Month: December 2022

Yao, Min-Liang published the artcileDeoxygenation of benzylic alcohols using chloroboranes, Product Details of C13H10F2, the publication is Tetrahedron Letters (2010), 51(5), 853-855, database is CAplus.

Boron-based methods for the preparation of diarylmethanes by deoxygenation of benzylic alcs. via the corresponding alkoxides are reported. The deoxygenation reaction proceeds efficiently at room temperature to give products in moderate to high yields.

Tetrahedron 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 C27H39ClN2, Product Details of C13H10F2.

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

Kelly, Donovan P. published the artcilePhotochemical rearrangement of aromatic ethers, COA of Formula: C12H16O3, the publication is Australian Journal of Chemistry (1969), 22(5), 977-91, database is CAplus.

The irradiation of various types of aromatic ethers with uv light yields o- and p-substituted phenols, resulting from C-O bond fission followed by recombination of the 2 fragments. Also formed in these photolyses was the parent phenol, produced presumably by abstraction of H from the solvent by the aryloxy fragment. The ethers investigated were aryloxyacetic acids, allyl aryl ethers, benzyl phenyl ether, and diphenyl ether. Mixture experiments have shown that for both the aryloxyacetic acids and allyl aryl ethers the rearrangement is intramol. and most probably proceeds by formation of a radical-pair enclosed in a solvent cage.

Australian Journal of Chemistry 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, COA of Formula: C12H16O3.

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

Paczkowski, Jerzy published the artcileGeneralization of the Kinetic Scheme for Photoinduced Polymerization via an Intermolecular Electron Transfer Process. 2. Application of the Marcus Theory, Formula: C14H23N, the publication is Macromolecules (1996), 29(15), 5057-5064, database is CAplus.

A theor. description of the kinetics of free-radical dye-initiated photopolymerization via an intermol. electron transfer process is given. Anal. considers the properties of organic redox pair forming initiating radicals. An application of the Marcus theory gives the kinetic scheme, which considers both the thermodn. and kinetic aspects of the electron transfer process. The anal. shows that both the reactivity of free radicals resulting from the photoinduced intermol. electron transfer (PET) process and the rate of the PET process can limit the rate of the polymerization initiation process. The theory is supported by exptl. data. Several organic redox pairs forming free radicals were tested. As the electron-accepting mols., xanthene dyes and camphorquinone were tested. As the electron donors, tertiary aromatic amines (TAAs) and N-phenylglycines (NPGs) were used. Several important conclusions are drawn from the theor. and exptl. data. For the process with the rate of PET much lower than the rate of the diffusion-controlled process, the Marcus theory can be used for analyzing or predicting the ability of organic redox systems for light-induced free radical polymerization For the process controlled by the diffusion, the reactivity of radicals formed as a result of the PET process limits the rate of the polymerization initiation. This relationship can also be presented as a function of thermodn. driving forces of the photoredox reaction (-¦¤G¡ã). The rate of photoinitiated polymerization can be described as a function of thermodn. driving forces of the photoredox reaction (-¦¤G¡ã; described by the Rehm-Weller equation) of the organic donor-acceptor pair. For the photoinduced electron transfer occurring much slower than diffusion-controlled processes, the relationship between the rate of polymerization and -¦¤G¡ã presents a classical Marcus parabolic relationship. For PET controlled by diffusion, the relationship between the rate of polymerization and -¦¤G¡ã is dependent on the reactivity of free radicals resulting from the PET process and gives a linear relationship indicating the inverted region-like kinetic behavior.

Macromolecules published new progress about 2909-77-5. 2909-77-5 belongs to catalysis-chemistry, auxiliary class Amine,Benzene, name is 2,6-Diisopropyl-N,N-dimethylaniline, and the molecular formula is C14H23N, Formula: C14H23N.

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

Liebing, Phil published the artcileSupramolecular Aggregation of Perfluoroorganyl Iodane Reagents in the Solid State and in Solution, HPLC of Formula: 1206-46-8, the publication is European Journal of Organic Chemistry (2018), 2018(27-28), 3771-3781, database is CAplus.

The crystal structures of different perfluoroorganyl iodanes are described, including those of four new benziodoxole derivatives with R_F = n-C₃F₇, n-C₄F₉, n-C₈F₁₇, and C₆F₅. In all of the compounds, the iodine atom shows significant Lewis acidity, and the fourth coordination site is readily filled by secondary bonding interactions to produce square-planar coordination. Although this geometry is a good model for benziodoxoles, benziodoxolone derivatives tend to aggregate further through addnl. weak I¡¤¡¤¡¤O or I¡¤¡¤¡¤aryl contacts. The different interactions lead to the formation of various assemblies with different dimensions in the solid state. The protonation of the reagents results in the formation of entirely different supramol. structures, which are supported by hydrogen bonding. The structural features of the reagents in the solid state reflect well their behavior in solution, and the I-C(R_F) bond is influenced by the coordination of Lewis basic solvents to the iodine atom and by hydrogen bonding with protic solvents. These solvent effects are more pronounced for reagents containing the trifluoromethyl fragment than for derivatives with longer R_F chains.

European Journal of Organic Chemistry published new progress about 1206-46-8. 1206-46-8 belongs to catalysis-chemistry, auxiliary class Organic Silicones, name is Trimethyl(perfluorophenyl)silane, and the molecular formula is C9H9F5Si, HPLC of Formula: 1206-46-8.

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

Beyerlein, Friederike published the artcileAutomated synthesis and purification of [¹⁸F]fluoro-[di-deutero]methyl tosylate, Related Products of catalysis-chemistry, the publication is Journal of Labelled Compounds and Radiopharmaceuticals (2013), 56(7), 360-363, database is CAplus and MEDLINE.

Automated synthetic procedures of [¹⁸F]fluoro-[di-deutero]methyl tosylate on a GE TRACERlab FX F-N module and a non-com. synthesis module have been developed. The syntheses included azeotropic drying of the [¹⁸F]fluoride, nucleophilic ¹⁸F-fluorination of bis(tosyloxy)-[di-deutero]methane, HPLC purification and subsequent formulation of the synthesized [¹⁸F]fluoro-[di-deutero]methyl tosylate (d₂-[¹⁸F]FMT) in organic solvents. Automation shortened the total synthesis time to 50 min, resulting in an average radiochem. yield of about 50% and high radiochem. purity (>98%). The possible application of this procedure to com. available synthesis modules might be of significance for the production of deuterated ¹⁸F-fluoromethylated imaging probes in the future. Copyright 2013 John Wiley & Sons, Ltd.

Journal of Labelled Compounds and Radiopharmaceuticals 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, Related Products of catalysis-chemistry.

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

Roncaglioni, A. published the artcileBinary classification models for endocrine disrupter effects mediated through the estrogen receptor, Category: catalysis-chemistry, the publication is SAR and QSAR in Environmental Research (2008), 19(7-8), 697-733, database is CAplus and MEDLINE.

Endocrine disrupters (EDs) form an interesting field of application attracting great attention in the recent years. They represent a number of exogenous substances interfering with the function of the endocrine system, including the interfering with developmental processes. In particular EDs are mentioned as substances requiring a more detailed control and specific authorization within REACH, the new European legislation on chems., together with other groups of chems. of particular concern. QSAR represents a challenging method to approach data gap which is foreseen by REACH. The aim of this study was to provide an insight into the use of QSAR models to address ED effects mediated through the estrogen receptor (ER). New predictive models were derived to assess estrogenicity for a very large and heterogeneous dataset of chem. compounds QSAR binary classifiers were developed based on different data mining techniques such as classification trees, decision forest, fuzzy logic, neural networks and support vector machines. The focus was given to multiple endpoints to better characterize the effects of EDs evaluating both binding (RBA) and transcriptional activity (RA). A possible combination of the models was also explored. A very good accuracy was reached for both RA and RBA models (higher than 80%).

SAR and QSAR in Environmental Research 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, Category: catalysis-chemistry.

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

Faller, J. W. published the artcileA new solvatochromic chelating agent, Quality Control of 1860-58-8, the publication is Analytica Chimica Acta (1965), 32(6), 586-9, database is CAplus.

cf. CA 59, 10744h; 62, 6597e. The preparations are described of a solvatochromic chelating agent, 2 – (4′-hydroxy-3′-methoxystyryl)-5-(8-hydroxy-5-quinaldylmethyl)-1-methyl-8-hydroxyquinolinium Cl (1 merocyanine) (I); I.H₂O m. 250¡ã (decomposition), by the piperidine catalyzed condensation of the N-Me derivative of bis(8-hydroxy-5-quinaldyl)methane with vanillin; and of a bifunctional chelating agent 5-(8-hydroxy-5-quinolylmethyl)-8-hydroxyquinaldine (II) (m. 219-20¡ã), following the methods of Fiedler (CA 57, 7227h) for similar compounds The effect of solvent polarity on the absorption spectra of I is shown. The principal maximum and the log ¦Å (molar absorptivities) of the following I solutions are: 0.1NHCl 325,414; 4.20, 4.46; 0.01N KOH 375, 478; 4.15, 4.50; 90% MeOH- 0.01N KOH 392, 514; 4.09, 4.57; 90% PrOH-, 397, 525; 4.13, 4.58; 90% iso-PrOH-, 400, 526; 4.15, 4.59; 90% Me₂CO-0.01N KOH 405, 530; 4.40, 4.66; PhCH₂OH (saturated with 0.01N KOH) 385, 545; 4.32, 4.06; CHCl₃ (saturated with 0.01N KOH) 389, 611; 4.74, 3.52; 30% C₅H₅N (III) -, 509; 4.58; 50% III -, 399, 527; 4.14, 4.57; 80% III-, 401, 530, 561; 4.38, 4.23, 4.23; 86% III-, 593; 3.95; 94% III-, 403, 605; 4.57, 3.91; and 98% III-0.01N KOH solvent, 609 m¦Ì; 3.89, resp. At low III concentrations, protons were removed only from the O atoms of the vanillylidene and 8-hydroxyquinaldyl groups, while at the higher (¡Ý80%) III concentrations the proton was also removed from the remaining OH. At pH 9, I formed red H₂O-insoluble, PhCH₂OH soluble chelates with Ni²⁺, Cu²⁺, Zn²⁺, Co²⁺, Mg²⁺, Al³⁺ and Fe³⁺; at pH 5, I gave orange compounds with Ni²⁺, Cu²⁺, Zn²⁺, and Co²⁺, with solubility similar to that of the red chelates. The PhCH₂OH/alk. aqueous I solubility ratio is ?60. The stoichiometric Cu-II₂ (containing 9.2% Cu) and Al-II₃ (containing 2.8% Al) were prepared as described by Hollingshead (Oxine and its Derivatives, London: Butterworths, 1954). The ir spectra of II, on KBr pellets, had OH and aromatic bands and strong maximum at 12.1, 12.8 and 14.1 ¦Ì. The principal uv maximum of II, and the resp. log ¦Å were: (in 0.1N HCl) 258, 4.94; 313, 3.62; 324, 3.61; and 371, 3.70; (in 0.1N NaOH) 258, 4.74; 344, 3.84; and 365 m¦Ì, 3.82.

Analytica Chimica Acta published new progress about 1860-58-8. 1860-58-8 belongs to catalysis-chemistry, auxiliary class Carboxylic acid,Benzene,Ether, name is 2-(3-(Benzyloxy)phenyl)acetic acid, and the molecular formula is C15H14O3, Quality Control of 1860-58-8.

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

Xu, Min published the artcileTrophic niche partitioning of five sympatric shark species in the tropical eastern Pacific Ocean revealed by multi-tissue fatty acid analysis, Recommanded Product: Docosahexaenoic Acid, the publication is Environmental Research (2022), 214(Part_1), 113828, database is CAplus and MEDLINE.

Fatty acid (FA) anal. of consumer tissues has recently shown utility in drawing further inferences about trophic niche dynamics of marine predators such as sharks. In this study, we examined liver, plasma, and muscle FAs in five coexisting pelagic sharks (blue (Prionace glauca), silky (Carcharhinus falciformis), bigeye thresher (Alopias superciliosus), pelagic thresher (Alopias pelagicus), and smooth hammerhead (Sphyrna zygaena)) inhabiting the tropical eastern Pacific Ocean. Results showed complex inter- and intra-individual and tissue variation among the five shark species. Based on multivariate anal. of the muscle FAs, P. glauca and C. falciformis have the largest FA niche widths, indicating diverse feeding habits or habitat isolation, whereas A. pelagicus and S. zygaena occupied a narrower niche width, reflecting increased trophic specialization. High percentages of muscle FA niche overlap indicated strong resource competition between S.zygaena and C. falciformis and a degree of dietary isolation by P. glauca. Interpretations of feeding ecol. differed based on the anal. of plasma FAs, which could be attributed to higher dietary FA turnover rates. The liver was deemed unsuitable to examine FA niche metrics based on high and unexplained intra-specific variance in liver FAs as well as the unique lipid metabolism in chondrichthyans. Overall, our multi-tissue approach revealed the magnitude of potential competitive interactions among coexisting tropical shark species. It also expanded our understanding of inter-tissue variability and best practices when using FA anal. to estimate trophic niche metrics of sharks.

Environmental Research 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 C19H21N3O3S, Recommanded Product: Docosahexaenoic Acid.

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

Lundgren, Rylan J. published the artcileA P,N-Ligand for Palladium-Catalyzed Ammonia Arylation: Coupling of Deactivated Aryl Chlorides, Chemoselective Arylations, and Room Temperature Reactions, HPLC of Formula: 1237588-12-3, the publication is Angewandte Chemie, International Edition (2010), 49(24), 4071-4074, S4071/1-S4071/99, database is CAplus and MEDLINE.

An air-stable P,N-ligand (I), that advances the scope and utility of palladium-catalyzed ammonia cross-coupling reactions, was developed. A variety of aryl chloride and aryl tosylate substrates can be coupled efficiently, most notably electron-rich species lacking ortho-substitution under a range of conditions. The unique preference for ammonia coupling when using Pd/I mixtures can be exploited in unprecedented chemoselective arylations, and for the first time, the room temperature palladium-catalyzed cross-coupling of ammonia has been achieved.

Angewandte Chemie, International Edition published new progress about 1237588-12-3. 1237588-12-3 belongs to catalysis-chemistry, auxiliary class Mono-phosphine Ligands, name is 4-(2-(Di(adamantan-1-yl)phosphino)phenyl)morpholine, and the molecular formula is C30H42NOP, HPLC of Formula: 1237588-12-3.

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

Asquith, Raymond S. published the artcileThe fading of nitrodiphenylamine disperse dyes in relation to their structure and ultraviolet absorption spectra, Recommanded Product: Bis(4-nitrophenyl)amine, the publication is Journal of the Society of Dyers and Colourists (1968), 84(10), 507-10, database is CAplus.

A series of dinitrodiphenylamines was prepared by heating the appropriate BrC6H4NO2 with the O2NC6H4NHAc for 16 hrs. at 180¡ãC. in the presence of anhydrous K2CO3 and CuBr. The absorption spectra in the range 200-560 nm. were recorded for all of the purified dyes (25 ¡Á 10-6M) in absolute alc. All showed maximum in the 370-430 nm. region. Each dye was ground in a ball mill for 24 hrs. with H2O and a 10% solution of Dispersol VL. A 1% dyeing on secondary cellulose acetate was prepared Samples of the dyed material were exposed in a Xenotest 450 fading lamp at 30¡ã and 45% relative humidity. Exposure was continued until Blue Standard 7 had just started to fade (about 102 hrs.). All dyes darkened in color, turned brown, and then faded to a lighter color.

Journal of the Society of Dyers and Colourists 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