Catalysis-chemistry

Qi, Xin published the artcileBio-based, robust, shape memory, self-healing and recyclable elastomers based on a semi-interpenetrating dynamic network, Related Products of catalysis-chemistry, the publication is Journal of Materials Chemistry A: Materials for Energy and Sustainability (2021), 9(45), 25399-25407, database is CAplus.

Fabricating materials with a combination of high toughness, and self-healing, shape memory and reprocessing properties, especially derived from renewable precursors, remains a challenge. Herein, we demonstrate a simple strategy to prepare a multifunctional elastomer based on a semi-interpenetrating dynamic network (semi-IDN) by using sustainable Eucommia ulmoides gum (EUG) as a raw material. The elastomer possessed high stretchability (~876%) and high tensile strength (~12.1 MPa) as well as good self-healing, solid plasticity and shape memory properties. Moreover, it can not only be reprocessed by hot pressing (tensile strength remains 92% after three times of reprocessing), but can also be recycled by dissolving with little effect on the structure and properties. In addition, a flexible electronic device is prepared by spraying hydroxylated multiwalled carbon nanotubes (MWCNTs-OH) on its surface, which exhibited good self-healing of elec. conductivity after damage. The semi-IDN concept provides a new pathway to prepare reprocessed materials, and the as-prepared elastomers have broad application prospects in new generation green rubber and flexible wearable devices.

Journal of Materials Chemistry A: Materials for Energy and Sustainability 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

Shi, Jiang-Ling published the artcileFe-Promoted Chlorobenzylation of Terminal Alkynes through Benzylic C(sp³)-H Bond Functionalization, SDS of cas: 457-68-1, the publication is Organic Letters (2016), 18(6), 1238-1241, database is CAplus and MEDLINE.

A chlorobenzylation of terminal alkynes through Fe(II)-promoted benzylic C(sp³)-H bond functionalization in the presence of NCS as a chloride source was developed. Compared with previous methods to prepare polysubstituted alkenyl halides, the present procedure provides an efficient alternative with high atom and step economy under mild conditions. The transformation was established to proceed through a single-electron transfer (SET) process with benzyl cations as key intermediates.

Organic Letters published new progress about 457-68-1. 457-68-1 belongs to catalysis-chemistry, auxiliary class Fluoride,Benzene, name is Bis(4-fluorophenyl)methane, and the molecular formula is C15H10O2, SDS of cas: 457-68-1.

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

Zhu, Guizhi published the artcileCombinatorial Screening of DNA Aptamers for Molecular Imaging of HER2 in Cancer, COA of Formula: C17H37NO3, the publication is Bioconjugate Chemistry (2017), 28(4), 1068-1075, database is CAplus and MEDLINE.

HER2, a cell membrane protein overexpressed in many types of cancers, is correlated with poor diagnosis, suboptimal treatment outcome, and low survival rate. Multiple HER2-targeted drugs have been developed for the treatment of HER2-overexpressing tumor, which can in turn down-regulate HER2 expression. It is thus significant to profile HER2 expression for cancer prognosis, patient stratification, and monitoring therapy response. Aptamers, a class of single-stranded DNA/RNA (ssDNA/ssRNA) ligands, are promising for mol. biomarker imaging. Aptamers typically have strong binding affinity, high selectivity, batch-to-batch reproducibility, and low toxicity, and systemically injected aptamers often have high tumor-to-background ratio within a short time. However, current aptamers have been mostly screened in vitro, and these aptamers may lose binding ability in vivo due to conformational change under physiol. environments. Here, a DNA library was combinatorially screened in vitro and in vivo, to select HER2-targeting DNA aptamers, termed Heraptamers, and labeled with ¹⁸F for positron emission tomog. (PET) imaging of HER2 in ovarian cancer. Specifically, using systematic evolution of ligands by exponential enrichment (SELEX), Heraptamer candidates were first selected and validated in vitro using HER2 extracellular domain (ECD) and HER2-pos. SKOV3 cancer cells; then, aptamer candidates were modified with alkyne, radiolabeled with ¹⁸F using azide-functionalized precursors by click chem., and screened in SKOV3-tumor-bearing mice using PET. Two aptamers, Heraptamer1 and Heraptamer2, reached high tumor uptake ratios within as short as 1 h. At 1.5 h post injection, the tumor uptake ratio of these two aptamers was up to 0.5%ID/g (injection dose/g tissue), with tumor-to-muscle ratio of 4.55 ¡À 1.63 in SKOV3 tumor. In contrast, these aptamers have low uptake ratios in control MDA-MB-231 tumors. These preclin. studies showed that Heraptamers are promising for specific HER2 imaging.

Bioconjugate 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 C12H14S, COA of Formula: C17H37NO3.

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

Zhan, Xiao-Yu published the artcileChemoselective Hydrosilylation of the ¦Á,¦Â-Site Double Bond in ¦Á,¦Â- and ¦Á,¦Â,¦Ã,¦Ä-Unsaturated Ketones Catalyzed by Macrosteric Borane Promoted by Hexafluoro-2-propanol, Quality Control of 2051-95-8, the publication is Journal of Organic Chemistry (2020), 85(10), 6578-6592, database is CAplus and MEDLINE.

The B(C₆F₅)₃-catalyzed chemoselective hydrosilylation of ¦Á,¦Â- and ¦Á,¦Â,¦Ã,¦Ä-unsaturated ketones into the corresponding asym. ketones in mild reaction conditions is developed. Nearly 50 substrates including those bearing reducible functional groups such as alkynyl, alkenyl, cyano, and aromatic heterocycles are chemoselectively hydrosilylation in good to excellent yields. Isotope-labeling studies revealed that HFIP also served as hydrogen source in the process.

Journal of Organic Chemistry published new progress about 2051-95-8. 2051-95-8 belongs to catalysis-chemistry, auxiliary class Carboxylic acid,Benzene,Ketone, name is 3-Benzoylpropionicacid, and the molecular formula is C7H8BNO4, Quality Control of 2051-95-8.

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

Chen, Jinqing published the artcileSeparation of lithium and transition metals from the leachate of spent lithium-ion battery by extraction-precipitation with p-tert-butylphenoxy acetic acid, Name: 2-(4-(tert-Butyl)phenoxy)acetic acid, the publication is Hydrometallurgy (2021), 105768, database is CAplus.

Unlike common solvent extraction and chem. precipitation, a novel extraction-precipitation process for the separation of Li and transition metals using p-tertylphenoxyacetic acid (POAA) is developed. Extraction-precipitation method refers to a method in which the extraction-precipitant can quant. extract the metal ions to form solid extracted complex without the requirement of organic solvent or carrier, and the extraction-precipitant can be stripped and recycled. In this study, the extraction-precipitation mechanism and thermodn. parameters between POAA and manganese (Mn), cobalt (Co), nickel (Ni) were analyzed. Subsequently, the equilibrium time and pH value of the separation process were optimized. Finally, the leach solution of LIB having Li, Ni, Co, Mn with concentration of 3.52 g/L, 7.93 g/L, 5.72 g/L, and 14.16 g/L, resp., was studied for the separation at pH 4.5. The results indicate that efficient separation of Li and transition metals was possible by one-step precipitation using 0.2 mol/L POAA solution (degree of saponification = 100%) when the ratio of n_POAA/n_Mn+Co+Ni was 2. The separation factor for the transition metals over lithium (¦¢_CoNiMn/¦¢_Li) reached as high as 133,014. After the transition metal-loaded POAA was stripped with 2 mol/L sulfuric acid, the stripped solution could be used for the production of ternary material precursor, and the regenerated POAA could be recycled for the extraction-precipitation process. The lithium in the solution was recovered in the form of lithium carbonate (Li₂CO₃) with a purity level of 97.7%. This high efficiency and sustainable process based on extraction-precipitation has shown potential application for spent LIB recovery.

Hydrometallurgy published new progress about 1798-04-5. 1798-04-5 belongs to catalysis-chemistry, auxiliary class Carboxylic acid,Benzene,Ether, name is 2-(4-(tert-Butyl)phenoxy)acetic acid, and the molecular formula is C12H16O3, Name: 2-(4-(tert-Butyl)phenoxy)acetic acid.

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

Wang, Han published the artcileSulfoximidations of Benzylic C-H bonds by Photocatalysis, Name: Bis(4-fluorophenyl)methane, the publication is Angewandte Chemie, International Edition (2018), 57(20), 5863-5866, database is CAplus and MEDLINE.

An efficient photocatalytic functionalization of compounds with benzylic C-H bonds by sulfoximidation in visible light is described. The mild reaction conditions allow the use of a broad array of substrates, including diarylmethane, alkyl arenes, arylacetonitrile, 2-arylacetate, and alkynyl aryl methanes. The sulfoximidation process is highly chemoselective and leads to the corresponding sulfoximines, e.g. I, in generally good yields. Mechanistic investigations suggested the intermediacy of sulfoximidoyl radicals.

Angewandte Chemie, International Edition published new progress about 457-68-1. 457-68-1 belongs to catalysis-chemistry, auxiliary class Fluoride,Benzene, name is Bis(4-fluorophenyl)methane, and the molecular formula is C20H17FO4S, Name: Bis(4-fluorophenyl)methane.

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

Yuan, Shuo published the artcilePalladium-Catalyzed Ligand-Free Double Cyclization Reactions for the Synthesis of 3-(1′-Indolyl)-phthalides, Safety of 1-Ethynyl-3-(trifluoromethoxy)benzene, the publication is Organic Letters (2020), 22(3), 814-817, database is CAplus and MEDLINE.

Indole and phthalide are privileged heterocyclic scaffolds in numerous natural products and bioactive mols. The synthesis and biol. evaluation of the compounds combining these two scaffolds have rarely been reported. The first palladium-catalyzed ligand-free double cyclization reactions that enable efficient synthesis of 3-(1′-indolyl)-phthalides, e.g., I, under mild conditions is reported. Notably, only 1.0 mol % of catalyst loading is used, suggesting high efficiency. Late-stage elaborations give highly functionalized analogs.

Organic Letters published new progress about 866683-57-0. 866683-57-0 belongs to catalysis-chemistry, auxiliary class Trifluoromethyl,Fluoride,Alkynyl,Benzene,Ether, name is 1-Ethynyl-3-(trifluoromethoxy)benzene, and the molecular formula is C9H9NO, Safety of 1-Ethynyl-3-(trifluoromethoxy)benzene.

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

Liu, Yan published the artcileThermochemical Sulfate Reduction by Pyrobitumen: Review and Experiments, Product Details of C24H12, the publication is ACS Earth and Space Chemistry (2022), 6(2), 308-321, database is CAplus.

A review. It has remained controversial throughout the last 3 decades whether highly mature solid bitumen derived from petroleum degradation can engage in thermochem. sulfate reduction (TSR)-an organic-inorganic interaction that occurs in sedimentary basins. To study the kinetic characteristics of thermal sulfate reduction by thermogenic pyrobitumen, hydropyrolysis experiments with Mg sulfate (MgSO₄) and a model compound, coronene (C₂₄H₁₂), were performed at 300-500¡ã under controlled laboratory conditions. Detectable amounts of H₂S from the designed simulation system were formed at a threshold temperature of 400¡ã. Thermodynamically, coronene-initiated sulfate reduction is an exothermic process at 100-220¡ã with the reaction heat of 221.0-248.3 kJ/mol hydrocarbon. TSR of coronene is characterized by a 1st-order reaction with an apparent activation energy of 193.0 kJ/mol. Interactions between C₂₄H₁₂ and MgSO₄ are kinetically categorized as a slow TSR system because the high stability of coronene restricts the formation rate of H₂S gas relative to rapid TSR systems containing C₂₊ hydrocarbons. When extrapolated to the temperature range of typical oil and gas reservoirs (100-200¡ã), the reaction rate of TSR by coronene is slightly higher than that of TSR involving methane, gypsum, and MgCl₂ solutions Depletion of some organic carbons by TSR may contribute to the increase of S/C ratios in the mol. structure of thermogenic pyrobitumen. In deep carbonate reservoirs of methane-dominated TSR, hydrothermal reduction of sulfates by thermogenic pyrobitumen most likely occurs as a less well-recognized geochem. process.

ACS Earth and Space Chemistry 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, Product Details of C24H12.

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

Wu, Weida published the artcileCharacterization and identification of pork flavor compounds and their precursors in Chinese indigenous pig breeds by volatile profiling and multivariate analysis, Category: catalysis-chemistry, the publication is Food Chemistry (2022), 132543, database is CAplus and MEDLINE.

Chinese indigenous pigs are favored for their rich flavor, which is generated through complex reactions involving lipid-oxidation-related flavor precursors. In this research, we characterized the aroma compounds and fatty acids of representative Chinese pig breeds by gas chromatog.-olfactometry-mass spectrometry (GC-O-MS) and GC-ion mobility spectrometry (GC-IMS) with multivariate anal. A total of 79 volatile compounds were identified, among which 15 compounds were selected as odorants in pork. According to multivariate statistical anal., some odorants, including hexanal, 1-octen-3-ol, 2,3-octanedione, (E, E)-2,4-decadienal and dodecanal could be discriminative compounds explaining breed-originated differences in flavor profiles. As confirmed by partial least squares regression (PLS-R), some fatty acids, including C18:1n9c, C22:6n3 and C18:3n3, were major precursors for the formation of rich flavor in indigenous pig breeds. These results revealed that fatty acids and volatile compounds were breed-dependent, and the differences in flavor were related to the variance in the fatty acid content.

Food Chemistry 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 C8H11BO2, Category: catalysis-chemistry.

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

Karatas, Yasar published the artcilePreparation and characterization of amine-terminated delafossite type oxide, CuMnO₂-NH₂, supported Pd (0) nanoparticles for the H₂ generation from the methanolysis of ammonia-borane, COA of Formula: C6H17NO3Si, the publication is International Journal of Hydrogen Energy (2022), 47(36), 16036-16046, database is CAplus.

Among the cuprous metal oxides of the delafossite type, which are generally formulated as CuMO₂ (M = Al, Cr, Fe, Ga, Mn), the most promising is the CuMnO₂ structures. CuMnO₂ material, named crednerite, is a very interesting delafossite derivative with potential applications in many fields, mainly catalyst, photoelectrochem. cells and multiferroic tools. Herein, we report fabrication, characterization, and application of amine-terminated CuMnO₂ (CuMnO₂-NH₂) supported palladium nanoparticles (Pd/CuMnO₂-NH₂) as highly efficient and recyclable catalysts for the hydrogen production from the methanolysis of ammonia-borane (AB). The results of characterization using P-XRD, TEM, HRTEM, TEM-EDX, XPS, SEM, SEM-elemental mapping, and ICP-OES disclose that Pd (0) nanoparticles were well spread on the surface of CuMnO₂-NH₂ with a mean particle size of 3.91 ¡À 0.33 nm. Pd/CuMnO₂-NH₂ shows high catalytic activity in the methanolysis of AB with an initial turnover frequency of 146.68 min-1 at 25 ¡À 0.1¡ãC which is one of the highest values ever reported for AB methanolysis in the literature. Besides, the extreme stability of Pd/CuMnO₂-NH₂ takes it a recyclable heterogeneous catalyst in this catalytic conversion.

International Journal of Hydrogen Energy published new progress about 13822-56-5. 13822-56-5 belongs to catalysis-chemistry, auxiliary class Organic Silicones, name is 3-(Trimethoxysilyl)propan-1-amine, and the molecular formula is C6H17NO3Si, COA of Formula: C6H17NO3Si.

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