Catalysis-chemistry

Hankin, Danielle M. published the artcile¦Ç²-Sulfenamido and -selenamido complexes of titanium, zirconium, molybdenum and tungsten, Synthetic Route of 19117-31-8, the publication is Journal of the Chemical Society, Dalton Transactions: Inorganic Chemistry (1996), 1309-21, database is CAplus.

The interaction of TiCl₄ with LiN(Bu^t)SR (R = Ph or C₆H₂Me₃-2,4,6) gave the sulfenamido complexes TiCl₂(¦Ç²-Bu^tNSR)₂. Interaction of ZrCl₄ with 3 equiv of LiN(Bu^t)SPh produced ZrCl(¦Ç²-Bu^tNSPh)₃ while ZrCl₄(tht)₂ (tht = tetrahydrothiophene) with 5 equiv gave the homoleptic Zr(¦Ç²-Bu^tNSPh)₄. From ZrCl₂(¦Ç⁵-C₅H₅)₂ only ZrCl(¦Ç⁵-C₅H₅)₂(¦Ç²-Bu^tNSPh) was obtained. Using as starting materials MO₂Cl₂(dme) (dme = 1,2-dimethoxyethane, M = Mo or W), MoCl₂(NBu^t)₂ and WCl₂(NBu^t)₂(py)₂, interactions with LiNBu^tSPh gave ¦Ç²-sulfenamido compounds such as MoO₂(¦Ç²-Bu^tNSPh)₂. The Se analog of the W compound, i.e. W(NBu^t)₂(¦Ç²-Bu^tNSePh)₂ was made by interaction of Li₂W(NBu^t)₄ with PhSeBr. Where study was possible, NMR spectra over a temperature range indicate that invertomers and isomers occur. Six compounds were structurally characterized by x-ray diffraction. In all case the sulfenamido ligands are ¦Ç² bonded and the geometry about the N atoms is planar.

Journal of the Chemical Society, Dalton Transactions: Inorganic Chemistry published new progress about 19117-31-8. 19117-31-8 belongs to catalysis-chemistry, auxiliary class Oxidant, name is N-(tert-Butyl)-S-phenylthiohydroxylamine, and the molecular formula is C10H15NS, Synthetic Route of 19117-31-8.

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

Tadros, Joseph published the artcileA Comparison of Immobilised Triphenylphosphine and 1-Hydroxybenzotriazole as Mediators of Catch-and-Release Acylation Under Flow Conditions, Safety of 2-Methylbenzoic acid, the publication is Chemistry – An Asian Journal (2022), 17(5), e202101308, database is CAplus and MEDLINE.

Herein, a comparative study of immobilized triphenylphosphine (PS-PPh₃) and 1-hydroxybenzotriazole (PS-HOBt) to mediate amide couplings under continuous flow was described. Compared to Appel-type amidations (PS-PPh₃), the developed ‘catch-and-release’ approach (PS-HOBt) afforded near-quant. amide conversions. Utilizing this strategy, sulfonyl chloride amenability enabled facile access to an expanded library of sulfonate and sulfonamides. Post-constructional peptide modification was also demonstrated, affording two N¦Â-functionalized pentapeptides in high yields and purities. In contrast to frequently utilized coupling agents, the PS-HOBt resin could be recycled six times without a reduction in efficacy or regeneration requirements.

Chemistry – An Asian Journal 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 C15H21BO3, Safety of 2-Methylbenzoic acid.

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

Ozalp, Lalehan published the artcileInvestigation of HMG-CoA reductase inhibitory and antioxidant effects of various hydroxycoumarin derivatives, HPLC of Formula: 104-03-0, the publication is Archiv der Pharmazie (Weinheim, Germany) (2020), 353(10), 1900378, database is CAplus and MEDLINE.

Cardiovascular diseases are one of the primary causes of deaths worldwide, and the development of atherosclerosis is closely related to hypercholesterolemia. As the reduction of the low-d. lipoprotein cholesterol level is critical for treating these diseases, the inhibition of 3-hydroxy-3-methyl-glutaryl CoA (HMG-CoA) reductase, which is essentially responsible for cholesterol biosynthesis, stands out as a key solution to lower plasma cholesterol levels. In this study, we synthesized several dihydroxycoumarins and investigated their antioxidant and in vitro HMG-CoA reductase inhibitory effects. Furthermore, we carried out in silico studies and examined the quantum-chem. properties of the coumarin derivatives We also performed mol. docking experiments and analyzed the binding strength of each coumarin derivative Our results revealed that compound IV(I) displayed the highest HMG-CoA reductase inhibitory activity (IC₅₀ = 42.0 ¦ÌM) in vitro. Cupric-reducing antioxidant capacity and ferric-reducing antioxidant power assays demonstrated that coumarin derivatives exhibit potent antioxidant activities. Addnl., a close relationship was found between the LUMO energy levels and the antioxidant activities.

Archiv der Pharmazie (Weinheim, Germany) 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, HPLC of Formula: 104-03-0.

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

Lokeshkumar, Venugopal published the artcileNutritive evaluations of laboratory-reared edible field cricket Coiblemmus compactus Chopard, 1928 (Orthoptera: Gryllidae), for utilising them as an alternate protein source, Recommanded Product: (S)-2-Amino-4-(methylthio)butanoic acid, the publication is Journal of Basic & Applied Zoology (2022), 83(1), 26, database is CAplus.

The increasing world population has made researchers to explore and validate alternate food sources for the future; in that regard, due to the attractive nutritive profile, edible insects ensure the food and feed security in some developing countries. Crickets are orthopteran edible insects widely eaten around the world not as an emergency food but as a delicacy. This present study aims to stabilize a mass rearing technique of field cricket Coiblemmus compactus using cost-effective rearing medium and feed materials. The reared adult crickets were processed and analyzed for its proximate, mineral, amino acid, fatty acid and energy contents. The cost-effective rearing methods were standardised for the cricket species, and the obtained nutritive values were comparatively higher than other edible meat sources. The cricket Coiblemmus compactus had 50.2 ¡À 0.37, 26.50 ¡À 0.80, 8.20 ¡À 1.61, 5.50 ¡À 0.48, 10.93 ¡À 0.19 and 5.40 ¡À 0.16 g/100 g of crude protein, crude fat, carbohydrate, crude fiber, moisture and ash contents, resp. The cricket also possessed higher amounts of potassium (897.83 ¡À 1.55 mg/100 g) and phosphorous elements (604.66 ¡À 4.11 mg/100 g) with 458.30 ¡À 0.29 kcal/100 g of energy content. The chromatog. studies showed the abundance of amino acid and fatty acid contents in the reared edible cricket. The attractive and high-protein nutritive profile of edible cricket Coiblemmus compcatus makes itself an alternate food and feed material to elevate food crisis in developing countries.

Journal of Basic & Applied Zoology 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, Recommanded Product: (S)-2-Amino-4-(methylthio)butanoic acid.

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

Pu, Xiaoying published the artcileSelective capture of mercury(II) in aqueous media using nanoporous diatomite modified by allyl thiourea, Category: catalysis-chemistry, the publication is Journal of Materials Science (2022), 57(20), 9246-9264, database is CAplus.

We herein aim to construct a novel sorbent (DT-S) possessing adsorption selectivity to mercury(II) in aqueous media. Silanized purified diatomite (DT-N) was first synthesized by grafting 3-aminopropyltrimethoxysilane (APS) onto purified diatomite (DT). Nanoporous DT-S was then constructed through successively grafting epichlorohydrin (ECH) and allyl thiourea (AT) onto DT-N. FTIR, elemental anal. (EA), Brunauer-Emmett-Teller (BET), XRD, SEM, and pH at the zero point of charge (pH_zpc) results demonstrated that DT-S had ample -OH, -NH₂, and C=S, sp. surface area of 5.52 m²/g, small pore diameter (16.10 nm), porous structures, and pH_zpc of 5.80, favorable for Hg(II) capture. Optimal adsorption parameters were determined through batch tests. Capture behavior was interpreted preferably by pseudo-second-order kinetic and Liu isothermal equations. DT-S¡ä capture features, e.g., monolayer, spontaneity, chemisorption, and endothermic reaction, were evidenced by the data obtained. DT-S had 56.30 mg/g of maximum adsorption capacity for Hg(II), exceeded some sorbents available. Competitive adsorption tests displayed remarkably selective ability to capture Hg(II) (> 80.01%). FTIR and XRD analyses validated a possible capture mechanism, i.e., chelation reactions took place between mercury ions and nitrogen, oxygen, or sulfur atom in solid-liquid interface. Altogether, DT-S with high removal efficiency, capture selectivity, and excellent reusability is expected to be new sorbent applied to Hg(II)-contaminated water purification

Journal of Materials 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, Category: catalysis-chemistry.

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

Venkatesan, Gopalakrishnan published the artcileFacile synthesis of oligo anilines as permanent hair dyes: how chemical modifications impart colour and avoid toxicity, SDS of cas: 1821-27-8, the publication is New Journal of Chemistry (2019), 43(41), 16188-16199, database is CAplus.

Many dyes for long-lasting hair coloring contain aromatic amines that undergo oxidative polymerizations, resulting in allergic contact dermatitis, with the potential to develop serious toxic effects. Among these amines, para-phenylenediamine (PPD) is a small mol. form of aniline commonly used in beauty products despite being a known allergen to humans. Hence, in this study we designed and synthesized safer PPD analogs through the synthesis of oligomeric PPD and the introduction of bulky side chains on PPD to overcome the PPD dye’s toxicity. We hypothesized that (a) an increase in the mol. size of PPD by addition of the PPD monomer unit on free amines and (b) strategic functionalizations at the ortho position of PPD with strong electron-donating bulky groups are able to maintain the hair coloring properties, and increase the resistance to binding to skin proteins and therefore decrease the chance of skin sensitization. 13 Oligomers were synthesized, with the aim to produce safer hair dyes while minimizing eventual toxicity to humans. In particular, oligomers with bulky sidechains, PPD 6 (13), PPD 7 (14) and PPD 8 (15), displayed weak-to-moderate (27.1%, 24.1% and 34.0%) sensitization potential. The results confirmed the importance of having bulky and strong electron donating O-alkyl substituents in order to decrease the reactivity of PPD analogs towards skin proteins, thus preventing the interaction with immune cells and providing safer hair dyes.

New Journal of Chemistry 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 C7H9BN2O3, SDS of cas: 1821-27-8.

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

Damrauer, Robert published the artcilePreparation and NMR studies of pentacoordinated silicon anions, Related Products of catalysis-chemistry, the publication is Organometallics (1986), 5(7), 1490-4, database is CAplus.

The 18-crown-6 potassium salts of trifluorodiphenylsiliconate, trifluoromethylphenylsiliconate, tetrafluorophenylsiliconate, and difluorotriphenylsiliconate were prepared These are remarkably stable and nonhygroscopic. Each were studied by variable-temperature ¹H and ¹⁹F NMR spectroscopy. The dynamic behavior was discussed.

Organometallics published new progress about 312-40-3. 312-40-3 belongs to catalysis-chemistry, auxiliary class Organic Silicones, name is Difluorodiphenylsilane, and the molecular formula is C12H10F2Si, Related Products of catalysis-chemistry.

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

Dutta, Soham published the artcileKinetics and Hazards of 4-Vinylbenzyl Chloride Storage and Thermal Decomposition of Di-4-methylbenzoyl Peroxide by DSC and TAM, Category: catalysis-chemistry, the publication is Organic Process Research & Development (2021), 25(9), 2133-2145, database is CAplus.

Thermal hazard assessments in process industries often require calorimetry and kinetic modeling. These techniques are illustrated using examples of inhibited 4-vinylbenzyl chloride (VBC) self-polymerization and di-4-methylbenzoyl peroxide (MeBPO) thermal stability. The polymerization kinetics of inhibited VBC were studied using isothermal and non-isothermal calorimetry. A thermokinetic model was developed using calorimetry data and this model was coupled with a heat balance to predict the consequence of a commonly encountered plant scenario, loss of active cooling to a storage tank. Isothermal differential scanning calorimetry (DSC) and microcalorimetry (using a TAM IV microcalorimeter) were also applied to analyze the thermal decomposition of MeBPO desensitized with silicone oil (50% weight/weight). The thermokinetic parameters and thermal stability were evaluated. MeBPO decomposes in two exothermic reactions, and the total heat of decomposition was determined to be 658.8 J/g of sample. The thermal decomposition of MeBPO was described by a model of two parallel reactions, the first leading to 4,4′-dimethylbiphenyl and the second to p-methylbenzyl p-toluate. The results can be applied for emergency relief system design and for emergency rescue strategies during an upset or accident.

Organic Process Research & Development 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, Category: catalysis-chemistry.

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

Ahonen, Eija published the artcileOxidative stability, oxidation pattern and alpha-tocopherol response of docosahexaenoic acid (DHA, 22:6n-3)-containing triacylglycerols and ethyl esters, Synthetic Route of 6217-54-5, the publication is Food Chemistry (2022), 132882, database is CAplus and MEDLINE.

DHA is most often used in supplements either in its triacylglycerol or Et ester form. Currently, there is only little published data on the differences in the oxidative stability and ¦Á-tocopherol response between the two lipid structures, as well as on the oxidation patterns of pure DHA. This study investigated the oxidative stability, ¦Á-tocopherol response and oxidation pattern of DHA incorporated in triacylglycerols and as Et esters with an untargeted approach after oxidation at 50 ¡ãC in the dark. Liquid and gas chromatog. methods with mass spectrometric detection and NMR spectroscopy were applied. DHA was more stable in triacylglycerols than as Et esters without ¦Á-tocopherol addition With ¦Á-tocopherol added the opposite was observed The oxidation products formed during triacylglycerol and Et ester oil oxidation were mostly similar, but also some structure-related differences were detected in both volatile and non-volatile oxidation products.

Food Chemistry 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, Synthetic Route of 6217-54-5.

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

Zlatkovic, Dragan published the artcileA novel pathway for the thermolysis of N-nitrosoanthranilates using flash vacuum pyrolysis leading to 7-aminophthalides, SDS of cas: 119-80-2, the publication is Organic & Biomolecular Chemistry (2020), 18(41), 8371-8375, database is CAplus and MEDLINE.

Flash vacuum pyrolysis of Me N-methyl-N-nitrosoanthranilate leads to elimination of nitric oxide and disproportionation of the formed N-radical to 7-(methylamino)phthalide and Me N-methylanthranilate. This transformation is a convenient, solvent-free method for the preparation of 7-(methylamino)phthalides. An alternative route through pyrolysis of N-benzyl-N-Me anthranilates was also studied.

Organic & Biomolecular Chemistry 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 C8H14O4, SDS of cas: 119-80-2.

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