Catalysis-chemistry

Stokes, E. D. published the artcileHigh efficiency dye laser tunable from the UV to the IR, Application of 5,9-Diaminobenzo[a]phenoxazin-7-ium acetate, the publication is Optics Communications (1972), 5(4), 267-70, database is CAplus.

A dye laser was developed as a source of tunable radiation at 3500-7300 ?. A variety of dyes and dye mixtures were used to cover this range. Output powers ¡Ü30 kW were obtained with line widths <1.8 ?. A Fabry-Perot etalon reduced the output line width of 0.1 ? and the peak output power by a factor of 3. Second harmonic powers in excess of 2 kW were generated from the output of this laser. The efficient 2nd harmonic generation extended the lower wavelength limit to 2442 A. A N laser was used as pumping source.

Optics Communications 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 C8H7NO4, Application of 5,9-Diaminobenzo[a]phenoxazin-7-ium acetate.

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

Giguere, Raymond J. published the artcileIntramolecular [3 + 4] allyl cation cycloaddition: novel route to hydroazulenes, Recommanded Product: Allyldiphenylphosphine oxide, the publication is Tetrahedron Letters (1988), 29(47), 6071-4, database is CAplus.

Intramol. Hoffmann-Noyori reaction of acyclic trienol I permits direct entry to hydroazulenes II with modest diastereoselectivity. Cycloaddition precursor I is readily prepared from 1,5-pentanediol in seven steps.

Tetrahedron Letters 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, Recommanded Product: Allyldiphenylphosphine oxide.

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

Larde, H. published the artcileAn observational cohort study on antimicrobial usage on dairy farms in Quebec, Canada, Recommanded Product: N1,N2-Dibenzylethane-1,2-diamine, the publication is Journal of Dairy Science (2021), 104(2), 1864-1880, database is CAplus and MEDLINE.

Quantification of antimicrobial usage (AMU) is crucial to measure the effect of intervention programs, to determine associations between usage and resistance, to compare populations, and for benchmarking purposes. The primary objective of the study was to describe quant. the AMU on Quebec dairy farms over 1 yr: (1) the total AMU, (2) the AMU per administration route (intramammary, injectable, oral, intrauterine), and (3) the AMU per antimicrobial class and according to the categorizations of Health Canada and the World Health Organization. The secondary objective was to assess the effect of several characteristics (herd size, level of milk production, and incidence rate of common infectious diseases) on AMU rate. The AMU data were obtained for 101 dairy farms randomly selected in 3 important Quebec dairy regions by collecting and recording all empty drug packaging and invoices for medicated feed (spring 2017 to spring 2018). The AMU rate was reported in number of Canadian defined course doses for cattle per 100 cow-years. The average herd size was 67 cows per farm, and 2/101 farms were certified organic Overall, an estimated mean of 537 Canadian defined course doses for cattle/100 cow-years was observed The intramammary route during lactation was the most frequently observed, followed, in decreasing order of usage, by oral route in the feed, intramammary route at drying-off, and injectable route. Oral (other than in animal feed) and intrauterine formulations were infrequently collected from the garbage cans. The 5 most frequently observed antimicrobial classes were, by decreasing order of usage, ionophores, penicillins, aminocoumarins, aminoglycosides, and polymyxins. Highest priority critically important antimicrobials as defined by the World Health Organization were mainly collected from intramammary formulations during lactation followed by injectable and drying-off intramammary formulations. The herd size was pos. associated with the total AMU rate but not with the usage rate of highest priority critically important antimicrobials. Incidence of diseases along with preventive use of antimicrobials (drying-off and medicated feed with antimicrobials) explained 48% of the variance in total AMU rate.

Journal of Dairy Science published new progress about 140-28-3. 140-28-3 belongs to catalysis-chemistry, auxiliary class Benzenes, name is N1,N2-Dibenzylethane-1,2-diamine, and the molecular formula is C16H20N2, Recommanded Product: N1,N2-Dibenzylethane-1,2-diamine.

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

Gallo, Rafael D. C. published the artcileA Selective C-C Bond Cleavage Strategy Promoted by Visible Light, Computed Properties of 104-03-0, the publication is Organic Letters (2021), 23(22), 8916-8920, database is CAplus and MEDLINE.

A new visible-light-promoted reaction between aryldiazoacetates ArC(=N₂)COOR¹ (Ar = Ph, 4-chlorophenyl, 3,5-dimethoxypheny, etc.; R¹ = Me, Bn, i-Pr, allyl) and 1,3-diketones R²C(O)CH₂C(O)R³ (R² = Me, 4-chlorophenyl, cyclopropyl, etc.; R³ = Me, Ph, 2-methoxyphenyl, etc.) allows good yields and selectivities for C-C bond insertions, leading to the corresponding 1,4-dicarbonyl compounds R²C(O)C(COOR¹)(Ar)CH₂C(O)R³ . This transformation is straightforward and highly practical. It tolerates air and moisture and does not require the use of any metals. Mechanistic investigations support the involvement of a key cyclopropanol intermediate derived from an intramol. rearrangement.

Organic Letters 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, Computed Properties of 104-03-0.

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

Fonseca, Vanessa F. published the artcileFatty acid-based index development in estuarine organisms to pinpoint environmental contamination, Recommanded Product: Docosahexaenoic Acid, the publication is Marine Pollution Bulletin (2022), 113805, database is CAplus and MEDLINE.

Estuaries have long been preferred areas of human settlement, where multiple anthropogenic activities take place, which have contributed to a significant decrease in environmental quality of these ecosystems. Accordingly, environmental monitoring and management have long relied on the development of tools that summarize and simplify complex information and provide direct interpretation of quality status. Here, the fatty acid profiles of three abundant estuarine species, namely Hediste diversicolor, Carcinus maenas and Pomatoschistus microps, were used to develop and validate a multimetric index, based on the Euclidean dissimilarities of profiles between sites, in response to contamination gradient in a large urban estuary. Spatial differences were generally related to unsaturated fatty acids (mono- and polyunsaturated, of the n-3 and n-6 series) in all species, albeit more pronounced in P. microps. Multivariate models returned high classification accuracies for the three sampled sites, varying from 73.3% in the invertebrate species to 100.0% in the fish species. Results show the applicability of the developed FA-based index, particularly due to the easy of communication, for managers and the public alike, but also highlight the need for prior validation on species suitability or sensitivity to depict environmental contamination.

Marine Pollution Bulletin 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, Recommanded Product: Docosahexaenoic Acid.

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

Tortajada, Andreu published the artcileCatalytic Decarboxylation/Carboxylation Platform for Accessing Isotopically Labeled Carboxylic Acids, Recommanded Product: 2-Methyl-4-phenylbutanoic acid, the publication is ACS Catalysis (2019), 9(7), 5897-5901, database is CAplus.

An integrated catalytic decarboxylation/carboxylation for accessing isotopically labeled carboxylic acids with ¹³CO₂ or ¹⁴CO₂ is described. The method shows a wide scope under mild conditions, even in the context of late-stage functionalization, and does not require stoichiometric organometallics, thus complementing existing carbon-labeling techniques en route to carboxylic acids.

ACS Catalysis published new progress about 1949-41-3. 1949-41-3 belongs to catalysis-chemistry, auxiliary class Carboxylic acid,Benzene, name is 2-Methyl-4-phenylbutanoic acid, and the molecular formula is C15H21BO2, Recommanded Product: 2-Methyl-4-phenylbutanoic acid.

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

Xin, Hong published the artcileVisible Light-Driven, Copper-Catalyzed Aerobic Oxidative Cleavage of Cycloalkanones, COA of Formula: C10H10O3, the publication is Journal of Organic Chemistry (2021), 86(12), 8263-8273, database is CAplus and MEDLINE.

A visible light-driven copper-catalyzed aerobic oxidative cleavage of cycloalkanones was presented. A variety of cycloalkanones with varying ring sizes and various ¦Á-substituents reacted well to give the distal keto acids or dicarboxylic acids with moderate to good yields.

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 C9H7NO4, COA of Formula: C10H10O3.

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

Ye, Wenfa published the artcileRapid synthesis method for preparation of phenylenedioxydiacetic acid, Product Details of C10H10O6, the publication is Huaxue Shiji (2002), 24(6), 363, 378, database is CAplus.

A rapid synthetic method was used to prepare o(m,p)-phenylenedioxydiacetic acid from benzenediols and chloroacetic acid, it shortened the reaction time, raised the yield and simplified the post-treatment.

Huaxue Shiji published new progress about 5411-14-3. 5411-14-3 belongs to catalysis-chemistry, auxiliary class Carboxylic acid,Benzene,Ether, name is 2,2-(1,2-Phenylenebis(oxy))diacetic acid, and the molecular formula is C22H38O2, Product Details of C10H10O6.

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

Huang, Rui published the artcileHighly stretchable polyurethane coating based on functionalized cerium oxide nanoparticles for anti-corrosive/UV protection, Formula: C6H17NO3Si, the publication is Journal of Applied Polymer Science (2022), 139(15), 51927, database is CAplus.

To prolong the active life of carbon steel in corrosive environment, it is an effective way to use inorganic nano-pigments in polyurethane (PU) coatings. In this work, the CeO₂ nanoparticles are modified by APTMS (labeled as mCeNPs), and the organic-inorganic nanocomposite coating is prepared The morphol. and structure of PU/mCeNPs composites are characterized by field emission SEM, transmission electron microscopy, and Fourier transform IR spectroscopy. The mech. and UV resistance properties of compound material are studied by UV spectroscopy and universal tensile testing machine. The corrosion resistance of PU/mCeNPs coatings are investigated by Tafel polarization technique and electrochem. impedance spectroscopy. The results show that the PU composite coating with mCeNPs additive had high long-term corrosion resistance. Under the optimum conditions, when mCeNPs accounted for 5% of PU, the nanocomposite coatings show excellent UV resistance, excellent mech. properties, and long-term corrosion resistance due to the characteristics of ceria and its good dispersion in PU.

Journal of Applied Polymer Science 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, Formula: C6H17NO3Si.

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

Wang, Lizhi published the artcileOn-site measured emission factors of polycyclic aromatic hydrocarbons for different types of marine vessels, Safety of Coronene, the publication is Environmental Pollution (Oxford, United Kingdom) (2022), 118782, database is CAplus and MEDLINE.

A portable emission sampling system was used to perform on-site measurements of the emission factors (EFs; quantities of pollutants emitted per unit of energy consumed) of 29 polycyclic aromatic hydrocarbons (PAHs) for five types of marine vessels using light diesel in Hainan Province, China. Both gaseous- and particulate-phase PAHs from vessel emissions were sampled and measured using gas chromatog. coupled with mass spectrometry (GC-MS), and the PAH EFs were calculated based on the carbon mass balance method. The average EFs of gaseous- and particulate-phase PAHs were 6.2 ¡À 7.8 and 17 ¡À 26 mg/kg, with naphthalene (NAP) and phenanthrene (PHE) dominating the gaseous- and particulate-phase PAH emissions, resp. Among the five types of vessels, the EFs for small fishing boats were significantly higher than those for other types of vessels, and the lowest EFs were found for tug boats. Composition profiles and typical isomer ratios of PAHs were calculated for five types of vessels. Particulate-phase PAHs accounted for 63 ¡À 16% of the total emissions of 29 PAH species, and the particulate/gaseous-phase partitioning of PAHs was dominated by organic carbon (OC) absorption rather than black carbon (BC) adsorption. Emission factors of PAHs under different activity conditions were measured and calculated, and relatively higher EFs were found in the maneuvering mode for medium fishing boats and in the operating mode for engineering vessels. No significant differences were found among the PAH composition profiles under different activity conditions.

Environmental Pollution (Oxford, United Kingdom) 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 C10H10O6, Safety of Coronene.

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