Month: April 2022

Computed Properties of C6H5N5. Aromatic compounds can be divided into two categories: single heterocycles and fused heterocycles. Compound: 5-(4-Pyridyl)-1H-tetrazole, is researched, Molecular C6H5N5, CAS is 14389-12-9, about Solid state coordination chemistry of microporous metal-organic frameworks of the cadmium(II)-4-pyridyltetrazolate family: the structural influences of chloride incorporation. Author is Ouellette, Wayne; Zubieta, Jon.

While the metal-organic framework [Cd4(OH)2(4-pt)6(DMF)4]·12DMF (1·12DMF) (4-pt = 4-pyridyltetrazolate) is constructed from binuclear metal subunits, linked into porous {Cd2(OH)(DMF)2(4-pt)3}6 cages, introduction of increasing concentrations of chloride yields the 3-dimensional framework materials, [Cd4Cl3(4-pt)4(OH)(DMF)3]·8DMF·14MeOH (2·8DMF·14MeOH) and [Cd5Cl6(4-pt)(DMF)2(H2O)2]·10DMF (3·10DMF), constructed from tetranuclear and chain building blocks, resp.

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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

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: 2-Aminoquinazolin-4(3H)-one, is researched, Molecular C8H7N3O, CAS is 20198-19-0, about Quinazolines. VIII. Reaction of 2-aminoquinazol-4-one with unsaturated acids.Category: chiral-nitrogen-ligands.

Pyrimidoquinazolinediones I (R = H, Me, Ph, R1 = R2 = H; R = R1 = H, R2 = Me; R = R1 = Me, R2 = H) were obtained in 61-90% yields by cyclocondensation of RR1C:CR2CO2H with 2-amino-4(3H)-quinazolinone 2 h at 160-5°.

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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.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

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: 3411-48-1, is researched, SMILESS is C1=CC2=C(C=C1)C(=CC=C2)P(C1=CC=CC2=C1C=CC=C2)C1=CC=CC2=C1C=CC=C2, Molecular C30H21PJournal, Tetrahedron Letters called Visible light-induced 4-phenylthioxanthone-catalyzed aerobic oxidation of triarylphosphines, Author is Ding, Aishun; Li, Shijie; Chen, Yang; Jin, Ruiwen; Ye, Cong; Hu, Jianhua; Guo, Hao, the main research direction is arylphosphine light induced phenylthioxanthone catalyzed aerobic oxidation; phosphine oxide aryl preparation.Recommanded Product: 3411-48-1.

The authors report herein a visible light-induced oxidation of triarylphosphines under aerobic condition with excellent functional group tolerance. In this transformation, the photo catalyst 4-phenylthioxanthone acted as a photosensitizer for the in situ generation of singlet O. This new approach provided a cheaper and greener method for the preparation of phosphine oxide, showing great advantages in environmental protocols.

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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

Kulaga, Damian; Jaskowska, Jolanta; Satala, Grzegorz published an article about the compound: 1,5-Dibromopentane( cas:111-24-0,SMILESS:BrCCCCCBr ).Product Details of 111-24-0. 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:111-24-0) through the article.

Schizophrenia and depression are diseases that significantly impede human functioning in society. Current antidepressant drugs are not fully effective. According to literature data, the effect on D2R or 5-HT1AR can effectively reduce the symptoms of depression or schizophrenia. Recent research hypothetized that the synergism of both of these receptors can improve the effectiveness of therapy. Ipsapirone, a representative of long-chain arylpiperazines, is a known 5-HT1AR ligand that has antidepressant effect. This compound has no affinity for the D2R. Bearing in mind, we decided to design ligands with improved affinity to D2R and confirmed that in some cases elongation of the carbon linker or arylpiperazine exchange may have beneficial influence on the binding to D2R and 5-HT1AR. Four groups of ligands being ipsapirone analogs with Bu, pentyl, hexyl and stiffened xylene chains were designed. All compounds were obtained in solvent-free reactions supported by a microwave irradiation with an efficiency mainly above 60%. All ligands containing 1-(2-pyrimidinyl)piperazine exhibited high affinity to 5-HT1AR. In this case, chem. modifications within the chain did not affect the affinity to D2R. In the case of ligands containing 1-phenylpiperazine, 1-(3-trifluoromethylphenyl)piperazine, 1-(1-naphthyl)piperazine, and 1-(4-chlorophenyl)piperazine, elongation of carbon linker increases of affinity to D2R. For ligands containing 1- (2-pyridyl) piperazine, and 1-(2,3-dichlorophenyl)piperazine, we observed an opposite effect. For ligands containing 1-phenylpiperazine, 1-(2-methoxyphenyl)piperazine and 1-(2-pyridyl)piperazine, chain elongation had no effect on 5-HT1AR binding. In turn of ligands containing 1-(3-trifluoromethylphenyl)piperazine and 1- (2,3-dichlorophenyl)piperazine, we observed that elongation of carbon linker has a pos. influence to 5-HT1AR. Mol. modeling was used to support the SAR study.

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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

COA of Formula: C6H5N5. 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: 5-(4-Pyridyl)-1H-tetrazole, is researched, Molecular C6H5N5, CAS is 14389-12-9, about Loading of a Coordination Polymer Nanobelt on a Functional Carbon Fiber: A Feasible Strategy for Visible-Light-Active and Highly Efficient Coordination-Polymer-Based Photocatalysts.

To improve the photocatalytic properties of coordination polymers under irradiation in the visible-light region, coordination polymer nanobelts (CPNB) were loaded on functional carbon synthetic fibers (FCF) through the use of a simple colloidal blending process. The resulting coordination polymer nanobelt loaded functional carbon synthetic fibers composite material (CPNB/FCF) exhibited dramatically improved photocatalytic activity for the degradation of rhodamine B (RhB) under visible-light irradiation Optical and electrochem. methods illustrated the enhanced photocatalytic activity of CPNB/FCF originated from high separation efficiency of photogenerated electrons and holes on the interface of CPNB and FCF, which was produced by the synergy effect between them. In the composite material, the role of FCF could be described as photosensitizer and good electron transporter. For FCF, the number of functional groups on its surface has a significant influence on the photocatalytic performance of the resulting CPNB/FCF composite material, and an ideal FCF carrier was obtained as a highly efficient CPNB/FCF photocatalyst. CPNB/FCF showed outstanding stability during the degradation of rhodamine B (RhB); thus, the material is suitable for use as a photocatalyst in the treatment of organic dyes in water.

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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

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: 111-24-0, is researched, SMILESS is BrCCCCCBr, Molecular C5H10Br2Journal, International Journal of Hydrogen Energy called High chemical stability anion exchange membrane based on poly(aryl piperidinium): Effect of monomer configuration on membrane properties, Author is Long, Chuan; Wang, Zhihua; Zhu, Hong, the main research direction is polytriphenyl piperidine based anion exchange membrane preparation.SDS of cas: 111-24-0.

In recent years, ether-free polyaryl polymers prepared by superacid-catalyzed Friedel-Crafts polymerization have attracted great research interest in the development of anion exchange membranes(AEMs) due to their high alkali resistance and simple synthesis methods. However, the selection of monomers for high-performance polymer backbone and the relationship between polymer structure construction and properties need further investigated. Herein, a series of free-ether poly(aryl piperidinium) (PAP) with different polymer backbone steric construction were synthesized as stable anion exchange membranes. Meta-terphenyl, p-terphenyl and diphenyl-terphenyl copolymer were chosen as monomers to regulate the spatial arrangement of the polymer backbone, which tethered with stable piperidinium cation to improve the chem. stability. In addition, a multi-cation crosslinking strategy has been applied to improve ion conductivity and mech. stability of AEMs, and further compared with the performance of uncrosslinked AEMs. The properties of the resulting AEMs were investigated and correlated with their polymer structure. In particular, m-terphenyl based AEMs exhibited better dimensional stability and the highest hydroxide conductivity of 144.2 mS/cm at 80°C than other membranes, which can be attributed to their advantages of polymer backbone arrangement. Furthermore, the hydroxide conductivity of the prepared AEMs remains 80%-90% after treated by 2 M NaOH for 1600 h, exhibiting excellent alk. stability. The single cell test of m-PTP-20Q4 exhibits a maximum power d. of 239 mW/cm2 at 80°C. Hence, the results may guide the selection of polymer monomers to improve performance and alk. durability for anion exchange membranes.

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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

SDS of cas: 14389-12-9. 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: 5-(4-Pyridyl)-1H-tetrazole, is researched, Molecular C6H5N5, CAS is 14389-12-9, about New Cu(II) and Cd(II) coordination polymers employing 5-[N-acetato(4-pyridyl)]tetrazolate as a bridging ligand. Author is Yang, Gao-Wen; Li, Qiao-Yun; Wang, Jun; Yuan, Rong-Xin; Xie, Ji-Min.

Two coordination polymers [Cu(a4-ptz)2·2H2O]n, (1) and [{Cd(a4-ptz)·(H2O)2Cl}·H2O]n (2) (a4-ptz = 5-[N-acetato(4-pyridyl)]tetrazolate) were synthesized and characterized by elemental anal., IR spectroscopy, thermal anal., and X-ray crystal structure anal. Complex 1 exhibits a 2D square grid polymeric structure with dimensions of 1.220 0 nm × 1.220 0 nm. Complex 2 possesses a 1D Z-type polymeric chain, which contains four-membered ring (Cd2Cl2). The thermal stability of complex 2 up to about 280°C (TGA measurement) and their insolubility in common solvents make it a good candidate for potential fluorescent materials.

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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 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.

I hope my short article helps more people learn about this compound(1,2-Bis(diphenylphosphino)ethane)Recommanded Product: 1,2-Bis(diphenylphosphino)ethane. Apart from the compound(1663-45-2), you can read my other articles to know other related compounds.

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