Catalyst ligands

Zheng, Chao; Wang, Guang-Zu; Shang, Rui published the article 《Catalyst-free decarboxylation and decarboxylative Giese additions of alkyl carboxylates through photoactivation of electron donor-acceptor complex》. Keywords: alkyl carboxylate preparation green chem; acyloxy phthalimide preparation alkene photochem Giese addition; pyridinium salt preparation alkene photochem Giese addition.They researched the compound: 11-Bromoundecanoic acid( cas:2834-05-1 ).Name: 11-Bromoundecanoic acid. 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:2834-05-1) here.

A catalyst-free method to perform decarboxylative conjugated addition and hydrodecarboxylation of aliphatic N-(acyloxy) phthalimides e.g., I (redox active esters, RAEs) through photoactivation of electron-donor-acceptor (EDA) complex with Hantzsch ester (HE) in N,N-dimethylacetamide (DMA) solution was reported. The reactions present a green method to decarboxylatively construct carbon-carbon bond and to perform hydrodecarboxylation with broad substrate scope and functional group tolerance under mild blue light irradiation condition without recourse of popularly used photo-redox catalysts.

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

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 Redox-Responsive Pickering Emulsions Stabilized by Silica Nanoparticles and Ferrocene Surfactants at a Very Low Concentration, published in 2019-10-07, which mentions a compound: 2834-05-1, mainly applied to green pickering emulsion silica nanoparticle ferrocene surfactant stabilized, Recommanded Product: 2834-05-1.

Here, we describe a redox-responsive Pickering emulsion stabilized by silica nanoparticles and a ferrocene surfactant (FcCOC10N) at a concentration as low as 0.01 mM (≈0.005 cmc). The emulsions are stable and resistant to coalescence for more than one month. The ferrocene group in the structure of FcCOC10N can be reversibly switched between its oxidized and reduced forms by redox reactions, which would alter the amphiphilic properties of the surfactant. Consequently, the emulsion can be switched between ′′on′′ (stable) and ′′off′′ (unstable) states through electrochem. reactions without adding addnl. chems. or changing the particle/surfactant concentration Moreover, the Pickering emulsifier composed of the surfactant and the nanoparticles can be recovered and reused after removal of the original oil. It offers a new platform that provides green and sustainable operation for separation and reuse of the emulsifier in potential applications, such as biphasic catalysis and oil transportation. Redox-responsive Pickering emulsions were prepared using silica nanoparticles and a ferrocene surfactant, in which the emulsifier can be recycled and reused without addnl. chems. or expensive equipment.

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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.Xiang, Xian-Ming; Qian, Dong-Jin; Li, Fu-You; Chen, Hai-Tao; Liu, Hong-Guo; Huang, Wei; Feng, Xu-Sheng researched the compound: 4-(p-Tolyl)-2,2:6,2-terpyridine( cas:89972-77-0 ).Synthetic Route of C22H17N3.They published the article 《Fabrication of europium complexes with 4′-(4-methylphenyl)-2,2′:6′,2”-terpyridine and 4,4′-dinonyl-2,2′-dipyridyl at the air-water interface and their emission properties in Langmuir-Blodgett films》 about this compound( cas:89972-77-0 ) in Colloids and Surfaces, A: Physicochemical and Engineering Aspects. Keywords: europium complex methylphenyl terpyridine Langmuir Blodgett film fluorescence; dinonyl dipyridyl europium complex Langmuir Blodgett film fluorescence. We’ll tell you more about this compound (cas:89972-77-0).

Ternary Eu complexes were formed at the air-H2O interface mediated by monolayers of 4,4′-dinonyl-2,2′-dipyridyl (DNDPy) and 4′-(4-methylphenyl)-2,2′:6′,2”-terpyridine (MPTPy). A saturated Eu(TTA)3 (TTA: theonyltrifluoroacetone) aqueous solution was used as subphase, on the surface of which condensed DNDPy and MPTPy monolayers could be stabilized. The DNDPy-/MPTPy-Eu(TTA)3 layers were transferred onto either hydrophobic or hydrophilic substrate surfaces by Langmuir-Blodgett (LB) method. Fluorescence spectra showed several sharp peaks corresponding to Eu3+ emissions from 5D1 → 7F1 (535 nm) and 5D0 → 7F0,1,2,3 (580, 595, 612 and 650 nm). A relative stronger emission from 5D1 → 7F1 to that from 5D0 → 7F2 was recorded for the LB films of DNDPy-Eu(TTA)3 complex. Compared with that in solution, longer fluorescence lifetime was observed for the complexes in the LB films.

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

Wang, Jianhua; Hanan, Garry S. published an article about the compound: 4-(p-Tolyl)-2,2:6,2-terpyridine( cas:89972-77-0,SMILESS:CC1=CC=C(C2=CC(C3=NC=CC=C3)=NC(C4=NC=CC=C4)=C2)C=C1 ).Product Details of 89972-77-0. 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:89972-77-0) through the article.

A facile one-pot synthesis of 4′-aryl-2,2′:6′,2”-terpyridines from aryl aldehydes and 2-acetylpyridine is presented. The synthesis of terpyridines incorporating sterically hindered aryl groups, such as the 9-anthracenyl group, can also be readily synthesized using this method.

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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: 494-52-0, is researched, SMILESS is C1(C=NC=CC=1)[C@@H]1CCCCN1, Molecular C10H14N2Journal, Article, Environmental Monitoring and Assessment called Use of the Chemcatcher passive sampler and time-of-flight mass spectrometry to screen for emerging pollutants in rivers in Gauteng Province of South Africa, Author is Rimayi, Cornelius; Chimuka, Luke; Gravell, Anthony; Fones, Gary R.; Mills, Graham A., the main research direction is water pollution Chemcatcher mass spectra South Africa; Chemcatcher®; Emerging pollutants; Pharmaceuticals and personal care products; Screening; Surface water; Time-of-flight mass spectrometry.Product Details of 494-52-0.

Many rivers in urbanized catchments in South Africa are polluted by raw sewage and effluent to anextent that their ecol. function has been severely impaired. The Hennops and Jukskei Rivers lying in the Hartbeespoort Dam catchment are two of the worst impacted rivers in South Africa and are in need of rehabilitation. Passive sampling (Chemcatcher with a HLB receiving phase) together with high-resolution tandem mass spectrometry-targeted screening was used to provide high sensitivity and selectivity for the identification of a wide range of emerging pollutants in these urban waters. Over 200 compounds, including pesticides, pharmaceuticals and personal care products, drugs of abuse and their metabolites were identified. Many substances (∼180) being detected for the first time in surface water in South Africa. General medicines and psychotropic drugs were the two most frequently detected groups in the catchment. These accounted for 49% of the emerging pollutants found. Of the general medicines, antihypertensive agents, beta-blocking and cardiac drugs were the most abundant (28%) classes detected. The Hennops site, downstream of a dysfunctional wastewater treatment plant, was the most polluted with 123 substances detected. From the compounds detected, peak intensity-based prioritisation was used to identify the five most abundant pollutants, being in the order caffeine > lopinavir > sulfamethoxazole > cotinine > trimethoprim. This work provides the largest available high-quality dataset of emerging pollutants detected in South African urban waters. The data generated in this study provides a solid foundation for subsequent work to further characterize (suspect screening) and quantify (target anal.) these substances.

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

Lombard, Jean; Lepretre, Jean-Claude; Chauvin, Jerome; Collomb, Marie-Noelle; Deronzier, Alain published an article about the compound: 4-(p-Tolyl)-2,2:6,2-terpyridine( cas:89972-77-0,SMILESS:CC1=CC=C(C2=CC(C3=NC=CC=C3)=NC(C4=NC=CC=C4)=C2)C=C1 ).Formula: C22H17N3. 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:89972-77-0) through the article.

A trinuclear [{RuII(bpy)2(bpy-terpy)}2FeII]6+ complex (I) in which a FeII-bis-terpyridine-like center is covalently linked to two RuII-tris-bipyridine-like moieties by a bridging bipyridine-terpyridine ligand has been synthesized and characterized. Its electrochem., photophys. and photochem. properties have been investigated in CH3CN and compared with those of mononuclear model complexes. The cyclic voltammetry of (I) exhibits, in the pos. region, two successive reversible oxidation processes, corresponding to the FeIII/FeII and RuIII/RuII redox couples. These systems are clearly separated (ΔE1/2 = 160 mV), demonstrating the lack of an electronic connection between the two subunits. The two oxidized forms of the complex, [{RuII(bpy)2(bpy-terpy)}2FeIII]7+ and [{RuIII(bpy)2(terpy-bpy)}2FeIII]9+, obtained after two successive exhaustive electrolyzes, are stable. The complex I is poorly luminescent, indicating that the covalent linkage of the RuII-tris-bipyridine to the FeII-bis-terpyridine subunit leads to a strong quenching of the RuII* excited state by energy transfer to the FeII center. Luminescence lifetime experiments show that the process occurs within 6 ns. The nature of the energy transfer process is discussed and an intramol. energy exchange is proposed as a preferable deactivation pathway. Nevertheless this energy transfer can be efficiently quenched by an electron transfer process in the presence of a large excess of the 4-bromophenyldiazonium cation, playing the role of a sacrificial oxidant. Finally complete photoinduced oxidation of (I) has been performed by continuous photolysis experiments in the presence of a large excess of this sacrificial oxidant. The comparison with a mixture of the corresponding mononuclear model complexes has been made.

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Reference:
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, Article, Inorganic Chemistry called Electron Donor-Acceptor Dyads Based on Ruthenium(II) Bipyridine and Terpyridine Complexes Bound to Naphthalenediimide, Author is Johansson, Olof; Borgstroem, Magnus; Lomoth, Reiner; Palmblad, Magnus; Bergquist, Jonas; Hammarstroem, Leif; Sun, Licheng; Kermark, Bjoern, 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, HPLC of Formula: 89972-77-0.

Two series of photosensitizer-electron acceptor complexes were synthesized and fully characterized: ruthenium(II) tris(bipyridine) {[RuII(bpy)2(bpy-X-NDI)], where X = -CH2-, tolylene, or phenylene, bpy is 2,2′-bipyridine, and NDI is naphthalenediimide} and ruthenium(II) bis(terpyridine) {[RuII(Y-tpy)(tpy-X-NDI)], where Y = H or tolyl and X = tolylene or phenylene, and tpy = 2,2′:6′,2”-terpyridine}. The complexes were studied by cyclic and differential pulse voltammetry and by steady state and time-resolved absorption and emission techniques. Rates for forward and backward electron transfer were investigated, following photoexcitation of the ruthenium(II) polypyridine moiety. The terpyridine complexes were only marginally affected by the linked diimide unit, and no electron transfer was observed In the bipyridine complexes the authors achieved efficient charge separation For the complexes containing a Ph link between the ruthenium(II) and diimide moieties, the results suggest a biphasic forward electron-transfer reaction, in which 20% of the charge-separated state was formed via population of the naphthalenediimide triplet state.

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

Li, Yu Yang; Wei, Zhen Hong; Ng, Seik Weng published an article about the compound: 4-(p-Tolyl)-2,2:6,2-terpyridine( cas:89972-77-0,SMILESS:CC1=CC=C(C2=CC(C3=NC=CC=C3)=NC(C4=NC=CC=C4)=C2)C=C1 ).Reference of 4-(p-Tolyl)-2,2:6,2-terpyridine. 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:89972-77-0) through the article.

The title compound, [AgCd(NCS)3(C22H17N3)]n, is a heteroatom ribbon coordination polymer. The central Cd atom is chelated by the 4′-p-tolyl-2,2′:6′,2”-terpyridine ligand and is coordinated by the N atoms of three thiocyanate ions in an octahedral geometry whereas the Ag atom is coordinated by the four S atoms of four thiocyanate ions in a distorted tetrahedral geometry. Of the three thiocyanate ions, one functions in a μ2-bridging mode and two in a μ3-bridging mode. The ribbon coordination polymer propagates along the a-axis.

In addition to the literature in the link below, there is a lot of literature about this compound(4-(p-Tolyl)-2,2:6,2-terpyridine)Reference of 4-(p-Tolyl)-2,2:6,2-terpyridine, illustrating the importance and wide applicability of this compound(89972-77-0).

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

Xu, Lei; Fang, Xiangjun; Wu, Weijie; Chen, Hangjun; Mu, Honglei; Gao, Haiyan published the article 《Effects of high-temperature pre-drying on the quality of air-dried shiitake mushrooms (Lentinula edodes)》. Keywords: Lentinula drying ketone aldehyde; Formaldehyde; High-temperature pre-drying; Shiitake mushroom.They researched the compound: 5,6-Dihydro-2H-pyran-2-one( cas:3393-45-1 ).Synthetic Route of C5H6O2. 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:3393-45-1) here.

We investigated the relationship between the pre-drying temperature and overall quality of dried shiitake mushrooms (Lentinula edodes). Results showed that high-temperature pre-drying significantly increased the rehydration ratio and hardness of dried shiitake mushrooms, but decreased the degree of shrinkage, degree of browning, and formaldehyde content. The levels of enzyme activity were high throughout the pre-drying process and benefitted the formation of flavoured substances. Furthermore, high-temperatures pre-drying also resulted in a higher content of sulfur compounds These results indicated that the pre-drying processing had significant impacts on the overall quality of dried shiitake mushrooms. This may pave the way for increasing the economic value of dried shiitake mushrooms.

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

Synthetic Route of C5H8O3. The fused heterocycle is formed by combining a benzene ring with a single heterocycle, or two or more single heterocycles. Compound: (S)-5-(Hydroxymethyl)dihydrofuran-2(3H)-one, is researched, Molecular C5H8O3, CAS is 32780-06-6, about SmI2 promoted elimination in 5-O-silyl derivatives of D-ribono-1,4-lactone. Author is Zunszain, Patricia A.; Varela, Oscar.

Regioselective silylation of D-ribono-1,4-lactone with 1.1 molar equivalents of tert-butylchlorodiphenylsilane led to the 5-O-silyl derivative (72% yield). The free HO-2 and HO-3 were acetylated or benzoylated to give the products in almost quant. yield. The SmI2-promoted elimination of the 2,3-acyloxy groups was applied to these products. It was proven that the silyloxy group was stable under the reaction conditions, and the butenolide 5-O-tert-butyldiphenylsilyl-2,3-dideoxy-D-glycero-pent-2-eno-1,4-lactone was obtained in over 50% yield. In order to establish its optical purity, the butenolide was hydrogenated and O-desilylated to the (S)-4-hydroxymethyl-1,4-butyrolactone. Alternatively, enantiomerically pure 4-hydroxymethyl-1,4-butyrolactone was prepared from L-glutamic acid. The optical rotations of 4-hydroxymethyl-1,4-butyrolactone from both preparations were very coincident, indicating high optical purity (ee > 05%) for the butenolide.

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