Tag: M.W:300-400

The three-dimensional configuration of the ester heterocycle is basically the same as that of the carbocycle. Compound: 1,2-Bis(diphenylphosphino)ethane(SMILESS: P(CCP(C1=CC=CC=C1)C2=CC=CC=C2)(C3=CC=CC=C3)C4=CC=CC=C4,cas:1663-45-2) is researched.Application In Synthesis of Bromoferrocene. The article 《Density Functional Theory Mechanistic Study of Ni-Catalyzed Reductive Alkyne-Alkyne Cyclodimerization: Oxidative Cyclization versus Outer-Sphere Proton Transfer》 in relation to this compound, is published in Organic Letters. Let’s take a look at the latest research on this compound (cas:1663-45-2).

D. functional theory mechanistic study of the nickel-catalyzed reductive alkyne-alkyne cyclodimerization with CH3OH/BEt3 unveils that, after forming a nickel-alkyne π complex, the reaction prefers outer-sphere proton transfer rather than the common alkyne-alkyne oxidative cyclization. The outperformance of aminophosphine ligand (L1) is attributed to its bidentate coordination that favors the proton transfer, the labile -NH2 and strong electron-donating -PPh2 arms and adequate Ni-P distance that allow the hydrogen transfer of the Et group of MeO-BEt3-.

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Reference:
Chiral nitrogen ligands in late transition metal-catalysed asymmetric synthesis—I. Addressing the problem of ligand lability in rhodium-catalysed hydrosilations,
Nitrogen-Containing Ligands for Asymmetric Homogeneous and Heterogeneous Catalysis

Heterocyclic compounds can be divided into two categories: alicyclic heterocycles and aromatic heterocycles. Compounds whose heterocycles in the molecular skeleton cannot reflect aromaticity are called alicyclic heterocyclic compounds. Compound: 1663-45-2, is researched, Molecular C26H24P2, about Designing and synthesis of phosphine derivatives of Ru3(CO)12 – Studies on catalytic isomerization of 1-alkenes, the main research direction is trinuclear ruthenium carbonyl ethanebisphosphino complex catalyst preparation crystal structure; isomerization catalyst trinuclear ruthenium carbonyl ethanebisphosphino complex.Category: chiral-nitrogen-ligands.

A comparative investigation on the isomerization reactions of 1-alkenes to their corresponding 2-alkenes catalyzed Ru3(CO)12 (1), Ru3(CO)9(PEt3)3 (2) and Ru3(CO)10(dppe) (3), (dppe = 1,2-bis(diphenylphosphino)ethane) is described. Both the complexes of types 2 and 3 were characterized by all anal. and spectroscopic data. The mol. structure of 2 was confirmed by single-crystal x-ray anal. The nature of phosphine ligands plays an important role in the isomerization of 1-alkenes. When the chelated diphosphine was used, the internal isomerization reaction by [Ru3(CO)10(dppe)] (3) is completed relatively in less time compared to other derivatives As per the DFT calculations, the observed reaction rate for the alkene isomerization may be explained based on the relative stability of 1, 2, and 3. The CO abstraction step is highly feasible in 3, the least stable among the three, thus the reaction occurs at the highest rate. Due to the increased relative stability from 2 to 1, the reaction requires more time at elevated temperatures and the rate decreases as a consequence.

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Reference:
Chiral nitrogen ligands in late transition metal-catalysed asymmetric synthesis—I. Addressing the problem of ligand lability in rhodium-catalysed hydrosilations,
Nitrogen-Containing Ligands for Asymmetric Homogeneous and Heterogeneous Catalysis

Application of 1663-45-2. 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. Compound: 1,2-Bis(diphenylphosphino)ethane, is researched, Molecular C26H24P2, CAS is 1663-45-2, about Highly Photoluminescent Blue Ionic Platinum-Based Emitters.

New cycloplatinated N-heterocyclic carbene (NHC) compounds with chelate diphosphines (P^P) as ancillary ligands: [Pt(R-C^C*)(P^P)]PF6 (R = H, P^P = dppm (1A), dppe (2A), dppbz (3A); R = CN, P^P = dppm (1B), dppe (2B), dppbz (3B)) have been prepared from the corresponding starting material [{Pt(R-C^C*)(μ-Cl)}2] (R = H, A, R = CN, B) and fully characterized. The new compound A has been prepared by a stepwise protocol. The photophys. properties of 1A-3A and 1B-3B have been widely studied and supported by the time-dependent-d. functional theory. These compounds show an efficient blue (dppe, dppbz) or cyan (dppm) emission in PMMA films (5 weight %), with photoluminescence quantum yield (PLQY) ranging from 30% to 87% under an argon atm. This emission has been assigned mainly to transitions from 3ILCT [π(NHC) → π*(NHC)] excited states with some 3LL’CT [π(NHC) → π*(P^P)] character. The electroluminescence of these materials in proof-of-concept solution-processed organic light-emitting diodes containing 3A and 3B as dopants was investigated. The CIE coordinates for devices based on 3A (0.22, 0.41) and 3B (0.24, 0.44) fit within the sky blue region. Highly photoluminescent ionic platinum-based emitters, [Pt(R-C^C*)(P^P)]PF6, were prepared They show an efficient blue or cyan emission in PMMA films (5 weight %), with PLQY ranging from 30% to 87%. Solution-processed organic light-emitting diodes based on 3A and 3B show CIE coordinates (0.22, 0.41 (3A); 0.24, 044 (3B)) fitting within the sky blue region.

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Reference:
Chiral nitrogen ligands in late transition metal-catalysed asymmetric synthesis—I. Addressing the problem of ligand lability in rhodium-catalysed hydrosilations,
Nitrogen-Containing Ligands for Asymmetric Homogeneous and Heterogeneous Catalysis

Bould, Jonathan; Tok, Oleg; Passarelli, Vincenzo; Londesborough, Michael G. S.; Macias, Ramon published an article about the compound: 1,2-Bis(diphenylphosphino)ethane( cas:1663-45-2,SMILESS:P(CCP(C1=CC=CC=C1)C2=CC=CC=C2)(C3=CC=CC=C3)C4=CC=CC=C4 ).Synthetic Route of C26H24P2. 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:1663-45-2) through the article.

The discovery of systems that interact with small mols. plays a vital facilitating role in the development of devices that show sensitivity to their surroundings and an ability to quickly relay chem. and phys. information. Herein, the authors report on the reaction of [NiCl2(dppe)] with decaborane that produces in usable yield a new 11-vertex nickelaborane, [7,7-(dppe)-nido-7-NiB10H12] (1), which shows interesting reactivity and functionality toward CO and ethylisonitrile. This contribution describes the synthesis and full structural characterization of 1 and its small-mol. EtNC and CO adducts, 2 and 3, and delineates the dynamic mol. behavior of all of these species in solution This information sets a foundation from which more advanced work on this and related metallaborane systems can be conceived and provides a more general reference to how NMR spectroscopy, combined with DFT calculations, can be used to analyze the precise locomotion of labile ligands around a metal center held within a borane cluster. The contra-rotation of the {L2M} moiety with respect to the face-bound borane fragment in [L2MB10H12] compounds, previously a curiosity chiefly restricted to NMR measurement, is now shown to control the elimination and uptake of ligands in [(L)(dppe)NiB10H12] (L = CO and EtNC).

In some applications, this compound(1663-45-2)Synthetic Route of C26H24P2 is unique.If you want to know more details about this compound, you can contact with the author or consult more relevant literature.

Reference:
Chiral nitrogen ligands in late transition metal-catalysed asymmetric synthesis—I. Addressing the problem of ligand lability in rhodium-catalysed hydrosilations,
Nitrogen-Containing Ligands for Asymmetric Homogeneous and Heterogeneous Catalysis

Safety of 1,2-Bis(diphenylphosphino)ethane. The fused heterocycle is formed by combining a benzene ring with a single heterocycle, or two or more single heterocycles. Compound: 1,2-Bis(diphenylphosphino)ethane, is researched, Molecular C26H24P2, CAS is 1663-45-2, about 31P NMR spectroscopic analysis on photooxidation of 1,n-bis(diphenylphosphino)alkanes with the aid of DFT calculations. Author is Yasui, Shinro; Yamazaki, Shoko.

The chloroform-d solution of diphosphine, 1,n-bis(diphenylphosphino)alkane (Ph2P(CH2)nPPh2; n = 1-6), was photolyzed with light from a xenon lamp in air. The progress of the reaction was followed by 31P NMR spectroscopy. The observed spectral change showed that the diphosphine is initially oxidized to diphosphine monoxide, Ph2P(=O)(CH2)nPPh2, which is further oxidized to diphosphine dioxide, Ph2P(=O)(CH2)nP(=O)Ph2. The oxidation of the diphosphine to the diphosphine monoxide took place according to first-order kinetics with respect to the concentration of the diphosphine, the first-order rate constant, kobs, being larger with increasing number of the methylene units in the spacer. The observation in kinetics is interpreted based on the conformation of the diphosphine radical cation intermediate initially generated by electron transfer from the photoexcited diphosphine to oxygen. D. functional theory (DFT) calculations predict that the diphosphine radical cation takes “”folded”” conformation where two phosphorus atoms are arranged closely to each other. The “”folded”” conformer of the diphosphine radical cation results from electrostatic interaction of these two phosphorus atoms. This conformer explains the observed dependency of kobs on the length of the spacer in the diphosphine.

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Reference:
Chiral nitrogen ligands in late transition metal-catalysed asymmetric synthesis—I. Addressing the problem of ligand lability in rhodium-catalysed hydrosilations,
Nitrogen-Containing Ligands for Asymmetric Homogeneous and Heterogeneous Catalysis

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.Li, Mengke; Cai, Xinyi; Chen, Zijian; Liu, Kunkun; Qiu, Weidong; Xie, Wentao; Wang, Liangying; Su, Shi-Jian researched the compound: 1,2-Bis(diphenylphosphino)ethane( cas:1663-45-2 ).Electric Literature of C26H24P2.They published the article 《Boosting purely organic room-temperature phosphorescence performance through a host-guest strategy》 about this compound( cas:1663-45-2 ) in Chemical Science. Keywords: heterocyclic isomer host guest cocrystal room temperature phosphorescence. We’ll tell you more about this compound (cas:1663-45-2).

The host-guest doping system has aroused great attention due to its promising advantage in stimulating bright and persistent room-temperature phosphorescence (RTP). Currently, exploration of the explicit structure-property relationship of bicomponent systems has encountered obstacles. In this work, two sets of heterocyclic isomers showing promising RTP emissions in the solid state were designed and synthesized. By encapsulating these phosphors into a robust phosphorus-containing host, several host-guest cocryst. systems were further developed, achieving highly efficient RTP performance with a phosphorescence quantum efficiency (ϕP) of ~26% and lifetime (τP) of ~32 ms. Detailed photophys. characterization and mol. dynamics (MD) simulation were conducted to reveal the structure-property relationships in such bicomponent systems. It was verified that other than restricting the mol. configuration, the host matrix could also dilute the guest to avoid concentration quenching and provide an external heavy atom effect for the population of triplet excitons, thus boosting the RTP performance of the guest.

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Reference:
Chiral nitrogen ligands in late transition metal-catalysed asymmetric synthesis—I. Addressing the problem of ligand lability in rhodium-catalysed hydrosilations,
Nitrogen-Containing Ligands for Asymmetric Homogeneous and Heterogeneous Catalysis

Electric Literature of C26H24P2. The fused heterocycle is formed by combining a benzene ring with a single heterocycle, or two or more single heterocycles. Compound: 1,2-Bis(diphenylphosphino)ethane, is researched, Molecular C26H24P2, CAS is 1663-45-2, about Preparation of Neutral trans – cis [Ru(O2CR)2P2(NN)], Cationic [Ru(O2CR)P2(NN)](O2CR) and Pincer [Ru(O2CR)(CNN)P2] (P = PPh3, P2 = diphosphine) Carboxylate Complexes and their Application in the Catalytic Carbonyl Compounds Reduction. Author is Baldino, Salvatore; Giboulot, Steven; Lovison, Denise; Nedden, Hans Gunter; Pothig, Alexander; Zanotti-Gerosa, Antonio; Zuccaccia, Daniele; Ballico, Maurizio; Baratta, Walter.

The diacetate complexes trans-[Ru(κ1-OAc)2(PPh3)2(NN)] [1, NN = ethylenediamine (en), 2, 2-(aminomethyl)pyridine (ampy), 3, 2-(aminomethyl)pyrimidine (ampyrim)] have been isolated in 76-88% yield by reaction of [Ru(κ2-OAc)2(PPh3)2] with the corresponding nitrogen ligands. The ampy-type derivatives 2 and 3 undergo isomerization to the thermodynamically most stable cationic complexes [Ru(κ1-OAc)(PPh3)2(NN)]OAc (2a, 3a) and cis-[Ru(κ1-OAc)2(PPh3)2(NN)] (2b, 3b) in methanol at RT. The trans-[Ru(κ1-OAc)2(P2)2] (4, P2 = dppm, 5, dppe) compounds have been synthesized from [Ru(κ2-OAc)2(PPh3)2] by reaction with the suitable diphosphine in toluene at 95°. The complex cis-[Ru(κ1-OAc)2(dppm)(ampy)] (6) has been obtained from [Ru(κ2-OAc)2(PPh3)2] and dppm in toluene at reflux and reaction with ampy. The derivatives trans-[Ru(κ1-OAc)2P2(NN)] (7-16; NN = en, ampy, ampyrim, 8-aminoquinoline; P2 = dppp, dppb, dppf, (R)-BINAP) can be easily synthesized from [Ru(κ2-OAc)2(PPh3)2] with a diphosphine and treatment with the NN ligands at RT. Alternatively these compounds have been prepared from trans-[Ru(OAc)2(PPh3)2(NN)] by reaction with the diphosphine in MEK at 50°. The use of (R)-BINAP affords trans-[Ru(κ1-OAc)2((R)-BINAP)(NN)] (11, NN = ampy, 15, ampyrim) isolated as single stereoisomers. Treatment of the ampy-type complexes 8-15 with methanol at RT leads to isomerization to the cationic derivatives [Ru(κ2-OAc)P2(NN)]OAc (8a-15a; NN = ampy, ampyrim; P2 = dppp, dppb, dppf, (R)-BINAP). Similarly to 2, the dipivalate trans-[Ru(κ1-OPiv)2(PPh3)2(ampy)] (18) is prepared from [Ru(κ2-OPiv)2(PPh3)2] (17) and ampy in CHCl3. The pincer acetate [Ru(κ1-OAc)(CNNOMe)(PPh3)2] (19) has been synthesized from [Ru(κ2-OAc)2(PPh3)2] and HCNNOMe ligand in 2-propanol with NEt3 at reflux. In addition, the dppb pincer complexes [Ru(κ1-OAc)(CNN)(dppb)] (20, CNN = AMTP, 21, AMBQPh) have been obtained from [Ru(κ2-OAc)2(PPh3)2], dppb, and HAMTP or HAMBQPh with NEt3, resp. The acetate NN and pincer complexes are active in transfer hydrogenation with 2-propanol and hydrogenation with H2 of carbonyl compounds at S/C values of up to 10000 and with TOF values of up to 160000 h-1.

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Reference:
Chiral nitrogen ligands in late transition metal-catalysed asymmetric synthesis—I. Addressing the problem of ligand lability in rhodium-catalysed hydrosilations,
Nitrogen-Containing Ligands for Asymmetric Homogeneous and Heterogeneous Catalysis

Application In Synthesis of 1,2-Bis(diphenylphosphino)ethane. 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. Compound: 1,2-Bis(diphenylphosphino)ethane, is researched, Molecular C26H24P2, CAS is 1663-45-2, about Nano cadmium(II)-benzyl benzothiazol-2-ylcarbamodithioate complexes: Synthesis, characterization, anti-cancer and antibacterial studies.

Benzyl benzothiazol-2-ylcarbamodithioate (BBCT) was used as a ligand for the synthesis of [Cd(BBCT)(PPh3)Cl]Cl (1), [Cd2(BBCT)2(μ-dppm)2]Cl4 (2), or [Cd(BBCT)(phosphine)]Cl2 (where phosphine is dppe (3), dppp (4), dppb (5)) and [Cd(BBCT)(amine)]Cl2 (where amine is bipy (6) or phen (7)). The characterizations (molar conductivity, elemental anal., IR spectra and 31P NMR, 1H NMR and 13C NMR spectra) prove that BBCT ligand behaves as a bidentate ligand through the N atom of thiazole ring group and S atom of thion group while the phosphines or amines ligands behave as bidentate ligand through the P atoms or N atoms, resp. Furthermore, the nanostructure of (1) and (7) was examined by SEM and the results demonstrate the presence of regular nanostructures. The complex (1) shows fiber-grip-like geometry with 85-110 nm while complex (7) shows spiny-flowers-like nanostructures with the flower-forming spines within the range of 80-190 nm. The antibacterial activity of the complexes (1, 2, 3, 6, 7) against S.Epidermidis, S. aureus (gram-pos.) and C.Freundii (gram-neg.) was examined using amikacin as a pos. control. However, all the complexes showed a high ability to inhibit the bacterial species studied, and the inhibition zone was better than that obtained with amikacin. Moreover, the anti-cancer activity of the complexes (1) and (7) against ovarian cancer cell was studied and the results show that both complexes gave cell viability values less than 6%.

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Reference:
Chiral nitrogen ligands in late transition metal-catalysed asymmetric synthesis—I. Addressing the problem of ligand lability in rhodium-catalysed hydrosilations,
Nitrogen-Containing Ligands for Asymmetric Homogeneous and Heterogeneous Catalysis

Synthetic Route of C26H24P2. The protonation of heteroatoms in aromatic heterocycles can be divided into two categories: lone pairs of electrons are in the aromatic ring conjugated system; and lone pairs of electrons do not participate. Compound: 1,2-Bis(diphenylphosphino)ethane, is researched, Molecular C26H24P2, CAS is 1663-45-2, about The Trityl-Cation Mediated Phosphine Oxides Reduction. Author is Laye, Claire; Lusseau, Jonathan; Robert, Frederic; Landais, Yannick.

Reduction of phosphine oxides into the corresponding phosphines using PhSiH3 as a reducing agent and Ph3C+[B(C6F5)4]- as an initiator is described. The process is highly efficient, reducing a broad range of secondary and tertiary alkyl and arylphosphines, bearing various functional groups in generally good yields. The reaction is believed to proceed through the generation of a silyl cation, which reaction with the phosphine oxide provides a phosphonium salt, further reduced by the silane to afford the desired phosphine along with siloxanes.

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Reference:
Chiral nitrogen ligands in late transition metal-catalysed asymmetric synthesis—I. Addressing the problem of ligand lability in rhodium-catalysed hydrosilations,
Nitrogen-Containing Ligands for Asymmetric Homogeneous and Heterogeneous Catalysis

Choi, Byeong-Min; Son, Seok-Hwan; Lee, Chul-Wee; Park, Sun-Yeong; Chung, Min-Chul published the article 《Characterization and synthesis of molybdenum metal precursors for hydrocracking reaction of vacuum residues》. Keywords: molybdenum metal hydrocracking reaction.They researched the compound: 1,2-Bis(diphenylphosphino)ethane( cas:1663-45-2 ).HPLC of Formula: 1663-45-2. 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:1663-45-2) here.

In this study, Molybdenum precursors were synthesized with Triphenylphosphine, 1,2-Bis(diphenylphosphino)ethane, Pyridine, 2,2-Bipyricine as a ligands. The molybdenum precursors was used for Hydrocraking reaction of Vacuum Residue (VR). Hydrocracking reactions were carried out under the 430 °C and H2 pressure of 80 bar in an 100 mL high pressure reactor. New Molybdenum precursors were tested and their activities were compared with Mo-octoate. The Molybdeum-Phosphine precursor showed the best performances, high yield and low coke contents (below 0,5 wt%), in of hydrocracking for VR. To characterize the physicochem. properties of Moprecursor catalyst, various characterization techniques (NMR, XPS) were carried out. We confirmed that cokes in the reactor were contained the P atoms derived from ligand of Mo-precursor after hydrocracking of VR.

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Reference:
Chiral nitrogen ligands in late transition metal-catalysed asymmetric synthesis—I. Addressing the problem of ligand lability in rhodium-catalysed hydrosilations,
Nitrogen-Containing Ligands for Asymmetric Homogeneous and Heterogeneous Catalysis