CC=CC=C1)(C2=CC=CC=C2)C3=CC=CC=C3.P(C4=CC=CC=C4)(C5=CC=CC=C5)C6=CC=CC=C6.P(C7=CC=CC=C7)(C8=CC=CC=C8)C9=CC=CC=C9)Safety of Tris(triphenylphosphine)chlororhodium, and with the development of science, more effects of this compound(14694-95-2) can be discovered.

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

Most of the natural products isolated at present are heterocyclic compounds, so heterocyclic compounds occupy an important position in the research of organic chemistry. A compound: 14694-95-2, is researched, SMILESS is [Rh]Cl.P(C1=CC=CC=C1)(C2=CC=CC=C2)C3=CC=CC=C3.P(C4=CC=CC=C4)(C5=CC=CC=C5)C6=CC=CC=C6.P(C7=CC=CC=C7)(C8=CC=CC=C8)C9=CC=CC=C9, Molecular C54H45ClP3RhJournal, Polyhedron called Synthesis of a rhodium(III) triphenylphosphine complex via C-S bond cleavage of an azo-thioether ligand: X-ray structure, electrochemistry and catalysis towards transfer hydrogenation of ketones, Author is Roy, Puspendu; Manna, Chandan Kumar; Naskar, Rahul; Mondal, Tapan Kumar, the main research direction is rhodium triphenylphosphine thiophenylazenyl complex preparation crystal mol structure electrochem; catalysis transfer hydrogenation ketone rhodium triphenylphosphine thiophenylazenyl complex.Name: Tris(triphenylphosphine)chlororhodium.

A new rhodium(III) triphenylphosphine complex having the general formula [Rh(PPh3)2(L)Cl] (1) was synthesized by C-S bond cleavage of an ONS donor azo-thioether ligand (L-CH2Ph). The complex was thoroughly characterized by various spectroscopic techniques. Its single crystal x-ray structure exhibits an octahedral geometry around the rhodium(III) center. A cyclic voltammogram of the complex exhibits ligand based quasi-irreversible oxidative and reductive responses. The electronic structure, redox properties and electronic excitations in the complex were interpreted by DFT and TDDFT calculations The complex effectively catalyzed the transfer hydrogenation reaction of ketones with high yields in i-PrOH in the presence of a base.

There is still a lot of research devoted to this compound(SMILES：[Rh]Cl.P(C1=CC=CC=C1)(C2=CC=CC=C2)C3=CC=CC=C3.P(C4=CC=CC=C4)(C5=CC=CC=C5)C6=CC=CC=C6.P(C7=CC=CC=C7)(C8=CC=CC=C8)C9=CC=CC=C9)Name: Tris(triphenylphosphine)chlororhodium, and with the development of science, more effects of this compound(14694-95-2) can be discovered.

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

COA of Formula: C54H45ClP3Rh. The fused heterocycle is formed by combining a benzene ring with a single heterocycle, or two or more single heterocycles. Compound: Tris(triphenylphosphine)chlororhodium, is researched, Molecular C54H45ClP3Rh, CAS is 14694-95-2, about Polyethylene Containing Triblock Copolymers Synthesized by Post-polymerization Functionalization. Author is Yan, Tianwei; Guironnet, Damien.

We report the synthesis of amphiphilic triblock copolymers containing a polyethylene block as the center block. The synthetic methodol. consists of performing four consecutive post-polymerization reactions on polyethylene to yield a dihydroxyl-terminated polymer. First, a cross-metathesis reaction converts the olefinic end-group of the polyethylene into an α,β-unsaturated ester followed by isomerization of the double bond and then its hydroformylation. This sequence introduces an aldehyde group randomly distributed along the polymer backbone. Finally, the reduction of the aldehyde- and ester-functionalized polymer yields two terminal hydroxyl groups. The methodol. was first established using low-mol.-weight model substrates before being performed on a polyethylene with a mol. weight of Mn = 13 kg mol-1. The functionalized polyethylene was used to initiate the ring-opening polymerizations of ε-caprolactone and tert-Bu glycidyl ether to yield the corresponding triblock copolymers. Subsequent hydrolysis of the tert-Bu groups in the polyether yielded an amphiphilic polymer that formed micelles in water.

There is still a lot of research devoted to this compound(SMILES：[Rh]Cl.P(C1=CC=CC=C1)(C2=CC=CC=C2)C3=CC=CC=C3.P(C4=CC=CC=C4)(C5=CC=CC=C5)C6=CC=CC=C6.P(C7=CC=CC=C7)(C8=CC=CC=C8)C9=CC=CC=C9)COA of Formula: C54H45ClP3Rh, and with the development of science, more effects of this compound(14694-95-2) can be discovered.

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

Epoxy compounds usually have stronger nucleophilic ability, because the alkyl group on the oxygen atom makes the bond angle smaller, which makes the lone pair of electrons react more dissimilarly with the electron-deficient system. Compound: Tris(triphenylphosphine)chlororhodium, is researched, Molecular C54H45ClP3Rh, CAS is 14694-95-2, about Rh-Catalyzed Hydrogenation of CO2 to Formic Acid in DMSO-based Reaction Media: Solved and Unsolved Challenges for Process Development.Safety of Tris(triphenylphosphine)chlororhodium.

Process concepts have been conceived and evaluated for the amine-free homogeneous catalyzed hydrogenation of CO2 to formic acid (FA). Base-free DMSO-mediated production of FA has been shown to avoid the formation of stable intermediates and presumably the energy-intensive FA recovery strategies. Here, we address the challenges in the development of an overall process: from catalyst immobilization to the FA isolation. The immobilization of the homogeneous catalyst was achieved using a multiphasic approach (n-heptane/DMSO) ensuring high retention of the catalyst (>99%) and allowing facile separation of the catalyst-free product phase. We show that the strong mol. interactions between DMSO and FA on the one hand shift the equilibrium towards the product side, on the other hand, lead to the formation of an azeotrope preventing a simple isolation step by distillation Thus, we devised an isolation strategy based on the use of co-solvents and computed the energy demands. Acetic acid was identified as best co-solvent and its compatibility with the catalyst system was exptl. verified. Overall, the outlined process involving DMSO and acetic acid as co-solvent has a computed energy demand on a par with state-of-the art amine-based processes. However, the insufficient chem. stability of DMSO poses major limitations on processes based on this solvent.

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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