Tag: M.W:300-400

HPLC of Formula: 1663-45-2. 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: 1,2-Bis(diphenylphosphino)ethane, is researched, Molecular C26H24P2, CAS is 1663-45-2, about Inclusion of bidentate phosphine molecules in the supercage of FAU zeolite. Author is Okumura, Kazu; Morita, Sachiko; Ohtsuki, Akimichi; Takaba, Hiromitsu.

Bidentate phosphines (Ph2P(CH2)nPPh2) with different alkyl chain lengths (n = 1-10) were included in the supercage (SC) of FAU-zeolite. Thermal treatment of the mixture of a bidentate phosphines and FAU-zeolite at 443 K resulted in the inclusion of the former into the SC, with ≤ 0.75 mols. per SC. The included mols. were strongly bound by FAU-zeolite, with desorption observed at higher temperatures compared to those of unloaded ones. The sp. surface area of the FAU-zeolite decreased linearly with an increase in the number of phosphines included. This tendency was more emphasized in phosphines with n = 6-10 compared with those with n = 1-5. A characteristic shift in the C-C stretching band of the benzene ring was observed in the Fourier-transform IR spectroscopy (FT-IR) spectrum, due to the strong interaction between bidentate phosphines and FAU-zeolite; the extent was more when using *BEA-loaded ones. Formation of the inclusion compounds between bidentate phosphines and FAU zeolites was observed with the mol. dynamics (MD) calculations The bidentate phosphines included in the SC of the FAU-zeolite were reacted with PdCl2 to form Pd complexes. The detailed anal. of the Pd complexes with Pd K-edge EXAFS revealed a characteristic decrease in the Pd-Cl bond distance with the use of complexes with n = 3 and 4, suggesting that the local structure around Pd was distorted through the interaction of the Pd complexes with the pores of the FAU-zeolite. The Pd complexes included in the SC were active for allylic alkylation between allyl Me carbonate and Et acetoacetate.

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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. 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 Photophysical Properties of Cyclometalated Platinum(II) Diphosphine Compounds in the Solid State and in PMMA Films. Author is Coffey, Belle; Clough, Lily; Bartkus, Daphne D.; McClellan, Ian C.; Greenberg, Matthew W.; LaFratta, Christopher N.; Tanski, Joseph M.; Anderson, Craig M..

Platinum(II) compounds were synthesized with both chelate cyclometalated ligands and chelate diphosphine ligands. The cyclometalated ligands include phenylpyridine and a benzothiophene-containing ligand. The three new benzothiophene compounds were characterized by NMR (NMR) spectroscopy, high-resolution mass spectrometry (HR-MS), and photophys. measurements. In the case of one compound, L1-DPPM, the structure was determined by single crystal X-ray diffraction. The structural coherence of the noncrystalline emissive solid state was measured by X-ray total scattering real space pair distribution function anal. Quantum yield values of all of the platinum compounds measured in the solid state and in PMMA films were much greater than in solution

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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

The preparation of ester heterocycles mostly uses heteroatoms as nucleophilic sites, which are achieved by intramolecular substitution or addition reactions. Compound: 1,2-Bis(diphenylphosphino)ethane( cas:1663-45-2 ) is researched.Category: chiral-nitrogen-ligands.Domingo-Legarda, Pablo; Casado-Sanchez, Antonio; Marzo, Leyre; Aleman, Jose; Cabrera, Silvia published the article 《Photocatalytic Water-Soluble Cationic Platinum(II) Complexes Bearing Quinolinate and Phosphine Ligands》 about this compound( cas:1663-45-2 ) in Inorganic Chemistry. Keywords: platinum quinolinate phosphine complex preparation photocatalyst electrochem luminescence; crystal structure platinum quinolinate phosphine complex. Let’s learn more about this compound (cas:1663-45-2).

Cationic Pt(II) complexes ([Pt(QO/S)(PΛP)]X), having 8-oxy or 8-thioquinolinate (QO/S) and seven different mono- or bidentate phosphines as ligands, have been synthesized and characterized. The photophys., stability, and photocatalytic properties of those complexes were studied and compared to that of the parent [Pt(QO/S)(dmso)(Cl)]. The coordination of phosphines induced a red-shift in the absorption energy of the MLCT band, whereas the emission wavelength of the complexes only depended on the nature of the quinolinate ligand. Moreover, the photocatalytic activity of the Pt(II) complexes was evaluated in the oxidation of sulfides using atm. oxygen as an oxidant. All the complexes were active photocatalysts for that transformation, with [Pt(QO)(BINAP)]Cl and [Pt(QO)(SEGPHOS)]Cl (BINAP: 2,2′-bis(diphenylphosphino)-1,1′-binaphthyl, SEGPHOS: (4,4′-bibenzodioxole)-5,5′-diyldiphosphine) exhibiting high catalytic performance and stability. In addition, the enhanced water solubility of the complexes allowed performance of the photooxidation reaction under environmentally friendly conditions. In particular, the catalyst [Pt(QS)(dppe)]Cl, bearing 8-thioquinolinate and diphenylphosphinoethate (dppe) as ligands, successfully catalyzed the oxidation of a variety of sulfides using water as a solvent.

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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

In organic chemistry, atoms other than carbon and hydrogen are generally referred to as heteroatoms. The most common heteroatoms are nitrogen, oxygen and sulfur. Now I present to you an article called A Crystalline Iron Terminal Methylidene, published in 2021-10-20, which mentions a compound: 1663-45-2, mainly applied to crystalline iron terminal methylidene, Quality Control of 1,2-Bis(diphenylphosphino)ethane.

Iron methylidene species are alleged intermediates in the Fischer-Tropsch process and in olefin cyclopropanation, yet iron methylidene complexes with unambiguously established mol. and electronic structures remain elusive. In this study, we characterize an iron terminal methylidene complex by single-crystal X-ray diffractometry (scXRD), CHN combustion elemental anal., 1H/13C/31P/1H-13C NMR, and zero-field 57Fe Mössbauer spectroscopy and study its reactivity. A series of closely related complexes in different oxidation states were synthesized, isolated and characterized in order to validate the electronic structure of the title methylidene complex. The computational anal. substantiates the proposed Fischer-type electronic description while emphasizing high Fe=CH2 bond covalency, considerable double bond order, and thus, substantial alkylidene character.

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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

The chemical properties of alicyclic heterocycles are similar to those of the corresponding chain compounds. Compound: 1,2-Bis(diphenylphosphino)ethane, is researched, Molecular C26H24P2, CAS is 1663-45-2, about Ruthenium(II) Diphosphine Complexes with Mercapto Ligands That Inhibit Topoisomerase IB and Suppress Tumor Growth In Vivo, the main research direction is melanoma antitumor lung breast cancer hTopIB docking ruthenium complexes.Name: 1,2-Bis(diphenylphosphino)ethane.

Ruthenium(II) complexes (Ru1-Ru5), with the general formula [Ru(N-S)(dppe)2]PF6, bearing two 1,2-bis(diphenylphosphino)ethane (dppe) ligands and a series of mercapto ligands (N-S), have been developed. The combination of these ligands in the complexes endowed hydrophobic species with high cytotoxic activity against five cancer cell lines. For the A549 (lung) and MDA-MB-231 (breast) cancer cell lines, the IC50 values of the complexes were 288- to 14-fold lower when compared to cisplatin. Furthermore, the complexes were selective for the A549 and MDA-MB-231 cancer cell lines compared to the MRC-5 nontumor cell line. The multitarget character of the complexes was investigated by using calf thymus DNA (CT DNA), human serum albumin, and human topoisomerase IB (hTopIB). The complexes potently inhibited hTopIB. In particular, complex [Ru(dmp)(dppe)2]PF6 (Ru3) (I), bearing the 4,6-diamino-2-mercaptopyrimidine (dmp) ligand, effectively inhibited hTopIB by acting on both the cleavage and religation steps of the catalytic cycle of this enzyme. Mol. docking showed that the Ru1-Ru5 complexes have binding affinity by active sites on the hTopI and hTopI-DNA, mainly via π-alkyl and alkyl hydrophobic interactions, as well as through hydrogen bonds. Complex Ru3 displayed significant antitumor activity against murine melanoma in mouse xenograph models, but this complex did not damage DNA, as revealed by Ames and micronucleus tests.

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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

Product Details of 1663-45-2. 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: 1,2-Bis(diphenylphosphino)ethane, is researched, Molecular C26H24P2, CAS is 1663-45-2, about Redox-Induced Structural Reorganization Dictates Kinetics of Cobalt(III) Hydride Formation via Proton-Coupled Electron Transfer. Author is Kurtz, Daniel A.; Dhar, Debanjan; Elgrishi, Noemie; Kandemir, Banu; McWilliams, Sean F.; Howland, William C.; Chen, Chun-Hsing; Dempsey, Jillian L..

Two-electron, one-proton reactions of a family of [CoCp(dxpe)(NCCH3)]2+ complexes (Cp = cyclopentadienyl, dxpe = 1,2-bis(di(aryl/alkyl)phosphino)ethane) form the corresponding hydride species [HCoCp(dxpe)]+ (dxpe = dppe (1,2-bis(diphenylphosphino)ethane), depe (1,2-bis(diethylphosphino)ethane), and dcpe (1,2-bis(dicyclohexylphosphino)ethane)) through a stepwise proton-coupled electron transfer process. For three [CoCp(dxpe)(NCCH3)]2+ complexes, peak shift anal. was employed to quantify apparent proton transfer rate constants from cyclic voltammograms recorded with acids ranging 22 pKa units. The apparent proton transfer rate constants correlate with the strength of the proton source for weak acids, but these apparent proton transfer rate constants curiously plateau (kpl) as the reaction becomes increasingly exergonic. The absolute apparent proton transfer rate constants across both these regions correlate with the steric bulk of the chelating diphosphine ligand, with bulkier ligands leading to slower kinetics (kplateau,depe = 3.5 x 107 M-1 s-1, kplateau,dppe = 1.7 x 107 M-1 s-1, kplateau,dcpe = 7.1 x 104 M-1 s-1). Mechanistic studies were conducted to identify the cause of the aberrant kPTapp-ΔpKa trends. When deuterated acids are employed, deuterium incorporation in the Cp ring is observed, indicating protonation of the CoCp(dxpe) species to form the corresponding hydride proceeds via initial ligand protonation. Digital simulations of cyclic voltammograms show ligand loss accompanying initial reduction gates subsequent PCET activity at higher driving forces. Together, these experiments reveal the details of the reaction mechanism: reduction of the Co(III) species is followed by dissociation of the bound acetonitrile ligand, subsequent reduction of the unligated Co(II) species to form a Co(I) species is followed by protonation, which occurs at the Cp ring, followed by tautomerization to generate the stable Co(III)-hydride product [HCoCp(dxpe)]+. Anal. as a function of chelating disphosphine ligand, solvent, and acid strength reveals that the ligand dissociation equilibrium is directly influenced by the steric bulk of the phosphine ligands and gates protonation, giving rise to the plateau of the apparent proton transfer rate constant with strong acids. The complexity of the reaction mechanism underpinning hydride formation, encompassing dynamic behavior of the entire ligand set, highlights the critical need to understand elementary reaction steps in proton-coupled electron transfer reactions.

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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

In general, if the atoms that make up the ring contain heteroatoms, such rings become heterocycles, and organic compounds containing heterocycles are called heterocyclic compounds. An article called Model compound of [FeFe]-hydrogenase active site employing [2Fe-2S] subunit as non-innocent [4Fe-4S] cluster and its proton reduction performance, published in 2020-04-17, which mentions a compound: 1663-45-2, Name is 1,2-Bis(diphenylphosphino)ethane, Molecular C26H24P2, Recommanded Product: 1,2-Bis(diphenylphosphino)ethane.

Synthesis of model compound of [FeFe]-hydrogenase active site is a promising and effective method to produce hydrogen. [μ-(SCH(CH2CH3)CH2S)-Fe2(CO)5]2-(κ1-DPPE) (compound 1) and [μ-(SCH(CH2CH3)CH2S)] Fe2(CO)5 (κ1-DPPM) (compound 2) were designed and synthesized. Compared 1 and 2 via IR, X-ray single crystal diffraction and CV, it was found that even through 1 and 2 shared similar electronic environment as well as crystal structure features, 1 with two sym. [2Fe-2S] subsites had distinct reduction peaks and also showed higher electrocatalytic proton reduction efficiency in the presence of equivalent amount of HOAc, which indicated two sym. [2Fe-2S] subsites played different roles in the process of proton reduction Furthermore, -(κ1-DPPE)-[2Fe-2S] moiety with variable valence state in 1 can mimic the [4Fe-4S] cluster and serve as an electron shuttle.

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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

The preparation of ester heterocycles mostly uses heteroatoms as nucleophilic sites, which are achieved by intramolecular substitution or addition reactions. Compound: 1,2-Bis(diphenylphosphino)ethane( cas:1663-45-2 ) is researched.Electric Literature of C26H24P2.Boelter, Scott D.; Davies, Dan R.; Margl, Peter; Milbrandt, Kara A.; Mort, Darrek; Vanchura, Britt A.; Wilson, David R.; Wiltzius, Molly; Rosen, Mari S.; Klosin, Jerzy published the article 《Phospholane-Based Ligands for Chromium-Catalyzed Ethylene Tri- and Tetramerization》 about this compound( cas:1663-45-2 ) in Organometallics. Keywords: diphosphine chromium complex preparation structure oligomerization catalyst; oligomerization ethylene preparation hexene octene chromium diphosphine catalyst screening. Let’s learn more about this compound (cas:1663-45-2).

Chromium trichloride and tetracarbonyl diphosphine complexes were prepared and evaluated as catalysts for ethylene oligomerization. Chromium complexes with bis(phospholane) ligands were synthesized and evaluated for ethylene tetramerization in a high-throughput reactor. Three ligand parameters-the phospholane substituent, the ligand backbone, and the type of phosphine (cyclic vs. acyclic) – were investigated. The size of the phospholane substituent was found to impact the selectivity of the resulting catalysts, with smaller substituents leading to the production of larger proportions of 1-octene. Changing the ligand backbone from 1,2-phenylene to ethylene did not impact catalysis, but the use of acyclic phosphines in place of the cyclic phospholanes had a detrimental effect on catalytic activity. Selected phospholane-chromium complexes were evaluated in a 300 mL Parr reactor at 70°C and 700 psi of ethylene pressure and the ethylene oligomerization performance was consistent with that observed in the smaller, high-throughput reactor. MeDuPhos-CrCl3(THF) gave activity and selectivity for 1-octene (54.8 wt %) similar to the state-of-the-art i-PrPNP-CrCl3(THF) (64.0 wt %), while EtDuPhos-CrCl3(THF) exhibited even higher activity, with catalyst selectivity shifted toward 1-hexene production (90 wt %). These results are surprising given the prevalence of the aryl phosphine motif in ligands used in ethylene oligomerization catalysts and the inferior performance of previously reported catalysts with alkyl phosphine-containing ligands.

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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

In organic chemistry, atoms other than carbon and hydrogen are generally referred to as heteroatoms. The most common heteroatoms are nitrogen, oxygen and sulfur. Now I present to you an article called Thermogravimetric and kinetic study of new bis(iminophosphorane)ethane solvates, published in 2020-08-31, which mentions a compound: 1663-45-2, mainly applied to bisiminophosphorane solvate preparation thermal stability crystal structure, Product Details of 1663-45-2.

Thermal and crystallog. characterization of one solvent-free bis(iminophosphorane)ethane (BIPE) form and three solvates with acetonitrile (ACN), DMSO (DMSO) and toluene is presented. Thermal behaviors of new compounds indicate that the solvent is removed differently from the BIPE structure, accordingly with the stoichiometric solvent mol. amount incorporated. Thus, the solvent-free BIPE reveals high thermal stability up to 315°C, while BIPE solvates have a similar pattern behavior with low stability about 130°C. The kinetic parameters of the thermal decomposition process were determined by three different methods Flynn-Wall-Ozawa, Kissinger-Akahira-Sunose and nonparametric kinetic. Crystallog. data revealed that the solvent plays the role of space filler without strong interactions with host mols. Guest-free BIPE, BIPE0.5ACN and BIPE0.35DMSO crystallized in monoclinic C2/c (15) space group, while BIPETOLUENE in a triclinic P – 1 (2) one. Crystallog. and thermogravimetric data show a good correlation between mol. structures and activation energies.

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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

Formula: C26H24P2. 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: 1,2-Bis(diphenylphosphino)ethane, is researched, Molecular C26H24P2, CAS is 1663-45-2, about Promotion of diphosphine ligands (PPh2(CH2)nPPh2, n = 1, 2, 3, 5, 6) for supported Rh/SiO2 catalysts in heterogeneous ethene hydroformylation. Author is Huang, Ning; Liu, Boyang; Lan, Xiaocheng; Yan, Binhang; Wang, Tiefeng.

Hydroformylation is applied in industry to convert olefin and syngas to value-added products. Rh promoted by phosphine ligands are highly efficient catalysts for this reaction. The promotion mechanism of phosphines has been well studied in homogeneous system. It is important to extend the use of these ligands to heterogeneous system. The dpp* (PPh2(CH2)nPPh2, n = 1, 2, 3, 5 and 6) ligands were introduced to Rh/SiO2 and the ethene gaseous hydroformylation reaction was tested. Compared to unmodified Rh/SiO2, all the catalysts modified by phosphine showed enhanced activity (∼100 times higher for the best ligand) and oxygenate selectivity (from 65% to ∼97%). Among the investigation, L5 and L6 ligands exhibited the best performance while L1 and L2 only gave slight promotion. CO cutoff transient experiments were designed to identify the rate-limiting step (RLS) of hydroformylation reaction over the present catalysts. A mechanism was proposed for the change of RLS over the phosphine modified catalysts. Combined with in situ FTIR results, the relationship between electronic state and catalytic activity of the catalyst was verified.

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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