Catalysis-chemistry

Fan, Xizheng published the artcileUltrafine and Highly Dispersed Pd/SiO₂ for Suzuki-Miyaura Cross-coupling Reactions, Computed Properties of 613-33-2, the publication is Catalysis Letters (2021), 151(8), 2291-2301, database is CAplus.

Construction of heterogeneous Pd/SiO₂ catalyst via the pollution-free strategy marked strong electrostatic adsorption has been reported for the application to Suzuki-Miyaura cross-coupling reactions. The exposed neg. charged oxygen groups, which were converted from the hydroxyl groups on the surface of silica under the alk. atm., could effectively anchor palladium species to form ultrafine Pd nanoparticles (Pd NPs) with an average particle size of 1.3 nm and high dispersion (43%). Pd/SiO₂ catalyst was endowed with the excellent catalytic performance which was that the yield of the Suzuki-Miyaura reaction between bromobenzene and phenylboronic acid at 40¡ãC was > 99% for 30 min and the TOF was ? 80,000 h^-1. The catalyst could be easily recovered and recycled by facile procedure without a significant decrease in catalytic activity, which was able to maintain the 90% yield after repeated for 8 times. In addition, a continuous flow reaction device was designed using the Pd/SiO₂ catalyst to effectively improve the production efficiency of biphenyl.

Catalysis Letters published new progress about 613-33-2. 613-33-2 belongs to catalysis-chemistry, auxiliary class Benzene, name is 4,4′-Dimethyldiphenyl, and the molecular formula is C14H14, Computed Properties of 613-33-2.

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

Zhou, Binghua published the artcileGluconic acid aqueous solution as a sustainable and recyclable promoting medium for organic reactions, Product Details of C10H11NO4, the publication is Green Chemistry (2011), 13(8), 2204-2211, database is CAplus.

For the first time, gluconic acid aqueous solution (GAAS), a biobased weakly acidic liquid, was used as an effective promoting medium for organic reactions, such as the Michael addition of indoles to ¦Á,¦Â-unsaturated ketones, the electrophilic ring-opening reaction of 3,4-dihydropyran with indoles and Friedel-Crafts alkylation of electron-rich aromatics with benzyl alcs. The concept of using GAAS as a solvent for organic reactions not only offers a sustainable candidate for progress in solvent innovation, but also opens up a new avenue for the utilization of this biobased polyhydroxylated acid. Among the features that render GAAS as a solvent so interesting is the ability to act as both the reaction medium and catalyst. Moreover, this methodol. offers significant improvements with regard to the yield of products, simplicity in operation, cost efficiency and green aspects, in terms of avoiding toxic catalysts and minimizing the generation of waste.

Green Chemistry published new progress about 4230-93-7. 4230-93-7 belongs to catalysis-chemistry, auxiliary class Alkenyl,Nitro Compound,Benzene,Ether, name is 1,2-Dimethoxy-4-(2-nitrovinyl)benzene, and the molecular formula is C12H23N3S, Product Details of C10H11NO4.

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

Zhang, Xiao-Ming published the artcileAllylic Arylation of 1,3-Dienes via Hydroboration/Migrative Suzuki-Miyaura Cross-Coupling Reactions, Application In Synthesis of 4141-48-4, the publication is ACS Catalysis (2018), 8(7), 6094-6099, database is CAplus.

The hydroboration/Pd-catalyzed migrative Suzuki-Miyaura cross-coupling of 1,3-dienes with electron-deficient aryl halides has been developed, which enables the synthesis of branched allylarenes directly from primary homoallylic alkyl boranes. A ligand-tuned linear- or branch-selective coupling for these aryl halides has also been achieved.

ACS Catalysis 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 C16H12O, Application In Synthesis of 4141-48-4.

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

Yu, Yi-fan published the artcileComparative transcriptome and metabolome analyses reveal the methanol dissimilation pathway of Pichia pastoris, Application of (S)-2-Amino-4-(methylthio)butanoic acid, the publication is BMC Genomics (2022), 23(1), 366, database is CAplus and MEDLINE.

Pichia pastoris (Komagataella phaffii) is a model organism widely used for the recombinant expression of eukaryotic proteins, and it can metabolize methanol as its sole carbon and energy source. Methanol is oxidized to formaldehyde by alc. oxidase (AOX). In the dissimilation pathway, formaldehyde is oxidized to CO2 by formaldehyde dehydrogenase (FLD), S-hydroxymethyl glutathione hydrolase (FGH) and formate dehydrogenase (FDH). The transcriptome and metabolome of P. pastoris were determined under methanol cultivation when its dissimilation pathway cut off. Firstly, ¦¤fld and ¦¤fgh were significantly different compared to the wild type (GS115), with a 60.98% and 23.66% reduction in biomass, resp. The differential metabolites between GS115 and ¦¤fld were mainly enriched in ABC transporters, amino acid biosynthesis, and protein digestion and absorption. Secondly, comparative transcriptome between knockout and wild type strains showed that oxidative phosphorylation, glycolysis and the TCA cycle were downregulated, while alc. metabolism, proteasomes, autophagy and peroxisomes were upregulated. Interestingly, the down-regulation of the oxidative phosphorylation pathway was pos. correlated with the gene order of dissimilation pathway knockdown. In addition, there were significant differences in amino acid metabolism and glutathione redox cycling that raised our concerns about formaldehyde sorption in cells. This is the first time that integrity of dissimilation pathway anal. based on transcriptomics and metabolomics was carried out in Pichia pastoris. The blockage of dissimilation pathway significantly down-regulates the level of oxidative phosphorylation and weakens the methanol assimilation pathway to the point where deficiencies in energy supply and carbon fixation result in inefficient biomass accumulation and genetic replication. In addition, transcriptional upregulation of the proteasome and autophagy may be a stress response to resolve formaldehyde-induced DNA-protein crosslinking.

BMC Genomics 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 C22H18O2, Application of (S)-2-Amino-4-(methylthio)butanoic acid.

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

Wang, Guo-Qiao published the artcileConformational Transition-Triggered Disassembly of Therapeutic Peptide Nanomedicine for Tumor Therapy, Safety of Fmoc-Pro-OH, the publication is Advanced Healthcare Materials (2021), 10(24), 2100333, database is CAplus and MEDLINE.

Cationic therapeutic peptides have received widespread attention due to their excellent antibacterial and antitumor properties. However, most of these peptides have undesirable delivery efficiency and high hemolytic toxicity due to the pos. charged ¦Á-helix structure containing many lysine and arginine, which may restrict its in vivo applications. Herein, a conformationally transformed therapeutic peptide Pep-HCO₃ modified with bicarbonates on guanidine groups is designed. Such a design allows Pep-HCO₃ ((nap-RAGLQFPVGRLLRRLLRRLLR) nHCO₃) to self-assemble into nanoparticles (NP-Pep) due to disrupting helix folding and the formation of intermol. hydrogen bonding between bicarbonates and guanidine groups. When pH is from 7.4 to 6.5 at the tumor sites, guanidine bicarbonate can be hydrolyzed to form CO₂ and guanidine groups, resulting in the disassembling of the NP-Pep into monomers ¦Á-Pep with a pos. charged ¦Á-helix structure. In vivo, NP-Pep not only inhibits the tumor growth of xenografted mice with a twofold enhanced inhibition rate compared with ¦Á-Pep treatment group, but also significantly reduces the hemolytic toxicity by responding to the pH of tumor microenvironment. Therefore, the strategy of conformational transition-triggered disassembly of nanoparticles allows efficient delivery of cationic therapeutic peptides and lowering the hemolytic toxicity, which may provide an avenue for developing high-performance cationic peptide in vivo applications.

Advanced Healthcare Materials published new progress about 71989-31-6. 71989-31-6 belongs to catalysis-chemistry, auxiliary class Amino acide derivatives,pyrrolidine, name is Fmoc-Pro-OH, and the molecular formula is C20H17FO4S, Safety of Fmoc-Pro-OH.

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

Liu, Yushan published the artcileFluorescent thermochromic wood-based composite phase change materials based on aggregation-induced emission carbon dots for visual solar-thermal energy conversion and storage, Computed Properties of 119-80-2, the publication is Chemical Engineering Journal (Amsterdam, Netherlands) (2021), 130426, database is CAplus.

Efficient solar-thermal energy conversion and storage is significant to overcome current energy shortage problems. Monitoring solar-thermal energy storage process by an evident and convenient display is conducive to improving energy utilization. Herein, fluorescent thermochromic wood-based composite phase change materials (WPCMs) were constructed for visual solar-thermal energy conversion and storage. It was fabricated by encapsulating polyethylene glycol (PEG) and aggregation-induced emission carbon dots (AIE-CDs) showing blue dispersed emission and red aggregation-induced emission into delignified wood (DW). The DW well-preserved the distinctive anisotropic porous structure and prevented the leakage problem of PEG. The WPCMs possessed great solar-thermal conversion capacity benefitting from strong and broad solar light absorption behaviors of AIE-CDs. Addnl., WPCMs showed real-time and visual fluorescent thermochromic property, it exhibited red AIE, and the fluorescence (FL) decreased and shifted into the blue emission band under solar radiation. The solar-thermal energy conversion and storage led to solid-liquid transformation of WPCMs, which promoted AIE-CDs’ dispersion, thereby changing the FL. It also exhibited a high latent heat of fusion (160.8 J¡¤g^-1), favorable stability over 150 heating-cooling cycles, thermal stability below 210¡ãC and good shape stability. The WPCMs can be extended to applications in energy-saving buildings and optical lighting materials with visual thermal regulation capability.

Chemical Engineering Journal (Amsterdam, Netherlands) 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, Computed Properties of 119-80-2.

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

Li, Jiang-Sheng published the artcilet-BuONa-Mediated Transition-Metal-Free Autoxidation of Diarylmethanes to Ketones, Safety of Bis(4-fluorophenyl)methane, the publication is Synlett (2017), 28(8), 994-998, database is CAplus.

Autoxidative sp³ C-H transformation of diarylmethanes ArCH₂Ar¹ (Ar = Ph, 2-chlorophenyl, 3,4-dimethylphenyl, etc.; Ar¹ = 2-methoxyphenyl, 4-nitrophenyl, 3,4-dichlorophenyl, etc.) has been demonstrated using O₂-mediation by t-BuONa. This protocol enables an alternative route for the access to diaryl ketones ArC(O)₂Ar¹ from benzyl derivatives in good to excellent yields under mild reaction conditions, without transition metal catalysts or addnl. chem. oxidants.

Synlett 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 C13H10F2, Safety of Bis(4-fluorophenyl)methane.

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

Chen, Xiaofei published the artcileReinforced catalytic oxidation of polyoxometalate@charge transfer complex by on-site heating from photothermal conversion, Safety of 2-Methylbenzoic acid, the publication is Chemical Engineering Journal (Amsterdam, Netherlands) (2022), 446(Part_2), 137134, database is CAplus.

Near IR (NIR) absorption at low energy region has been demonstrated to devoted to photothermal conversion efficiently. This process provides a possibility for valuable extension in emerging photothermal catalysis following a specific approach of mol. composition To exploit novel photothermal materials in increasing the catalytic activity of comment catalysts, a typical yet unnoticed charge transfer (CT) complex of 3,3¡ä,5,5¡ä-tetramethylbenzidine (TMB_CT) is used here as an on-site heater. Through the electrostatic complexation of cationic CT complex bearing strong NIR absorption with series polyanionic clusters, composite catalysts are prepared These nano-assembled catalysts in size of 5-10 nm display integrated NIR photothermal effect and highly enhanced catalysis for the mild oxidation of toluene and its derivatives into corresponding alcs. with high conversion and selection. While NIR photothermal stability of TMB_CT is maintained, the catalytic activity of inorganic clusters is largely improved. The increments in conversion unattainable under external heating condition are realized and the extension to the mild oxidation of thioethers and olefins into sulfoxides and epoxides with acceptable catalytic recyclability and structural stability are demonstrated. All results from the detailed characterizations figure out the applicability of the NIR photothermal conversion to the catalytic reactions with similar catalytic centers.

Chemical Engineering Journal (Amsterdam, Netherlands) published new progress about 118-90-1. 118-90-1 belongs to catalysis-chemistry, auxiliary class Carboxylic acid,Benzene,Natural product, name is 2-Methylbenzoic acid, and the molecular formula is C8H8O2, Safety of 2-Methylbenzoic acid.

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

Sugita, Atsushi published the artcilePhoto-excited state of N-benzyl MNA studied by femtosecond time-resolved absorption spectroscopy, Related Products of catalysis-chemistry, the publication is Chemical Physics Letters (2003), 382(5,6), 693-698, database is CAplus.

Ultrafast photoexcitation dynamics of N-benzyl-2-Me-4-nitroaniline was studied with femtosecond time-resolved absorption spectroscopy. The photo-induced absorption spectrum was found to consist of 3 transient components with different decay times. A 260 fs-decay time stimulated emission appeared during a geometrical relaxation from a charge-transfer excited state to a geometrically relaxed excited state. A following energy relaxation of the geometrically relaxed excited state was completed within 680 fs. Third 2.6 ps decay time reflected a cooling process of hot electrons in a ground state potential.

Chemical Physics Letters published new progress about 201157-13-3. 201157-13-3 belongs to catalysis-chemistry, auxiliary class Nitro Compound,Amine,Benzene, name is N-Benzyl-2-methyl-4-nitroaniline, and the molecular formula is C9H9BrO2, Related Products of catalysis-chemistry.

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

Fujiwara, Masazumi published the artcileSecond order nonlinear optical properties of the single crystal of N-benzyl 2-methyl-4-nitroaniline: anomalous enhancement of the d₃₃₃ component and its possible origin, Quality Control of 201157-13-3, the publication is Japanese Journal of Applied Physics, Part 1: Regular Papers, Brief Communications & Review Papers (2006), 45(11), 8676-8685, database is CAplus.

A single crystal of N-benzyl 2-methyl-4-nitroaniline (BNA) whose dimensions were 8 ¡Á 10 mm (diameter ¡Á length) was grown using a vertical Bridgman method with sufficient optical transparency for spectroscopic use. Polarized reflection spectra of the crystal were measured in order to determine its linear optical parameters (refractive indexes and extinction coefficients). The relative magnitudes of the d-tensor components of the crystal were determined to be d₃₃₃ = (17 ¡À 9) ¡Á d₃₂₂, d₃₂₂ > d₃₁₁, d₃₁₁ ? 0 from polarization dependencies of the second harmonic generation. These results are in disagreement with previously reported theor. studies, in which the effects of intermol. interactions were completely neglected. Here, we have included these intermol. interactions in the calculations assuming the presence of supra-mol. clusters. We conclude that the anomalous enhancement of d₃₃₃ is due to the interactions along the direction of the hydrogen bonds in the crystal and the resonance effect.

Japanese Journal of Applied Physics, Part 1: Regular Papers, Brief Communications & Review Papers published new progress about 201157-13-3. 201157-13-3 belongs to catalysis-chemistry, auxiliary class Nitro Compound,Amine,Benzene, name is N-Benzyl-2-methyl-4-nitroaniline, and the molecular formula is C14H14N2O2, Quality Control of 201157-13-3.

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