Day: April 15, 2022

SDS of cas: 89972-77-0. 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: 4-(p-Tolyl)-2,2:6,2-terpyridine, is researched, Molecular C22H17N3, CAS is 89972-77-0, about Two CuCN hybrid networks with unusual topology tuned by terpyridine ligands. Author is Zhou, Xiao-Ping; Lin, Shi-Hong; Li, Dan; Yin, Ye-Gao.

This paper reports two structurally unique CuCN-terpyridine hybrid networks of 4′-p-tolyl-2,2′: 6′,2”-terpyridine (ttpy) prepared under solvothermal conditions: [(CuCN)5(ttpy)]n (1), [(CuCN)3(ttpy)]n (2). Complex 1 features a tri-layer structure with 3-connected binodal (8210)·(8210) topol., while complex 2 features an unusual honeycomb-like layer structure. The adjacent honeycomb-like layers consist of the opposite handed helical CuCN-ttpy chains. In both complexes, each ttpy coordinates two copper(I) atoms with short Cu-Cu distances, and the side pyridyl group rotates in a certain angle from the central pyridyl plane directing the formation of the diversified networks.

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Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

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, Journal of the Chemical Society, Chemical Communications called Coordination chemistry at a surface: polymetallic complexes prepared on quartz by alternate deposition of iron(II) and ruthenium(II) centers, Author is Liang, Yongwu; Schmehl, Russell H., which mentions a compound: 89972-77-0, SMILESS is CC1=CC=C(C2=CC(C3=NC=CC=C3)=NC(C4=NC=CC=C4)=C2)C=C1, Molecular C22H17N3, SDS of cas: 89972-77-0.

Polymetallic complexes having well defined geometries were prepared via attachment of an anchor ligand to a quartz surface followed by repeated sequential reaction with [Fe(OH2)6]2+ and a RuII complex having two tridentate bridging ligands rigidly fixed at 180°, [(tpy-ph-tpy)2Ru]Cl2 [tpy-ph-tpy = 1,4-di(2,2′,6′,2”-terpyridin-4′-yl)benzene].

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Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

Name: 4-(p-Tolyl)-2,2:6,2-terpyridine. 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: 4-(p-Tolyl)-2,2:6,2-terpyridine, is researched, Molecular C22H17N3, CAS is 89972-77-0, about Kinetics and potential well in electrochemical hydrogen evolution by [Co(4-tolyl-tpy)2]2+. Author is Padhi, Sumanta Kumar; Ahmad, Ejaz; Rai, Surabhi.

The ligand 4-tolyl-tpy [4-tolyl-tpy = 2,6-di(pyridin-2-yl)-4-p-tolylpyridine] and the corresponding cobalt complexes like [Co(4-tolyl-tpy)2]Cl2 and [Co(4-tolyl-tpy)2]Br3 has been synthesized and characterized by different spectroscopic and electrochem. methods. The electrochem. studies were carried out in 95:5 (volume/volume) DMF/H2O using acetic acid (AcOH) as a proton source. The faradaic efficiency found to be f = (86 ± 4) % using potential range -1.4 V to -1.7 V vs. SCE for a period of 1 h. The ic/ip value found to be 57.9 for a scan rate of 100 mV s-1, and TOF was calculated to be 652 s-1. The electrocatalytic H2 production by [Co(4-tolyl-tpy)2]2+ complex was also employed in phosphate buffer pH 7, and it shows the Faradaic efficiency of (88 ± 4%) within the overpotential range from -1.2 V to -1.5 V vs. SCE. The TOF of the reaction was found to be 3900 mmol of H2 per mol of catalyst per h. The compare of electrochem. proton reduction, as well as water reduction by [Co(4-tolyl-tpy)2]2+ with the basic scaffold [Co(tpy)2]2+, reveals that it shows higher catalytic activity and have lower overpotential of 150 mV for proton reduction and 100 mV for water reduction Various kinetics and spectroscopic studies are utilized to predict the mechanism for proton reduction The kinetic and mechanistic studies are depicted based on changes in absorbance with the addition of Co(Cp)2, followed by AcOH. The intermediates involved in the kinetic process was analyzed through global fitting and SVD anal. The formation of [CoI(L2)] → [CoIII(H)(L)(2L)] and [CoIII(L)(2L)S] → [CoII(L)2] are faster reactions in comparison to the formation of Co(III)-Hδ-···Hδ+ to evolve hydrogen (Where 2L is bidentate 4-toly-tpy and S = solvent). The pK value was calculated to be 16.5 for Co(III)-H species in DMF generated from CoI species i.e.CoI + H+ ⇄ Co(III)-H.

Although many compounds look similar to this compound(89972-77-0)Name: 4-(p-Tolyl)-2,2:6,2-terpyridine, numerous studies have shown that this compound(SMILES:CC1=CC=C(C2=CC(C3=NC=CC=C3)=NC(C4=NC=CC=C4)=C2)C=C1), has unique advantages. If you want to know more about similar compounds, you can read my other articles.

Reference:
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

SDS of cas: 89972-77-0. 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: 4-(p-Tolyl)-2,2:6,2-terpyridine, is researched, Molecular C22H17N3, CAS is 89972-77-0, about Photoelectric conversion at a [Ru(bpy)3]2+-based metallic triad anchored on ITO surface. Author is Farran, Rajaa; Jouvenot, Damien; Loiseau, Frederique; Chauvin, Jerome; Deronzier, Alain.

A tri-metallic triad based on a [Ru(bpy)3]2+ moiety connected to Fe(II) and Co(III) bis-terpyridine was grafted on an ITO electrode by a stepwise procedure. Under visible light, in the presence of a sacrificial electron donor, the system produces elec. current. The photo-current magnitude is compared to the one generated from a Co(III)-Ru(II) dyad and shows an increase of 40%.

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Reference:
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

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: 2834-05-1, is researched, SMILESS is O=C(O)CCCCCCCCCCBr, Molecular C11H21BrO2Journal, Materials Today Communications called A newly synthesized ionic liquid as an effective corrosion inhibitor for carbon steel in HCl medium: A combined experimental and computational studies, Author is Ozturk, Serkan; Gerengi, Husnu; Solomon, Moses M.; Gece, Gokhan; Yildirim, Ayhan; Yildiz, Mesut, the main research direction is tricationic surfactant ionic liquid steel corrosion inhibitor acid medium.Recommanded Product: 11-Bromoundecanoic acid.

Surfactants present exciting adsorption chem. due to their dual nature, i.e the present of the hydrophobic and hydrophilic parts in their structures. However, the inhibition performance of surfactants is influenced by their chem. structure as well as the nature of the electrolyte. In acidic media, high concentration of tri-cationic surfactants is required for effective surface protection. Herein, we report the synthesis of a novel tri-cationic surfactant containing three quaternized nitrogen atoms and its corrosion inhibitive effect for carbon steel in 1 M aqueous HCl medium. The mol. structure of the surfactant was elucidated by 1H NMR and 13C NMR spectroscopic techniques and its anti-corrosion activity was investigated by electrochem. impedance spectroscopy, potentiodynamic polarization and dynamic electrochem. impedance spectroscopy methods. The results obtained from the corrosion studies show that the synthesized surfactant is quite effective against the low carbon steel corrosion and at low inhibitor concentration The inhibition efficiency obtained at 5 mg/L concentration is above 90%, showing that the anti-corrosion effect of the synthesized surfactant on the metal surface is strong even at low inhibitor concentration Moreover, some physicochem. parameters namely, the critical micelle concentration, surface tension, micelle formation free energy, and emulsion stability have been calculated and used to explain the correlation with the corrosion inhibition mechanism. Addnl., to support the results from the electrochem. measurements, surface morphol. examination using energy dispersive X-ray spectroscopy (EDAX) and scanning electron microscope (SEM) methods have been performed. The EDAX and SEM results prove the adsorption of the tri-cationic surfactant mol. on the metal surface. The adsorption followed the Langmuir adsorption isotherm and calculated Kads (equilibrium constant of the adsorption process) value reflects strong interaction. More so, d. functional theory (DFT) results corroborate the exptl. results. The synthesized tri-cationic surfactant is a potential candidate for the formulation of acid corrosion inhibitor for acid cleaning applications.

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Reference:
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

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.Peru, Aurelien A. M.; Flourat, Amandine L.; Gunawan, Christian; Raverty, Warwick; Jevric, Martyn; Greatrex, Ben W.; Allais, Florent researched the compound: (S)-5-(Hydroxymethyl)dihydrofuran-2(3H)-one( cas:32780-06-6 ).Formula: C5H8O3.They published the article 《Chemo-enzymatic synthesis of chiral epoxides ethyl and methyl (S)-3-(oxiran-2-yl)propanoates from renewable levoglucosenone: an access to enantiopure (S)-dairy lactone》 about this compound( cas:32780-06-6 ) in Molecules. Keywords: levoglucosenone Baeyer Villiger oxidation acid hydrolysis hydrogenation; butyrolactone preparation green chem; octenyl tetrahydrofuranone preparation green chem; chirality; epoxide; flavor; levoglucosenone; total synthesis. We’ll tell you more about this compound (cas:32780-06-6).

Herein, starting from levoglucosenone (LGO), a biobased chiral compound was obtained through the flash pyrolysis of acidified cellulose, a safer and more sustainable chemo-enzymic synthetic pathway involving lipase-mediated Baeyer-Villiger oxidation, palladium-catalyzed hydrogenation, tosylation and treatment with sodium ethoxide/methoxide as key steps was proposed. This route afforded Et and Me (S)-3-(oxiran-2-yl)propanoates in 57% overall yield, resp. To demonstrate the potentiality of this new synthetic pathway from LGO, the synthesis of high value-added (S)-dairy lactone was undertaken from these epoxides and provided the target in 37% overall yield from LGO.

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Reference:
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

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 Synthesis of CMI-977, a Potent 5-Lipoxygenase Inhibitor, published in 1999-02-28, which mentions a compound: 32780-06-6, Name is (S)-5-(Hydroxymethyl)dihydrofuran-2(3H)-one, Molecular C5H8O3, Related Products of 32780-06-6.

5-Lipoxygenase inhibitor (-)-CMI-977 I is prepared as the (2S,5S) enantiomer in nine steps from (S)-glutamic acid, 4-fluorophenol, 3-butynol, and N,O-bis(phenoxycarbonyl)hydroxylamine, and in seven steps from (S)-(+)-hydroxymethyl-γ-butyrolactone.

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Reference:
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

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: 32780-06-6, is researched, Molecular C5H8O3, about Calculations of Cotton effects in the vacuum UV region for chiral γ-lactones: correlation with the absolute stereochemistry, the main research direction is Cotton effect lactone absolute configuration; configuration absolute lactone Cotton effect; CD lactone; ORD lactone.Application In Synthesis of (S)-5-(Hydroxymethyl)dihydrofuran-2(3H)-one.

A graphic method of Drude equations was applied to calculate the Cotton effects below 180 nm region for various types of α- and/or γ-substituted γ-lactones, e.g., I (R1 = H, NH2, NH3Cl; R2 = H, OH; R3 = H, Me) and II (R = H, Br, etc.). The Cotton effects at ∼170 nm were found to reflect the stereochem. at C-2 (neg. for β and pos. for α) and C-4 (pos. for β and neg. for α) as well as the ring conformation (pos. for E3 and neg. for 3E). The rotational contributions at 589 nm were suggested to be the origin of Hudson’s lactone rule.

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Reference:
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

Quality Control of 5,6-Dihydro-2H-pyran-2-one. Aromatic compounds can be divided into two categories: single heterocycles and fused heterocycles. Compound: 5,6-Dihydro-2H-pyran-2-one, is researched, Molecular C5H6O2, CAS is 3393-45-1, about Catalytic asymmetric borylative aldol reaction of 5,6-dihydro-2H-pyran-2-one and ketones. Author is Zhang, Qi; Jia, Xueshun; Yin, Liang.

A copper(I)-catalyzed asym. borylative aldol reaction of 5,6-dihydro-2H-pyran-2-one and simple ketones (including aromatic ketones and an aliphatic ketone) was disclosed, which afforded a series of chiral diols after an oxidative work-up in moderate yields with moderate to high diastereoselectivity and excellent enantioselectivity [e.g., 2-acetonaphthone + 5,6-dihydro-2H-pyran-2-one + (BPin)2 → I (63%, >20:1 dr, 99% ee) in presence of Cu(MeCN)4PF6, (R,Rp)-TANIAPHOS, NaBARF, iPrOH as proton source and NaOBu-t as base in THF at -50°]. The lactone moiety was easily opened with methanol to generate a chiral triol in moderate yield.

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Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

Synthetic Route of C5H6O2. 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: 5,6-Dihydro-2H-pyran-2-one, is researched, Molecular C5H6O2, CAS is 3393-45-1, about Alkylidene Meldrum’s Acids as Platforms for the Vinylogous Synthesis of Dihydropyranones. Author is Wittmann, Stephane; Martzel, Thomas; Pham Truong, Cong Thanh; Toffano, Martial; Oudeyer, Sylvain; Guillot, Regis; Bournaud, Chloee; Gandon, Vincent; Briere, Jean-Francois; Vo-Thanh, Giang.

Upon Broensted base organocatalysis, ketone-derived alkylidene Meldrum’s acids proved to be competent vinylogous platforms able to undergo a formal (4+2) cycloaddition reaction with dihydro-2,3-furandione, providing an unprecedented route to 3,6-dihydropyran-2-ones as spiro[4.5]decane derivatives, e.g., I, with up to 98% ee thanks to the com. available Takemoto catalyst. Preliminary investigation showed that this reaction could be extended to other activated ketones, establishing these alkylidene Meldrum’s acids as a novel C4-synthon in the vinylogous series.

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Reference:
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI