Tag: M.W=300-350

Kubota, L. T. published the artcileElectrochemical study of flavins, phenazines, phenoxazines, and phenothiazines immobilized on zirconium phosphate, COA of Formula: C18H15N3O3, the publication is Electroanalysis (1999), 11(10-11), 719-728, database is CAplus.

Adsorption of a number of flavins, phenazines, phenoxazines, and phenothiazines on zirconium phosphate (ZP) was carried out in aqueous solution The adsorbed organic dyes on ZP were used to prepare modified C paste electrodes. The electrochem. properties of the immobilized dyes were investigated and also their possible use to electrocatalytically oxidize NADH. The formal potential (E⁰‘) of most of the adsorbed flavins, phenoxazines, and phenothiazines shifted markedly towards more pos. potentials compared with their values in solution The pH of the contacting solution did not affect their E⁰‘-values between pH 1-9. The phenazines did neither present good electrochem. response nor electrocatalytic activity for NADH oxidation and their E⁰‘-values remained pH dependent. In contrast, adsorbed flavins, phenoxazines, and phenothiazines presented good electron transfer rates between the electrode and the adsorbed mol. dye at pH 7.0.

Electroanalysis 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, COA of Formula: C18H15N3O3.

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

Joshi, Raman Kumar published the artcileRadiosynthesis challenges of ¹¹C and ¹⁸F-labeled radiotracers in the FX2C/N tracerlab and their validation through PET-MR imaging, Formula: C17H37NO3, the publication is Applied Radiation and Isotopes (2021), 109486, database is CAplus and MEDLINE.

Glucose is the renowned source of the energy for the cancer growth, that¡äs the reason for [¹⁸F]FDG success and make it widely used radiotracer. Though [¹⁸F]FDG has its own inherent limitations therefore many tracers have been developed to target specific receptors, and other metabolic routes. We have used FX2C and FX2N Tracerlab modules for the synthesis of the [¹¹C]methionine, [¹⁸F]choline and [¹⁸F]fluorodopa via nucleophilic pathway in FX2C/N module. [¹¹C]methionine was standardized in FX2C module using two different precursors, and purified using C18 cartridge based technique. [¹⁸F]methylcholine was synthesized using dimethylaminoethanol precursor and purified using cartridge-based method. [¹⁸F]fluorodopa was synthesized using nucleophilic precursor and purified using in-built preparative HPLC on FX2N module. All radioactive intermediates and chem. impurities were evaluated by anal. HPLC. The radiochem. purity of D and L-[¹¹C]methionine were 4.6 ¡À 3.2% and 95.4 ¡À 3.6% while other chem. impurities were less than prescribed limits with yield of 20 ¡À 5%. [¹⁸F]fluoromethylcholine was prepared with high radiochem. purity of 97.3 ¡À 2.6% with yield of 8 ¡À 3%. [¹⁸F]fluorodopa was synthesized with high radiochem. purity of 95.8 ¡À 1.4% with 15 ¡À 3% yield. The adaptation of [¹⁸F]fluorodopa synthesis to FX2N module via designing synthesis sequence and purified through online HPLC has provided high radiochem. purity. PET-MR imaging was done using these tracers which have validated the synthesis and their availability for future clin. applications.

Applied Radiation and Isotopes 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, Formula: C17H37NO3.

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

Roy, Monika A. published the artcileNrf2a dependent and independent effects of early life exposure to 3,3¡ä-dichlorobiphenyl (PCB-11) in zebrafish (Danio rerio), Application of Docosahexaenoic Acid, the publication is Aquatic Toxicology (2022), 106219, database is CAplus and MEDLINE.

The environmental pollutant 3,3¡ä-dichlorobiphenyl (PCB-11) is a lower-chlorinated polychlorinated biphenyl (PCB) congener present in air and water samples. Both PCB-11 and its metabolite, 4-PCB-11-Sulfate, are detected in humans, including in pregnant women. Previous research in zebrafish (Danio rerio) has shown that 0.2 ¦ÌM exposures to 4-PCB-11-Sulfate starting at 1 day post fertilization (dpf) increase hepatic neutral lipid accumulation in larvae at 15 dpf. Here, we explored whether nuclear factor erythroid 2-related factor 2 (Nrf2), known as the master-regulator of the adaptive response to oxidative stress, contributes to metabolic impacts of 4-PCB-11-Sulfate. For this work, embryos were collected from homozygous wildtype or Nrf2a mutant adult zebrafish that also express GFP in pancreatic ¦Â-cells, rendering Tg(ins:GFP;nrf2afh318+/+) and Tg(ins:GFP;nrf2afh318-/-) lines. Exposures were conducted from 1-15 dpf to either 0.05% DMSO or DMSO-matched 0.2 ¦ÌM 4-PCB-11-Sulfate, and at 15 dpf subsets of larvae were imaged for overall morphol., primary pancreatic islet area, and collected for fatty acid profiling and RNAseq. At 15 dpf, independent of genotype, fish exposed to 4-PCB-11-Sulfate survived significantly more at 80-85% compared to 65-73% survival for unexposed fish, and had primary pancreatic islets 8% larger compared to unexposed fish. Fish growth at 15 dpf was dependent on genotype, with Nrf2a mutant fish a significant 3-5% shorter than wildtype fish, and an interaction effect was observed where Nrf2a mutant fish exposed to 4-PCB-11-Sulfate experienced a significant 29% decrease in the omega-3 fatty acid DHA compared to unexposed mutant fish. RNAseq revealed 308 differentially expressed genes, most of which were dependent on genotype. These findings suggest that Nrf2a plays an important role in growth as well as for DHA production in the presence of 4-PCB-11-Sulfate. Further research would be beneficial to understand the importance of Nrf2a throughout the lifecourse, especially in the context of toxicant exposures.

Aquatic Toxicology published new progress about 6217-54-5. 6217-54-5 belongs to catalysis-chemistry, auxiliary class Alkenyl,Carboxylic acid,Aliphatic hydrocarbon chain,Metabolic Enzyme,RAR/RXR,Natural product, name is Docosahexaenoic Acid, and the molecular formula is C22H32O2, Application of Docosahexaenoic Acid.

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

Bhatt, Vasishta D. published the artcileIon exchange synthesis and thermal characteristics of some [N⁺₄₄₄₄] based ionic liquids, Related Products of catalysis-chemistry, the publication is Thermochimica Acta (2013), 23-29, database is CAplus.

Eight salts, derived from tetrabutylammonium cation [N⁺₄₄₄₄] and inorganic anions like BF₄^–, NO₃^–, NO₂^–, SCN^–, BrO₃^–, IO₃^–, PF₆^– and HCO₃^– were synthesized using the ion exchange method. These ionic liquids (ILs) were characterized using thermogravimetry, differential scanning calorimetry and IR spectroscopy. Thermophys. properties such as d., volume expansion, heat of fusion, heat of solid-solid transitions, sp. heat capacity and thermal energy storage capacity were determined The total of heat of solid-solid transitions observed below the m.ps. exceeded the heat of fusion in some cases. The thermal conductivity of the samples was determined both in solid and liquid phases. High values of thermal energy storage capacity and handsome liquid phase thermal conductivities made many of the ionic liquids under investigation were recommended as Thermal Energy Storage Devices (TESDs) as well as heat transfer fluids.

Thermochimica Acta 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, Related Products of catalysis-chemistry.

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

Silavwe, Ned D. published the artcileReduction of carbon dioxide and other substrates using photochemical reactions of the decacarbonylditungstate(2-) complex, Safety of Tetrabutylammonium hydrogencarbonate, the publication is Inorganic Chemistry (1989), 28(7), 1231-6, database is CAplus.

The photochem. of W₂(CO)₁₀^2- was studied with the goal of determining if irradiation of this dimer generates a powerful reducing agent, presumably a 19-electron species. In general, the photochem. of W₂(CO)₁₀^2- is comparable to that of other metal-metal-bonded carbony dimers. Irradiation into the low-energy tail of the d¦Ð ¡ú ¦Ò^* electronic transition of W₂(CO)₁₀^2- led to W-W bond homolysis. The resulting 17-electron W(CO)₅^– radicals could be trapped with suitable ligands such as 4-cyanopyridine to give 19-electron adducts [adducts that form when 17-electron radicals react with 2-electron ligands]. Evidence is presented that PPh₃ and PBu₃ also react with photogenerated W(CO)₅^– to form adducts: W(CO)₅^– + PR₃ ¡ú W(CO)₅PR₃^–. These adducts are powerful reducing agents, and they were used to reduce CO₂ to formate and CO. The only organometallic product formed in the reaction was W(CO)₅PPh₃, the oxidized form of the 19-electron complex. In a similar manner, Mn₂(CO)₁₀ was reduced to Mn(CO)₅^–, Cp₂Co⁺ to Cp₂Co, benzophenone to the radical anion, and methylviologen (MV²⁺) to MV⁺. Alternative reduction mechanisms involving the W(CO)₅^– radical, W(CO)₅^2-, or HW₂(CO)₁₀^– as reductants were shown not to be operating. Nineteen-electron complexes generated by irradiation of Cp₂Mo₂(CO)₆ proved incapable of reducing CO₂.

Inorganic Chemistry 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 C15H12O6, Safety of Tetrabutylammonium hydrogencarbonate.

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

Huang, Jiarong published the artcileA stretchable elastomer with recyclability and shape memory assisted self-healing capabilities based on dynamic disulfide bonds, Name: 2,2′-Dithiodibenzoic acid, the publication is Polymer (2022), 124569, database is CAplus.

Shape memory assisted self-healing (SMASH) material is a kind of smart materials that can automatically close local microscopic cracks and heal those cracks by bonding the damaged surfaces. Here, the authors designed a SMASH elastomer via introducing polylactide (PLA) and disulfide bonds into the epoxidized natural rubber (ENR). PLA chains were interspersed in ENR network as control switch to fix or release the temporary shape, providing ENR with enhanced mech. strength and shape memory properties. After achieving the phys. contact of crack surfaces by intrinsic shape memory, the exchange reaction of disulfide bonds healed the damaged area at elevated temperature Meanwhile, the dynamic feature of disulfide bonds endowed ENR with recyclability, which could be further promoted by the thermoplasticity of PLA phase. Addnl., the authors also verified the feasibility of this strategy in designing PLA/ENR thermoplastic vulcanizate with SMASH behavior via dynamic vulcanization, expanding the research scope of self-healing elastomers and dynamic vulcanization.

Polymer published new progress about 119-80-2. 119-80-2 belongs to catalysis-chemistry, auxiliary class sulfides,Carboxylic acid,Benzene, name is 2,2′-Dithiodibenzoic acid, and the molecular formula is C14H10O4S2, Name: 2,2′-Dithiodibenzoic acid.

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

Di Mauro, Chiara published the artcileChemical and mechanical reprocessed resins and bio-composites based on five epoxidized vegetable oils thermosets reinforced with flax fibers or PLA woven, Application of 2,2′-Dithiodibenzoic acid, the publication is Composites Science and Technology (2021), 108678, database is CAplus.

Bio-epoxy resins based on five epoxidized vegetable oils were formulated with an aromatic disulfide crosslinker with diacid functionality, 2,2′-dithiodibenzoic acid (DTBA), to obtain recyclable epoxy thermosets. Flax fibers (FF) and PLA woven were used as bio-based reinforcements for these matrixes. Different percentages of reinforcement were tested and the effect of the natural fibers on the matrix’s crosslinking reaction was studied by DSC anal. Then, the obtained materials were analyzed by differential scanning calorimetry, thermogravimetric anal., dynamic mech. anal., water absorption and SEM. The reinforcements improved the thermal and mech. properties of the neat resins, with tan ¦Ä values varying from 91 to 148¡ãC showing a good compatibility matrix-FF but a reduced one in case of matrix-PLA woven. The dynamic nature of the networks crosslinking allowed the chem. and mech. recycling of both resins and bio-composites. Moreover, the obtained results show the possibility to recuperate the natural FF filler for the preparation of second-life generation bio-composites.

Composites Science and Technology published new progress about 119-80-2. 119-80-2 belongs to catalysis-chemistry, auxiliary class sulfides,Carboxylic acid,Benzene, name is 2,2′-Dithiodibenzoic acid, and the molecular formula is C14H10O4S2, Application of 2,2′-Dithiodibenzoic acid.

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

Di Mauro, Chiara published the artcileBuilding thermally and chemically reversible covalent bonds in vegetable oil based epoxy thermosets. Influence of epoxy-hardener ratio in promoting recyclability, Related Products of catalysis-chemistry, the publication is Materials Advances (2020), 1(6), 1788-1798, database is CAplus.

Thermoset polymers with permanently crosslinked networks formed via thermally reversible covalent bonds have outstanding self-healing and adaptable properties, combined with very good mech. properties and solvent resistance. This work reports for the first time the synthesis and characterization of such materials, derived from epoxidized linseed or soybean oils crosslinked with different amounts of 2,2′-dithiodibenzoic acid. The epoxy/hardener ratio was studied as a key parameter influencing the overall process and moreover the network recyclability. The synthesized thermosets showed excellent chem. recycling and mech. reprocessing abilities. The produced networks were chem. recycled, then the recuperated reprocessed material was found to show no or a small decrease in mech. properties. These biobased thermosets provide opportunities for the circular use of thermosets.

Materials Advances published new progress about 119-80-2. 119-80-2 belongs to catalysis-chemistry, auxiliary class sulfides,Carboxylic acid,Benzene, name is 2,2′-Dithiodibenzoic acid, and the molecular formula is C14H10O4S2, Related Products of catalysis-chemistry.

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

Paenurk, Eno published the artcileSimple and efficient visualization of aromaticity: bond currents calculated from NICS values, Synthetic Route of 191-07-1, the publication is Physical Chemistry Chemical Physics (2022), 24(15), 8631-8644, database is CAplus and MEDLINE.

Aromaticity is a fundamental concept in chem., underpinning the properties and reactivity of many organic compounds and materials. The ability to easily and accurately discern aromatic behavior is key to leveraging it as a design element, yet most aromaticity metrics struggle to combine accurate quant. evaluation, intuitive interpretability, and user-friendliness. We introduce a new method, NICS2BC, which uses simple and inexpensive NICS calculations to generate information-rich and easily-interpreted bond-current graphs. We test the quant. and qual. characterizations afforded by NICS2BC for a selection of mols. of varying structural and electronic complexity, to demonstrate its accuracy and ease of anal. Moreover, we show that NICS2BC successfully identifies ring-current patterns in mols. known to be difficult cases to interpret with NICS and enables deeper understanding of local aromaticity trends, demonstrating that our method adds addnl. insight.

Physical Chemistry Chemical Physics 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, Synthetic Route of 191-07-1.

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

Moeini, Nazanin published the artcileA synthesis of sulfoxides and disulfides under classical and ultrasonic conditions in presence of recoverable inorganic-organic hybrid magnetism nanocatalysts Fe₃O₄@Tryptophan-M (M: Cu, Co and Fe), Recommanded Product: 2,2′-Dithiodibenzoic acid, the publication is Polyhedron (2019), 278-286, database is CAplus.

Three inorganic-organic hybrid magnetic nanocatalysts have been reported as new catalysts for the synthesis of sulfoxides and disulfides. Also, the effect of ultrasound irradiation on the synthesis of sulfoxides and disulfides was checked. The time of reaction was reduced and the yield was improved in the ultrasonic method compared with the conventional method. Magnetic nanoparticles were used for several times without any significant change in activity. Easy synthesis, high catalytic activity, mild reaction conditions, eco-friendliness, ease of separation of the catalysts and good reusability are their advantages.

Polyhedron published new progress about 119-80-2. 119-80-2 belongs to catalysis-chemistry, auxiliary class sulfides,Carboxylic acid,Benzene, name is 2,2′-Dithiodibenzoic acid, and the molecular formula is C14H10O4S2, Recommanded Product: 2,2′-Dithiodibenzoic acid.

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