Day: April 8, 2022

Jiao, Meichen; Huang, Ju; Xu, Hao; Jiang, Jingang; Guan, Yejun; Ma, Yanhang; Wu, Peng published the article 《ECNU-36: A Quasi-Pure Polymorph CH Beta Silicate Composed of Hierarchical Nanosheet Crystals for Effective VOCs Adsorption》. Keywords: nanosheet crystal polymorph adsorption VOC; adsorption; all-silica; high hydrophobicity; polymorph CH; zeolite beta.They researched the compound: 1,5-Dibromopentane( cas:111-24-0 ).Reference of 1,5-Dibromopentane. 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:111-24-0) here.

A quasi-pure CH polymorph of microporous zeolite beta, named ECNU-36, was obtained as a highly crystalline silicate using 1,5-bis(tetramethylimidazolium) hydroxide as organic structure-directing agent (OSDA) in fluoride media. An appropriate concentration of free fluoride in the synthetic mother liquor was crucial to purify the CH-phase. The framework structure of ECNU-36 consists of polymorph CH ( > 95%) and polymorph B, elucidated by a combination of PXRD data, DIFFaX simulation, EDT, and HRTEM techniques. For the first time, the framework structure of beta CH polymorph was directly confirmed and solved using electron diffraction data. The pure-silica ECNU-36 showed an unusual crystal morphol., composed of stacked nanosheets, with typical 17 nm thickness and exposed {100} facets, which exhibited attractive adsorption performance for hydrocarbons and aromatics

Here is just a brief introduction to this compound(111-24-0)Reference of 1,5-Dibromopentane, more information about the compound(1,5-Dibromopentane) is in the article, you can click the link below.

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

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 Fully solvated, monomeric Re(II) complexes: insights into the chemistry of [Re(NCCH3)6]2+. Author is Bolliger, Robin; Meola, Giuseppe; Braband, Henrik; Blacque, Olivier; Siebenmann, Lukas; Nadeem, Qaisar; Alberto, Roger.

The oxidation of [Re(η6-C10H8)2]+ with Ag(I) in MeCN yields [Re(NCCH3)6]2+. This fully solvated ReII compound was characterized by spectroscopic methods and x-ray structure analyses. [Re(NCCH3)6]2+ acts as a precursor complex for a variety of substitution reactions. Treatment with monodentate tri-Ph phosphine (PPh3) and bidentate 1,2-bis(diphenylphosphino)ethane (dppe) yields the ReI complexes [trans-Re(PPh3)2(NCCH3)4]2+ and [trans-Re(dppe)2(NCCH3)2]+, resp. [Trans-Re(dppe)2(NCCH3)2]+ is oxidized under mild conditions by AgI to its ReII analog [trans-Re(dppe)2(NCCH3)2]2+. Reactions of [Re(NCCH3)6]2+ with a halide mixture consisting of NaX and AgX (X = Cl, I) gave the corresponding ReIII complexes [trans-ReX2(NCCH3)4]+. [Trans-ReBr2(NCCH3)4]+ can be obtained directly from [Re(η6-C10H8)2]+ by oxidation with FeBr3 in MeCN. The title compound is thus a convenient starting material for ReII and ReIII complexes by simple solvent exchange, which are otherwise difficult to access.

Here is just a brief introduction to this compound(1663-45-2)HPLC of Formula: 1663-45-2, more information about the compound(1,2-Bis(diphenylphosphino)ethane) is in the article, you can click the link below.

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

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.

Here is just a brief introduction to this compound(1663-45-2)Formula: C26H24P2, more information about the compound(1,2-Bis(diphenylphosphino)ethane) is in the article, you can click the link below.

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

Quality Control of 1,5-Dibromopentane. Aromatic compounds can be divided into two categories: single heterocycles and fused heterocycles. Compound: 1,5-Dibromopentane, is researched, Molecular C5H10Br2, CAS is 111-24-0, about Chemically stable poly(meta-terphenyl piperidinium) with highly conductive side chain for alkaline fuel cell membranes. Author is Lu, Chuanrui; Long, Chuan; Li, Yunxi; Li, Ziming; Zhu, Hong.

Poly(arylene piperidine)s (PAPs) backbones, which do not contain unstable ether bonds, was synthesized by one-pot, metal-free superacid-catalyzed polymerization for anion exchange membranes (AEMs) preparation Meta-terphenyl as a monomer of polymer to regulate the morphol. and properties of AEM was also used due to its spatially torsional configuration instead of the recently reported linear structure of meta-terphenyl. Long flexible hydrophilic chains were grafted onto poly(meta terphenyl piperidinium) (m-PTP) backbone to form four cationic functionalized side chains, promoting efficient transfer of OH- and optimizing the hydrophilic/hydrophobic microphase separation structure. The resulting AEM shows a high ion conductivity of 164 mS/cm (m-PTP-TFPE-21) at 80°C. Furthermore, stable piperidine cation and long alkyl spacer chain contributed to the excellent alkali stability of m-PTP-TFPE-TQA membrane which shows only 11.67% and 12.73% degradation in ion conductivity and IEC, resp., after soaking in 2 M NaOH at 80°C for 1500 h. The peak power d. of the H2/O2 single cell using m-PTP-TFPE-14 is 269 mW/cm2 at a c.d. of 540 mA/cm2 at 80°C.

Here is just a brief introduction to this compound(111-24-0)Quality Control of 1,5-Dibromopentane, more information about the compound(1,5-Dibromopentane) is in the article, you can click the link below.

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 compounds have physiologically active properties, and their biological properties are often attributed to the heteroatoms contained in their molecules, and most of these heteroatoms also appear in cyclic structures. A Journal, Article, Research Support, Non-U.S. Gov’t, Bioorganic & Medicinal Chemistry Letters called Fragment based search for small molecule inhibitors of HIV-1 Tat-TAR, Author is Zeiger, Mirco; Stark, Sebastian; Kalden, Elisabeth; Ackermann, Bettina; Ferner, Jan; Scheffer, Ute; Shoja-Bazargani, Fatemeh; Erdel, Veysel; Schwalbe, Harald; Goebel, Michael W., which mentions a compound: 20198-19-0, SMILESS is O=C1NC(N)=NC2=C1C=CC=C2, Molecular C8H7N3O, Formula: C8H7N3O.

Basic mol. building blocks such as benzene rings, amidines, guanidines, and amino groups have been combined in a systematic way to generate ligand candidates for HIV-1 TAR RNA. Ranking of the resulting compounds was achieved in a fluorimetric Tat-TAR competition assay. Although simple mols. such as phenylguanidine are inactive, few iteration steps led to a set of ligands with IC50 values ranging from 40 to 150 μM. 1,7-Diaminoisoquinoline 17 and 2,4,6-triaminoquinazoline 22 have been further characterized by NMR titrations with TAR RNA. Compound 22 is bound to TAR at two high affinity sites and shows slow exchange between the free ligand and the RNA complex. These results encourage investigations of dimeric ligands built from two copies of compound 22 or related heterocycles.

Here is just a brief introduction to this compound(20198-19-0)Formula: C8H7N3O, more information about the compound(2-Aminoquinazolin-4(3H)-one) is in the article, you can click the link below.

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 Reactivity of anode-generated dialkyl trimethylsilyl phosphite cation radicals, published in 1988-01-31, which mentions a compound: 20198-19-0, Name is 2-Aminoquinazolin-4(3H)-one, Molecular C8H7N3O, Application In Synthesis of 2-Aminoquinazolin-4(3H)-one.

The electrochem. oxidation of diethyltrimethylsilylphosphite and dibutyltrimethylsilylphosphite was studied in the presence of benzene and alkylbenzene using the method of competitive reactions. The assumption that the highly active electrophilic particles, cation radicals of dialkyltrimethylsilylphosphites, are playing role in the electrochem. process was confirmed. The selectivity of the substitution reaction of (RO)2POSiMe3 with alkylbenzene was studied as a function of the R position. A good correlation was observed between electrophilic constants and electrochem. data.

Here is just a brief introduction to this compound(20198-19-0)Application In Synthesis of 2-Aminoquinazolin-4(3H)-one, more information about the compound(2-Aminoquinazolin-4(3H)-one) is in the article, you can click the link below.

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

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 Biological evaluation and molecular docking of substituted quinazolinones as antimicrobial agents.Name: 2-Aminoquinazolin-4(3H)-one.

Antibiotic resistance in the community is a growing public health concern due to the continued emergence of multi drug resistant bacterial strains. In view of this fact, the design and synthesis of newer antibacterials are of immense significance and continue to attract the attention of numerous medicinal chemists. The aim of this study was to investigate the effect of four quinazolinone derivatives (Ia, II, III and IV) on the microbial cell morphol. and genes coded for rRNA subunits. It was extended also to elucidate the effect of the most active derivatives on DNA-gyrase enzyme by performing a mol. docking study. Quinazolinone derivatives revealed good anti-bacterial activities, especially against Gram-pos. strains through their interaction with cell wall and DNA structures. The tested compounds showed moderate activity against fungal strains through affecting the internal structures of fungal cell in addition to studied genes. Compound II was found to be the most active gyrase inhibitor as illustrated by the docking study. Conclusion: The type and position of chem. substituents confer the antimicrobial activity of quinazolinone.

Here is just a brief introduction to this compound(20198-19-0)Name: 2-Aminoquinazolin-4(3H)-one, more information about the compound(2-Aminoquinazolin-4(3H)-one) is in the article, you can click the link below.

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: 5-(4-Pyridyl)-1H-tetrazole( cas:14389-12-9 ) is researched.Safety of 5-(4-Pyridyl)-1H-tetrazole.Sha, Jing-Quan; Sun, Jing-Wen; Wang, Cheng; Li, Guang-Ming; Yan, Peng-Fei; Li, Meng-Ting; Liu, Ming-Yuan published the article 《Syntheses of POM-templated MOFs containing the isomeric pyridyltetrazole》 about this compound( cas:14389-12-9 ) in CrystEngComm. Keywords: silver pyridyltetrazole polyoxometalate template MOF hydrothermal preparation crystal structure; luminescence silver pyridyltetrazole polyoxometalate template MOF. Let’s learn more about this compound (cas:14389-12-9).

By introducing the isomeric pyridyltetrazole into POMs, four POM-templated MOFs compounds, H[Ag6(2-pytz)4(H2O)4][PW12O40]·6H2O (1), [Ag3(3-pytz)2]2[AgPW12O40] (2), H[KAg7(4-pytz)5][SiW12O40] (3), {H[NaAg7(4-pytz)5(H2O)0.5][GeMo12O40]}2 (4) [pytz = 5-(pyridyl) tetrazolate], were hydrothermally synthesized and characterized by routine methods and single-crystal x-ray crystallog. Due to 2-pytz as a bridging linker and chelator, compound 1 displays a 2D MOF with a void (∼19.1 × 8.8 Å), in which the Keggin anions as sandwich templates locate in the adjacent two voids. In 2, 3-pytz as a shorter radiating linker generates a compacted 2D MOF, in which the Keggin anions as chain templates direct the formation of a stair-like MOF. In the isostructural compounds 3 and 4, 4-pytz as the bridging and radiating linkers form 3D covalent MOFs with larger voids (∼25.3 × 12.5 Å), in which the Keggin anions as double-templates occupy the voids in a “”shoulder-to-shoulder”” mode. In addition, the photoluminescence of the compounds were studied.

Here is just a brief introduction to this compound(14389-12-9)Safety of 5-(4-Pyridyl)-1H-tetrazole, more information about the compound(5-(4-Pyridyl)-1H-tetrazole) is in the article, you can click the link below.

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

Formula: C5H10Br2. Aromatic heterocyclic compounds can also be classified according to the number of heteroatoms contained in the heterocycle: single heteroatom, two heteroatoms, three heteroatoms and four heteroatoms. Compound: 1,5-Dibromopentane, is researched, Molecular C5H10Br2, CAS is 111-24-0, about Synthesis and biological evaluation of thiazolidinedione derivatives of chalcones and flavones as antihyperglycemic and antidyslipidemic agents. Author is Satyanarayana, Mavurapu; Shukla, Poonam; Tripathi, Brajendra K.; Tiwari, Priti; Srivastava, Arvind K.; Pratap, Ram.

A series of chalcone and flavone derivatives I [R1 = 4-MeOC6H4, 1,3-benzodioxol-5-yl; n = 2, 3] II [R = 3,5-di-OCH2Ph, 3,4-di-OCH2Ph, 3,4,5-tri-MeO, 3,4-di-MeO, 3,5-di-MeO; n = 1, 2] based on 2,4-thiazolidinedione had been synthesized and evaluated for in vivo antihyperglycemic activity in sucrose loaded (SLM) and streptozotocin (STZ) induced diabetic animal models and also for antidyslipidemic activity in the triton model. Compounds II [R = 3,4,5-tri-MeO, 3,4-di-MeO, 3,5-di-MeO; n = 2] exhibited potent blood glucose-lowering activity in both SLM and STZ models. Compounds I [R1 = 1,3-benzodioxol-5-yl; n = 3], and II [R = 3,4,5-tri-MeO, 3,4-di-MeO, 3,5-di-MeO; n = 1, 2] showed moderate lipid-lowering activity. The selected most potent compounds I [R1 = 1,3-benzodioxol-5-yl; n = 3] and II [R = 3,4,5-tri-MeO; n = 2] were also studied in db/db mice for both antihyperglycemic and antidyslipidemic activity.

Here is just a brief introduction to this compound(111-24-0)Formula: C5H10Br2, more information about the compound(1,5-Dibromopentane) is in the article, you can click the link below.

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

Product Details of 14389-12-9. Aromatic heterocyclic compounds can also be classified according to the number of heteroatoms contained in the heterocycle: single heteroatom, two heteroatoms, three heteroatoms and four heteroatoms. Compound: 5-(4-Pyridyl)-1H-tetrazole, is researched, Molecular C6H5N5, CAS is 14389-12-9, about A solid-state density functional theory investigation of the effect of metal substitution (Metal = Mn, Cd, Co) on the terahertz spectra of isomorphous molecular metal 5-(4-pyridyl)tetrazolato complexes. Author is Pellizzeri, Steven; Witko, Ewelina M.; Korter, Timothy M.; Zubieta, Jon.

The crystal structure and exptl. terahertz spectroscopy of an isomorphous series [Mn(C6H4N5)2(H2O)4]·2H2O (Mn-4PT), [Co(C6H4N5)2(H2O)4]·2H2O (Co-4PT), and [Cd(C6H4N5)2(H2O)4]·2H2O (Cd-4PT) were compared using solid-state d. functional theory (DFT) simulations. The effect of the central metal atom was studied to determine the influence on the low energy lattice and mol. vibrations exhibited at 10-100 cm-1, known as the terahertz (THz) region. Using solid-state DFT the normal modes of these THz vibrations were determined and the mass and size of the metal center has a large effect in this region. Each complex exhibited common vibrational modes involving whole ligand motion around the central metal atom. These vibrations shift to lower frequencies with a drastic mass increase; however, this trend is reversed with the smaller mass change between the Mn and Co due to the stronger Co-N bond compared to the Mn-N bond.

Here is just a brief introduction to this compound(14389-12-9)Product Details of 14389-12-9, more information about the compound(5-(4-Pyridyl)-1H-tetrazole) is in the article, you can click the link below.

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