Month: November 2022

Correa, N. Mariano published the artcileBinding of nitrodiphenylamines to reverse micelles of AOT in n-hexane and carbon tetrachloride: solvent and substituent effects, Recommanded Product: Bis(4-nitrophenyl)amine, the publication is Journal of Colloid and Interface Science (1998), 208(1), 96-103, database is CAplus and MEDLINE.

The absorption spectra of N-[2-(trifluoromethyl)-4-nitrophenyl]-4-nitroaniline (1), N-[4-nitrophenyl]-4-nitroaniline (2), and N-[2-nitrophenyl]-4-nitroaniline (3) were analyzed in reversed micelles of AOT (sodium 1,4-bis(2-ethylhexyl sulfosuccinate)) in n-hexane and carbon tetrachloride. For 1 and 2 the intensity of the band characteristic for the pure solvent decreases as the AOT concentration increases and a new band develops. This new band is attributed to the solute bound to the micelle. These changes allowed us to determine the binding constant (Kb) between these compounds and AOT. Kb at W₀ = [H₂O]/[AOT] = 0 in n-hexane varies from 81 for 1 to 5092 for 2. Although similar trends are observed for carbon tetrachloride, the values of Kb are smaller than those for n-hexane. The possible solute-solvent interactions of these compounds were analyzed by means of Taft and Kamlet’s solvatochromic comparison method. The strength of binding is interpreted considering their hydrogen-bond donor ability as well as their solubility in the pure solvents. For 1 Kb decreases as W₀ is increased, while for 2 no variation was observed These effects are discussed in terms of nitrodiphenylamine-water competition for interfacial binding sites. Moreover, the effect of the solute size and the presence of the trifluoromethyl group in 1 are important factors to consider in explaining its binding behavior. The spectra of 3 change very little with AOT concentration and only a slight bathochromic shift is observed Thus, 3 acts as nonhydrogen bond donor solute, merely sensing a slight change in the polarity of its microenvironment. (c) 1998 Academic Press.

Journal of Colloid and Interface Science published new progress about 1821-27-8. 1821-27-8 belongs to catalysis-chemistry, auxiliary class Nitro Compound,Amine,Benzene, name is Bis(4-nitrophenyl)amine, and the molecular formula is C12H9N3O4, Recommanded Product: Bis(4-nitrophenyl)amine.

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

Quillet, Jean P. published the artcileDismutation of 3,4-dihydronaphthalenic compounds. II., Category: catalysis-chemistry, the publication is Bulletin de la Societe Chimique de France (1967), 255-60, database is CAplus.

cf. CA 64: 14122c. Ketones of the type I were treated with MeMgI to give II. The dismutation of II (R = R1 = R2 = H) gave a mixture containing 1-methyl-1,2,3,4-tetrahydronaphthalene (III) and 1-MeC10H7 (IV). Thus, a mixture of 93 g. PhCH2CH2CH(CO2Et)2 and 800 ml. 5% NaOH was refluxed 3 hrs. to give 90% 4-phenylbutyric acid (V), b15 170-1¡ã. Also prepared were PhCHR2CHR1CHRCO2H (R, R1, R2, b.p./mm., m.p., and % yield given): Me, H, H, -, -, -; H, H, Ph, 185-9¡ã/1, 103-6¡ã, 70; H, Ph, H, 188-9¡ã/0.3, 92-3¡ã, 70; Ph, H, H, -, 70-1¡ã, 70. V (1 mole) was treated with 150 g. SOCl2 to give 4-phenylbutyryl chloride (VI). Similarly prepared were PhCHR2CHR1CHRCOCl (R, R1, and R2 given): Me, H, H; H, H, Ph; H, Ph, H; Ph, H, H. VI (70 g.) was treated with 51 g. AlCl3 in C6H6 and the mixture hydrolyzed with HCl to give 70% 1-tetralone (VII), b12 129-30¡ã. Similarly prepared were I (R, R1, R2, b.p./mm., m.p., and % yield given): H, Me, H, 133-4¡ã/13, -, 74 (semicarbazone m. 189¡ã); Me, H, H, -, -, -; H, H, Ph, 135-40¡ã/0.1, 76¡ã, 81; H, Ph, H, 162-5¡ã/0.1, 64¡ã, 81; Ph, H, H, 170¡ã/0.3, 76¡ã, 79. A solution of 22 g. VII in ether was treated with a solution containing MeMgI (prepared from 23.5 g. MeI and 3.6 g. Mg) to give 57% 1-methyl-1-tetralol, m. 86¡ã, which was dehydrated to give 1-methyl-3,4-dihydronaphthalene (VIII). Similarly prepared were II (R, R1, R2, b.p./mm., n25D, and % yield given): H, Me, H, 116¡ã/18, 1.559, 58; Me, H, H, -, -, -; H, H, Ph, 130-2¡ã/1, -, 80; H, Ph, H, 132-5¡ã/2.5, 1.611, 60; Ph, H, H, -, -, 72 (m. 76¡ã). VII (1 g.) was added dropwise to 7 ml. H2SO4 to give a mixture containing 3% VII, 54% III, and 43% IV. A mixture of 1 g. VIII in 10 ml. HBr azeotrope was refluxed 1 hr. to give a mixture of 64% VIII, 19% III, and 17% IV. A mixture of 1 g. VIII and 10 ml. Bradsher reagent (CA 40: 57069) was refluxed 30 min. to give a mixture containing 16% VIII, 41.5% III, and 42.5% IV as compared with 6.5, 51, and 42, resp., after 1.5 hrs. of refluxing. The other II, when treated with Bradsher reagent, behaved similarly.

Bulletin de la Societe Chimique de France 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 C11H14O2, Category: catalysis-chemistry.

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

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