Catalysis-chemistry

Nozawa-Kumada, Kanako published the artcileSuper electron donor-mediated reductive desulfurization reactions, Recommanded Product: Bis(4-fluorophenyl)methane, the publication is Chemical Communications (Cambridge, United Kingdom) (2019), 55(86), 12968-12971, database is CAplus and MEDLINE.

The desulfurization of thioacetals and thioethers by a pyridine-derived electron donor was described. This methodol. provided efficient accessed to the reduced products in high yields and did not require the use of transition-metals, elemental alkali-metals or hydrogen atom donors.

Chemical Communications (Cambridge, United Kingdom) 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, Recommanded Product: Bis(4-fluorophenyl)methane.

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

Fukumoto, Kazuki published the artcileExcess S-adenosylmethionine inhibits methylation via catabolism to adenine, Computed Properties of 63-68-3, the publication is Communications Biology (2022), 5(1), 313, database is CAplus and MEDLINE.

The global dietary supplement market is valued at over USD 100 billion. One popular dietary supplement, S-adenosylmethionine, is marketed to improve joints, liver health and emotional well-being in the US since 1999, and has been a prescription drug in Europe to treat depression and arthritis since 1975, but recent studies questioned its efficacy. In our body, S-adenosylmethionine is critical for the methylation of nucleic acids, proteins and many other targets. The marketing of SAM implies that more S-adenosylmethionine is better since it would stimulate methylations and improve health. Previously, we have shown that methylation reactions regulate biol. rhythms in many organisms. Here, using biol. rhythms to assess the effects of exogenous S-adenosylmethionine, we reveal that excess S-adenosylmethionine disrupts rhythms and, rather than promoting methylation, is catabolized to adenine and methylthioadenosine, toxic methylation inhibitors. These findings further our understanding of Me metabolism and question the safety of S-adenosylmethionine as a supplement.

Communications Biology 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 C5H11NO2S, Computed Properties of 63-68-3.

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

Minamide, Hiroaki published the artcileFrequency-agile terahertz-wave sources and applications to sensitive diagnosis of semiconductor wafers, Related Products of catalysis-chemistry, the publication is Proceedings of SPIE (2011), 80230I/1-80230I/6, database is CAplus.

We have developed ultra-widely tunable THz-wave source using organic nonlinear optical crystals such as 4- dimethylamino-N-methyl-4-stilbazolium tosylate (DAST) and N-benzyl-2-methyl-4-nitroaniline (BNA). The THz-wave difference frequency generation using these crystals covers the ultra-widely tunable range of 0.1-40 THz with frequency agility. Collaborating with Furukawa Co. Ltd., we used the progressive, frequency-agile THz-wave source for industrial applications and produced a sensitive, non-destructive method for examining carrier-d. and elec. properties of semiconductors. This method presents novel possibilities for use in the semiconductor industry.

Proceedings of SPIE 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, Related Products of catalysis-chemistry.

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

Flegler, Alexander published the artcileExogenous fatty acids affect membrane properties and cold adaptation of Listeria monocytogenes, Product Details of C22H32O2, the publication is Scientific Reports (2022), 12(1), 1499, database is CAplus and MEDLINE.

Listeria monocytogenes is a food-borne pathogen that can grow at very low temperatures close to the f.p. of food and other matrixes. Maintaining cytoplasmic membrane fluidity by changing its lipid composition is indispensable for growth at low temperatures Its dominant adaptation is to shorten the fatty acid chain length and, in some strains, increase in addition the menaquinone content. To date, incorporation of exogenous fatty acid was not reported for Listeria monocytogenes. In this study, the membrane fluidity grown under low-temperature conditions was affected by exogenous fatty acids incorporated into the membrane phospholipids of the bacterium. Listeria monocytogenes incorporated exogenous fatty acids due to their availability irresp. of their m.ps. Incorporation was demonstrated by supplementation of the growth medium with polysorbate 60, polysorbate 80, and food lipid extracts, resulting in a corresponding modification of the membrane fatty acid profile. Incorporated exogenous fatty acids had a clear impact on the fitness of the Listeria monocytogenes strains, which was demonstrated by analyses of the membrane fluidity, resistance to freeze-thaw stress, and growth rates. The fatty acid content of the growth medium or the food matrix affects the membrane fluidity and thus proliferation and persistence of Listeria monocytogenes in food under low-temperature conditions.

Scientific Reports 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, Product Details of C22H32O2.

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

Peng, Yunfei published the artcileDecarbonylative Reductive Coupling of Aromatic Esters by Nickel and Palladium Catalyst, Quality Control of 613-33-2, the publication is Chemistry Letters (2022), 51(7), 749-753, database is CAplus.

Ni or Pd-catalyzed decarbonylative reductive couplings of aromatic esters were developed. A range of (hetero)aromatic esters was applicable to these reductive homocoupling reactions. Moreover, it was found that Pd-catalysis enables a reductive decarbonylative cross-coupling between two different aromatic esters to afford a nonsym. biaryls system.

Chemistry 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, Quality Control of 613-33-2.

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

Shimada, Kazuaki published the artcileConvenient synthesis of 2,3-dihydro-1,2,4-thiadiazoles, 4,5-dihydro-1,3-thiazoles, and 1,3-thiazoles through a [4 + 1]-type oxidative ring closure of 1,3-thiaza-1,3-butadienes, Formula: C3H8N2S, the publication is Heterocycles (2020), 100(6), 881-900, database is CAplus.

1,3-Thiaza-1,3-butadienes bearing an N,N-dimethylamino group at the C-2 position were efficiently converted into 5H-1,2,4-oxathiazoles, 2,3-dihydro-1,2,4-thiadiazoles, 4,5-dihydro-1,3-thiazoles, and 1,3-thiazoles through an oxidative ring closure by treating with mCPBA, chloramine-T, metal carbenoids, or dichlorocarbene, resp., via the ring closure of in situ generated heterocumulene-type reactive species involving thione S-oxides, thione S-imides, and thiocarbonyl ylides.

Heterocycles published new progress about 6972-05-0. 6972-05-0 belongs to catalysis-chemistry, auxiliary class Thiourea,Amine,Aliphatic hydrocarbon chain,Amide, name is 1,1-Dimethylthiourea, and the molecular formula is C8H7ClO3, Formula: C3H8N2S.

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

Kaya, Dogan published the artcileMagnetically separable low Pt substituted Co nanoparticles: Investigation of structural, magnetic, and catalytic properties, Computed Properties of 13822-56-5, the publication is Physica B: Condensed Matter (Amsterdam, Netherlands) (2022), 413765, database is CAplus.

Developing multifunctional nanoparticles (NPs) for magnetic and catalytic purposes is crucial for controlling magnetic properties and reducing production costs. We synthesized Co and low Pt loaded CoPt NPs by the modified polyol process. Co and CoPt NPs exhibited coexist fcc and hcp phases which are confirmed with x-ray diffraction and Rietveld refinement anal. SEM images revealed the average size of the NPs smaller than 9 nm with a narrow distribution. An irreversible magnetization-temperature behavior of the particles is observed in the modes of zero-field cooled and field cooled with a strong ferromagnetic signal close to 350 K. The field-dependent magnetization up to ¡À5 T was investigated to determine coercive field (H_c), exchange bias (H_E), saturation magnetization (M_s), remanent magnetization (M_r), and the ratio of remanent magnetization to saturation magnetization (M_r/M_s). There is a general decrease in magnetic values due to an increase of both the temperature and the Pt ratio in Co nanoparticles. When the Pt/Co ratio drops to 1%, the sample was measured with the highest H_c value of 648.5 Oe and M_s value of 100 emu/g at 5 K. On the contrary, increasing the concentration of Pt to 10% resulted in a reduction for the M_s value below 40 emu/g. Besides, cyclic voltammetry measurements showed apparent hydrogen reduction in the potential range of -0.91 V and -0.96 V (vs Ag/AgCl) and 10% Pt loaded CoPt NPs exhibits the highest activity after 10th cycles and increase the activity up to 15.80 mA cm^-2 at -1.2 V due to the surfactant.

Physica B: Condensed Matter (Amsterdam, Netherlands) 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, Computed Properties of 13822-56-5.

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

Endo, Kohei published the artcileOne-Pot Synthesis of Symmetrical and Unsymmetrical Diarylmethanes via Diborylmethane, Name: Bis(4-fluorophenyl)methane, the publication is Journal of Organic Chemistry (2012), 77(17), 7223-7231, database is CAplus and MEDLINE.

A one-pot synthesis of diarylmethanes from air-stable diborylmethane via the Suzuki-Miyaura cross-coupling reaction is described. The present approach realizes the synthesis of various sym. and unsym. diarylmethanes in good to excellent yields.

Journal of Organic Chemistry 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, Name: Bis(4-fluorophenyl)methane.

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

Akai, Shuji published the artcileSynthesis of Long-Chain [¹⁸F]Deoxyfluoropoly(ethylene glycol) Methyl Ethers and Their Noninvasive Pharmacokinetic Analysis by Positron Emission Tomography, COA of Formula: C17H37NO3, the publication is Molecular Pharmaceutics (2011), 8(1), 302-308, database is CAplus and MEDLINE.

[¹⁸F]DeoxyfluoroPEG Me ethers with an average mol. weight of 2 kDa and 10 kDa were synthesized by the fluorination of the tosylates with [¹⁸F]nBu₄NF at 80 ¡ãC for 20 min followed by flash filtration through a Sep-Pak Plus Alumina-N cartridge. After the i.v. administration to rats, their pharmacokinetics was analyzed by noninvasive, real-time, whole-living-body monitoring using positron imaging technol. The effect of PEG’s mol. weight on their blood circulation and organ clearance were quant. visualized for the first time.

Molecular Pharmaceutics 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, COA of Formula: C17H37NO3.

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

Szpera, Robert published the artcileSynthesis of Fluorinated Alkyl Aryl Ethers by Palladium-Catalyzed C-O Cross-Coupling, Computed Properties of 17351-62-1, the publication is Organic Letters (2020), 22(16), 6573-6577, database is CAplus and MEDLINE.

Herein, we report a highly effective protocol for the cross-coupling of (hetero)aryl bromides with fluorinated alcs. using the com. available precatalyst ^tBuBrettPhos Pd G3 and Cs₂CO₃ in toluene. This Pd-catalyzed coupling features a short reaction time, excellent functional group tolerance, and compatibility with electron-rich and -poor (hetero)arenes. The method provides access to ¹⁸F-labeled trifluoroethyl ethers by cross-coupling with [¹⁸F]trifluoroethanol. Safety: 2-fluoroethanol is highly toxic.

Organic Letters 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 C12H9NO, Computed Properties of 17351-62-1.

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