Catalysis-chemistry

Abdulradha, Shaima K. published the artcileStudy of the Interaction Between Reduced Graphene Oxide and NO₂ Gas Molecules via Density Functional Theory (DFT), COA of Formula: C24H12, the publication is International Journal of Nanoscience (2022), 21(2), 2250009, database is CAplus.

Electronic properties such as d. of state, energy gap, HOMO (the HOMO) level, LUMO (the LUMO) level and d. of bonds, as well as spectroscopic properties like IR (IR), Raman scattering, force constant, and reduced masses for coronene C₂₄, reduced graphene oxide (rGO) C₂₄O₅ and interaction between C₂₄O₅ and NO₂ gas mols. were investigated. D. functional theory (DFT) with the exchange hybrid function B3LYP with 6-311G** basis sets through the Gaussian 09W software program was used to do these calculations Gaussian view 05 was employed as a supplementary software to investigate the geometrical structure of C₂₄, C₂₄O₅ and the interaction of C₂₄O₅ with NO₂ gas mol. It shows the energy gap of coronene C₂₄ 3.5eV because the effect of quantum confinement and the Coulomb interaction geometry greatly influence the quasi-particle band gap and C₂₄O_x where x = 1-7 was from 0.89eV to 1.6862eV a function of number of oxygen atoms and compared with the experiment value of graphene oxide which was between 1eV and 2.2eV. The spectroscopic properties were compared with the experiment value of graphene, graphene oxide and NO₂ longitudinal optical (LO) modes of 1585, 1582 and 1600cm^-1, resp. The transition state of the interaction of rGO with nitrogen dioxide and Gibbs energy, enthalpy, activation entropy and reaction at various temperatures between 25¡ã C and 100¡ã C were calculated The activation energy of C₂₄O₅ with nitrogen dioxide decreases with increasing temperature

International Journal of Nanoscience published new progress about 191-07-1. 191-07-1 belongs to catalysis-chemistry, auxiliary class Electronic Materials, name is Coronene, and the molecular formula is C24H12, COA of Formula: C24H12.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Banik, Soma published the artcileModified aggregation pattern of cresyl violet acetate adsorbed on nano clay mineral layers in Langmuir Blodgett film, Formula: C18H15N3O3, the publication is Journal of Photochemistry and Photobiology, A: Chemistry (2018), 570-580, database is CAplus.

Present work investigated the modified aggregation behavior of a cationic oxazine dye, Cresyl violet acetate (CVA) in presence of Laponite nano clay mineral layers in aqueousclay mineral dispersion as well as in ultra thin organo-clay hybrid Langmuir Blodgett (LB) films. The presence of non-fluorescent H-dimeric sites in aqueoussolutionof CVA even at very low concentrationdiminishes its fluorescence intensity and CVA ceases to emit any fluorescence in solid state and in the ultrathin films due to the abundance of H-dimeric sites. Incorporation of clay in aqueoussolutiondrastically modified the absorption spectrum of CVA. Organo-clay hybrid film of CVA, fabricated at higher clay concentration, showed intense J-aggregated band due to the formation of J-aggregated species. UV-vis absorption and fluorescence spectroscopy as well as in-situ Brewster angle microscopic (BAM) studies were employed in this investigation.

Journal of Photochemistry and Photobiology, A: Chemistry published new progress about 10510-54-0. 10510-54-0 belongs to catalysis-chemistry, auxiliary class Other Aromatic Heterocyclic,Salt,Amine,Inhibitor,Inhibitor, name is 5,9-Diaminobenzo[a]phenoxazin-7-ium acetate, and the molecular formula is C18H15N3O3, Formula: C18H15N3O3.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Kim, Sang Wook published the artcileTwo years of experience with the [¹⁸F]FDG production module, Recommanded Product: Tetrabutylammonium hydrogencarbonate, the publication is Nuclear Instruments & Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms (2007), 261(1-2), 816-818, database is CAplus.

Chem. module for a conventional [¹⁸F]FDG production by Bu₄N bicarbonate (TBA) and an acidic hydrolysis was manufactured and evaluated. In this experiment, 75 mM (pH 7.5-7.8) of TBA solution and a ?2-Ci order of [¹⁸F]-fluoride were used for the evaluation. The com. acidic purification cartridge was purchased from GE or UKE. The operation system (OS) was programmed with Lab-View which was selected because of its easy customization of the OS. Small sized solenoid valves (Burkert; type 6124) were selected to reduce the module dimensions (W 350 ¡Á D 270 ¡Á H 250). The total time for the synthesis of [¹⁸F]FDG was 30 ¡À 3 min. The production yield of [¹⁸F]FDG was 60 ¡À 2% on an average at EOS, with the decay uncorrected. The traditional chem. module can provide a good [¹⁸F]FDG production yield by optimizing the operational conditions. The radiochem. purity, radionuclidic purity, acidity, residual solvent, osmolality and endotoxin assess the quality of [¹⁸F]FDG. The examined contents for the quality control of [¹⁸F]FDG are suitable for a clin. application.

Nuclear Instruments & Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms published new progress about 17351-62-1. 17351-62-1 belongs to catalysis-chemistry, auxiliary class Salt,Amine, name is Tetrabutylammonium hydrogencarbonate, and the molecular formula is C17H37NO3, Recommanded Product: Tetrabutylammonium hydrogencarbonate.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

May, E. M. published the artcileA normal-phase high-performance liquid-chromatographic assay for aziridine residue in trientine dihydrochloride, Recommanded Product: N1,N1′-(Ethane-1,2-diyl)bis(ethane-1,2-diamine) dihydrochloride, the publication is Journal of Pharmaceutical and Biomedical Analysis (1987), 5(1), 65-70, database is CAplus and MEDLINE.

The aziridine??[151-56-4] residue in trientine (I) [112-24-3] (com. product), purified compound, and in I-HCl [38260-01-4] was determined by an indirect HPLC method on a LiChrosorb column (5-¦Ìm) with CH₂Cl₂-iso-PrOH (98.5:1.5) and UV detector at 260 and 410 nm. The compound was treated with Folin’s reagent in pH 11.9 phosphate buffer and the complex was chromatographed. The detection limit was 0.05 ppm. Seven com. samples of trientine were examined for the presence of aziridine by the above method, and no aziridine was detected in any of the samples. The method is applicable for basic drugs in general.

Journal of Pharmaceutical and Biomedical Analysis published new progress about 38260-01-4. 38260-01-4 belongs to catalysis-chemistry, auxiliary class Chelating Agents, name is N1,N1′-(Ethane-1,2-diyl)bis(ethane-1,2-diamine) dihydrochloride, and the molecular formula is C6H20Cl2N4, Recommanded Product: N1,N1′-(Ethane-1,2-diyl)bis(ethane-1,2-diamine) dihydrochloride.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Kraml, Michael published the artcileAgents affecting lipid metabolism. VIII. N,N’-Dibenzylethylenediamine, the key to a novel class of cholesterol biosynthesis inhibitors, Recommanded Product: Propane-1,3-diamine dihydrochloride, the publication is Journal of Medicinal Chemistry (1964), 7(4), 500-3, database is CAplus and MEDLINE.

cf. CA 58, 13786h; 60, 11242c. A number of mevalonic acid analogs and their N,N’-dibenzylethylenediamine (I) salts were tested for their effect on the incorporation of mevalonate-2-¹⁴C into cholesterol by rat liver homogenates. In contrast to the mevalonic acid analogs, their I salts exhibited an inhibitory property which was found to reside in I itself. The site of action of I is at the level of the conversion of 7-dehydrocholesterol to cholesterol. I was moderately effective in lowering serum sterols in hypercholesterolemic rats. Mol. modifications of I have resulted in compounds of increased potency, showing activity in vitro at a concentration of 10^-8M.

Journal of Medicinal Chemistry published new progress about 10517-44-9. 10517-44-9 belongs to catalysis-chemistry, auxiliary class Salt,Amine,Aliphatic hydrocarbon chain, name is Propane-1,3-diamine dihydrochloride, and the molecular formula is C3H12Cl2N2, Recommanded Product: Propane-1,3-diamine dihydrochloride.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Christiaens, Mien published the artcileStereoselective and Modular Assembly Method for Heterocycle-Fused Daucane Sesquiterpenoids, Formula: C15H15OP, the publication is Chemistry – A European Journal (2018), 24(52), 13783-13787, database is CAplus and MEDLINE.

A stereoselective synthetic method is reported for the mol. framework found in common daucane and isodaucane sesquiterpenoid natural products. The synthetic method constitutes a scalable, modular, and also asym. access to a complex natural product scaffold, wherein the substitution pattern and the stereochem. can be adjusted simply by choosing different starting materials. The method allows the rapid introduction of diverse heterocyclic substructures such as (benzo)furans, (benzo)thiophenes, dithiins, thiazoles, and indoles, which actually also facilitate and direct the key intramol. annulation step.

Chemistry – A European Journal published new progress about 4141-48-4. 4141-48-4 belongs to catalysis-chemistry, auxiliary class Aryl phosphine ligand,Mono-phosphine Ligands, name is Allyldiphenylphosphine oxide, and the molecular formula is C15H15OP, Formula: C15H15OP.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Glinel, K. published the artcileComparison of the associating behavior between neutral and anionic alkylperfluorinated pullulan derivatives, Application In Synthesis of 30670-30-5, the publication is Polymer (1999), 40(25), 7071-7081, database is CAplus.

New hydrophobically modified pullulans were synthesized in two ways: (i) neutral derivatives (HMPFs) obtained by direct esterification of pullulan with a perfluoroalkyl carboxylic acid (C₈F₁₇CH₂CH₂COOH), and (ii) ionic derivatives (HMCMPs) obtained by amidation of carboxymethylpullulan with two perfluoroalkylamines (C₇F₁₅CH₂NH₂ and C₈F₁₇CH₂CH₂NH₂). The molar hydrophobe contents ranged from 1.1 to 4.8% with respect to the anhydroglucose units. Associative properties in aqueous solutions were studied by rheol. and size-exclusion chromatog./light-scattering measurements. In dilute solution, the polymers form intermol. aggregates with a more compact conformation than that of precursors. In semi-dilute solution, the ionic derivatives are more viscosifying than neutral because of their better solubility This effect is significant as the alkylperfluorinated chain length increases.

Polymer published new progress about 30670-30-5. 30670-30-5 belongs to catalysis-chemistry, auxiliary class Polyfluoroalkanes, name is 3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,10-Heptadecafluorodecan-1-amine, and the molecular formula is C10H6F17N, Application In Synthesis of 30670-30-5.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Li, Yong published the artcileMicrowave-assisted efficient and facile synthesis of tetramic acid derivatives via a one-pot post-Ugi cascade reaction, Category: catalysis-chemistry, the publication is Beilstein Journal of Organic Chemistry (2020), 663-669, database is CAplus and MEDLINE.

A facile microwave-assisted method for the synthesis of tetramic acid derivatives I (R¹ = Ph, Bn, 4-MeOC₆H₄, etc.; R² = 3-F, 4-NO₂, 3,4-(OMe)₂, etc.; R³ = Ph, Bn, c-hexyl, 2,6-(Me)₂C₆H₃) has been developed through an Ugi/Dieckmann cyclization strategy with DBU. This two-step one-pot procedure afforded the targeted tetramic acid analogs in good yields. With com. available Ugi starting materials, microwave irradiation, a simple operation, excellent yields, and a broad scope, this reaction has the potential to produce a large number of tetramic acid analogs, which cannot be easily accessed by the classic synthetic methods.

Beilstein Journal of Organic Chemistry published new progress about 104-03-0. 104-03-0 belongs to catalysis-chemistry, auxiliary class Nitro Compound,Carboxylic acid,Benzene, name is 4-Nitrophenylacetic acid, and the molecular formula is C8H7NO4, Category: catalysis-chemistry.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Wu, Xiaofan published the artcileAsymmetric Synthesis of a Key Dextromethorphan Intermediate and Its Analogues Enabled by a New Cyclohexylamine Oxidase: Enzyme Discovery, Reaction Development, and Mechanistic Insight, Recommanded Product: 4-Nitrophenylacetic acid, the publication is Journal of Organic Chemistry (2020), 85(8), 5598-5614, database is CAplus and MEDLINE.

(S)-1-(4-Methoxybenzyl)-1,2,3,4,5,6,7,8-octahydroisoquinoline [(S)-1-(4-methoxybenzyl)-OHIQ, (S)-1a] is a key synthetic intermediate in the industrial production of dextromethorphan, one of the most widely used over-the-counter antitussives. We report here that a new cyclohexylamine oxidase discovered by genome mining, named CHAO_CCH12-C2, was able to completely deracemize 100 mM 1a under Turner’s deracemization conditions to afford (S)-1a in 80% isolated yield and 99% ee at a semipreparative scale (0.4 mmol). When this biocatalytic reaction was scaled up to a gram scale (5.8 mmol), without reaction optimization (S)-1a was still isolated in 67% yield and 96% ee. The relatively higher k_cat determined for CHAO_CCH12-C2 was rationalized as one major factor rendering this enzyme capable of oxidizing 1a effectively at elevated substrate concentrations Protein sequence alignment, anal. of our co-crystal structure of CHAO_CCH12-C2 complexed with the product 1-(4-methoxybenzyl)-3,4,5,6,7,8-hexahydroisoquinoline [1-(4-methoxybenzyl)-HHIQ, 2a], and the structure-guided mutagenesis study together indicated L295 is one of the critical residues for this efficient enzymic oxidation process and supported the presence of two cavities as well as a catalytically important “aromatic cage” formed by F342, Y433, and FAD. The synthetic applicability of CHAO_CCH12-C2 was further underscored by the stereoselective synthesis of various enantioenriched 1-benzyl-OHIQ derivatives of potential pharmaceutical importance at a semipreparative scale.

Journal of Organic Chemistry published new progress about 104-03-0. 104-03-0 belongs to catalysis-chemistry, auxiliary class Nitro Compound,Carboxylic acid,Benzene, name is 4-Nitrophenylacetic acid, and the molecular formula is C5H12BrO3P, Recommanded Product: 4-Nitrophenylacetic acid.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Xiang, Silin published the artcileArginine regulates inflammation response-induced by Fowl Adenovirus serotype 4 via JAK2/STAT3 pathway, Product Details of C5H11NO2S, the publication is BMC Veterinary Research (2022), 18(1), 189, database is CAplus and MEDLINE.

Fowl Adenovirus serotype 4 (FAdV-4) infection causes severe inflammatory response leading to hepatitis-hydropericardium syndrome (HHS) in poultry. As an essential functional amino acid of poultry, arginine plays a critical role in anti-inflammatory and anti-oxidative stress. In this study, the differential expression genes (DEGs) were screened by transcriptomic techniques, and the DEGs in gene networks of inflammatory response-induced by FAdV-4 in broiler’s liver were analyzed by Kyoto encyclopedia of genes and genomes (KEGG) enrichment. The results showed that the cytokines pathway and JAK/STAT pathway were significantly enriched, in which the DEGs levels of IL-6, IL-1¦Â, IFN-¦Á, JAK and STAT were significantly up-regulated after FAdV-4 infection. It was further verified with real-time fluorescence quant. polymerase chain reaction (Real-time qPCR) and Western blotting (WB) in vitro and in vivo. The findings demonstrated that FAdV-4 induced inflammatory response and activated JAK2/STAT3 pathway. Furthermore, we investigated whether arginine could alleviate the liver inflammation induced by FAdV-4. After treatment with 1.92% arginine level diet to broilers or 300¦Ìg/mL arginine culture medium to LMH cell line with FAdV-4 infection at the same time, we found that the mRNA levels of IL-6, IL-1¦Â, IFN-¦Á and the protein levels of p-JAK2, p-STAT3 were down-regulated, compared with FAdV-4 infection group. Furthermore, we confirmed that the inflammation induced by FAdV-4 was ameliorated by pre-treatment with JAK inhibitor AG490 in LMH cells, and it was further alleviated in LMH cells treatment with AG490 and ARG. These above results provide new insight that arginine protects hepatocytes against inflammation induced by FAdV-4 through JAK2/STAT3 signaling pathway.

BMC Veterinary Research published new progress about 63-68-3. 63-68-3 belongs to catalysis-chemistry, auxiliary class Natural product, name is (S)-2-Amino-4-(methylthio)butanoic acid, and the molecular formula is C13H18N2, Product Details of C5H11NO2S.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia