Month: December 2022

Pieber, Bartholomaeus published the artcileContinuous heterogeneous photocatalysis in serial micro-batch reactors, SDS of cas: 1798-04-5, the publication is Angewandte Chemie, International Edition (2018), 57(31), 9976-9979, database is CAplus and MEDLINE.

Solid reagents, leaching catalysts, and heterogeneous photocatalysts are commonly employed in batch processes but are ill-suited for continuous-flow chem. Heterogeneous catalysts for thermal reactions are typically used in packed-bed reactors, which cannot be penetrated by light and thus are not suitable for photocatalytic reactions involving solids. We demonstrate that serial micro-batch reactors (SMBRs) allow for the continuous utilization of solid materials together with liquids and gases in flow. This technol. was utilized to develop selective and efficient fluorination reactions using a modified graphitic carbon nitride heterogeneous catalyst instead of costly homogeneous metal polypyridyl complexes. The merger of this inexpensive, recyclable catalyst and the SMBR approach enables sustainable and scalable photocatalysis.

Angewandte Chemie, International Edition 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, SDS of cas: 1798-04-5.

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

Roeder, F. published the artcileTHz generation by optical rectification of intense near-infrared pulses in organic crystal BNA, Quality Control of 201157-13-3, the publication is Optics Express (2020), 28(24), 36274-36285, database is CAplus and MEDLINE.

Generation of terahertz radiation by optical rectification of intense near-IR laser pulses in N-benzyl-2-methyl-4-nitroaniline (BNA) is investigated in detail by carrying out a complete characterization of the terahertz radiation. We studied the scaling of THz yield with pump pulse repetition rate and fluence which enabled us to predict the optimal operating conditions for BNA crystals at room temperature for 800 nm pump wavelength. Furthermore, recording the transmitted laser spectrum allowed us to calculate the nonlinear refractive index of BNA at 800 nm.

Optics Express 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, Quality Control of 201157-13-3.

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

Bhaskar Reddy, Manda published the artcileDesign and synthesis of Tr?ger’s base ditopic receptors: host-guest interactions, a combined theoretical and experimental study, SDS of cas: 10517-44-9, the publication is Organic & Biomolecular Chemistry (2015), 13(4), 1141-1149, database is CAplus and MEDLINE.

Two flexible Troeger base ditopic receptors C4TB and C5TB incorporating an aza-crown ether were designed and synthesized for bis[ammonium ion] complexation. A comprehensive study of host-guest interactions was established by ¹H NMR spectroscopy and DFT calculations Bis[ammonium chloride] with a short alkyl chain spacer showed the highest affinity for the receptors. M06-2X/cc-pVTZ calculations including the solvent effects on host-guest complexes were employed to explain and rationalize the exptl. trends. The short N-H¡¤¡¤¡¤O or N-H¡¤¡¤¡¤N hydrogen-bond distances observed in the range of 1.71-1.98 ? indicate the existence of a strong charge assisted hydrogen bonding between the host and the guest. The unusual behavior (higher binding constant) of A5 in ¹H NMR titration is traced to the conformational folding of the guest. The synthesis of the target compounds was achieved by a reaction of 1,4,7-trioxa-10-azacyclododecane and 1,4,7,10-tetraoxa-13-azacyclopentadecane with a bis(bromoethoxy)6H,12H-5,11-Methanodibenzo[b,f][1,5]diazocine derivative (Troger’s base).

Organic & Biomolecular Chemistry published new progress about 10517-44-9. 10517-44-9 belongs to catalysis-chemistry, auxiliary class Salt,Amine,Aliphatic hydrocarbon chain, name is Propane-1,3-diamine dihydrochloride, and the molecular formula is C3H12Cl2N2, SDS of cas: 10517-44-9.

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

Etefagh, R. published the artcileEffect of Zn doping on optical properties and photoconductivity of SnS₂ nanocrystalline thin films, SDS of cas: 6972-05-0, the publication is Bulletin of Materials Science (2013), 36(3), 411-416, database is CAplus.

Zn-doped SnS₂ thin films have been deposited simply by spray pyrolysis technique. The doping level was changed from [Zn/Sn] = 0 to 7.5 at%. The films were characterized by x-ray diffraction, STM, energy dispersive x-ray anal. (EDX), photoluminescence, and UV-vis spectroscopy. XRD patterns of the films with different zinc contents show that all samples have polycrystalline structure with Berndtite dominant phase and preferred orientation of (001) growth plane. Zn insertion causes a significant decrease in grain size. Optical bandgap of the films were calculated for different dopant concentrations and they lie in the region of 2.3-2.7 eV. Surprisingly, regardless of doping level, the luminescent properties of films are related to the fundamental bandgap energy and deep levels inside the bandgap. Photoconductivity of the films were measured under visible light. Sensitivity to the light increases by zinc incorporation, which was a large amount for SnS₂:Zn of 7.5%.

Bulletin of Materials Science 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 C3H8N2S, SDS of cas: 6972-05-0.

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

Khan, Sadiq Noor published the artcilePeptide conjugates of 18¦Â-glycyrrhetinic acid as potent inhibitors of ¦Á-glucosidase and AGEs-induced oxidation, SDS of cas: 71989-31-6, the publication is European Journal of Pharmaceutical Sciences (2022), 106045, database is CAplus and MEDLINE.

18¦Â-Glycyrrhetinic acid (18¦Â-GA) is known for several biol. activities, and has been the focus of extensive research for the development of therapeutic agents. In the current study, 18¦Â-GA-peptide conjugates 2-11 were evaluated for their in vitro ¦Á-glucosidase inhibitory and antiglycation activities. Structure-activity relationship (SAR) established and mol. interactions of active bioconjugates with the enzyme¡äs binding sites were predicted through mol. modeling approach. In tripeptide moiety of conjugates 2-11, peptide residue at position 1 was found to have a significant role on ¦Á-glucosidase inhibition. The most active 18¦Â-GA-peptide conjugates 5 (18¦Â-GA-Cys¹-Tyr²-Gly³), and 8 (18¦Â-GA-Pro¹-Tyr²-Gly³) exhibited several-fold potent ¦Á-glucosidase inhibition (IC₅₀ values 20-28 ¦¬M), as compared to standard drug acarbose (IC₅₀ = 875.8 ¡À 2.10 ¦¬M). Kinetic studies of potent compounds, 4-8 revealed that conjugate 5 exhibits competitive-type of inhibition, while conjugates 6-8 showed a non-competitive type of inhibition. The simulation studies also supported the kinetic results that conjugate 5 (18¦Â-GA-Cys¹-Tyr²-Gly³) inhibits the ¦Á-glucosidase enzyme by blocking its substrate binding site. AGEs-induced NO? inhibitors play an important role in controlling the inflammation associated with diabetes mellitus. The peptide conjugates 2-11 were also evaluated in vitro for AGEs-induced NO? inhibition using RAW 264.7 macrophage cell line. Our data revealed that conjugates 7-10 were the more potent AGEs-induced NO? inhibitors, comparable to standards rutin, and PDTC. The peptide conjugate 5 (a competitive inhibitor of ¦Á-glucosidase) also exhibited a strong inhibitory activity against AGEs-induced NO? production Furthermore, peptide conjugates 2-11 were found non-cytotoxic to mouse fibroblast NIH-3T3, and murine macrophages RAW 264.7 cell lines. In conclusion, our data demonstrates that besides possessing strong ¦Á-glucosidase inhibition, the newly synthesized peptide conjugates also alleviated the AGEs-induced NO? production in RAW macrophages. Dual inhibition of ¦Á-glucosidase enzyme, and AGEs-induced NO? production by 18¦Â-GA-peptide conjugates qualify them for further research in anti-diabetic drug discovery.

European Journal of Pharmaceutical Sciences published new progress about 71989-31-6. 71989-31-6 belongs to catalysis-chemistry, auxiliary class Amino acide derivatives,pyrrolidine, name is Fmoc-Pro-OH, and the molecular formula is C20H19NO4, SDS of cas: 71989-31-6.

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

Purohit, D. M. published the artcileSynthesis of 1,1,1-trichloro-2,2-bis(carboxymethoxyaryl)ethanes as potential antimicrobial and insecticidal agents, HPLC of Formula: 5411-14-3, the publication is Indian Journal of Chemistry, Section B: Organic Chemistry Including Medicinal Chemistry (1999), 38B(5), 618-622, database is CAplus.

Some new 1,1,1-trichloro-2,2-bis(carboxymethoxyaryl)ethanes have been synthesized by treating aryloxyacetic acids (2 mol) with chloral hydrate (1 mol) in the presence of a catalytic amount of concentrated sulfuric acid. The aryloxyacetic acids are prepared by reaction of phenols with chloroacetic acid in the presence of aqueous sodium hydroxide. The antimicrobial activities of these compounds have been assayed against Gram pos. and Gram neg. bacteria and fungi; insecticidal activities have been examined against the rice leaf hopper.

Indian Journal of Chemistry, Section B: Organic Chemistry Including Medicinal Chemistry 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 C10H10O6, HPLC of Formula: 5411-14-3.

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

Purohit, D. M. published the artcileSynthesis of 1,1,1-trichloro-2-(2′,4′-dichloro-5′-carboxymethoxyphenyl)-2-(carboxyaryl/carboxymethoxyaryl)ethanes as possible antimicrobial agents, Recommanded Product: 2,2-(1,2-Phenylenebis(oxy))diacetic acid, the publication is Indian Journal of Heterocyclic Chemistry (1999), 8(3), 209-212, database is CAplus.

The title compounds I (R = HO₂C, HO₂CCH:CH, HO₂CCH₂, HO₂CCH₂O; R¹ = H, HO₂C, Me, Cl, MeO, NO₂, HO₂CCH₂O) were prepared by reaction of 2,4-Cl₂C₆H₃OCH₂CO₂H with chloral hydrate in the presence of concentrated H₂SO₄ to afford the (trichloroethyl)phenoxyacetic acid II. II reacted with RR¹C₆H₄ in the presence of a catalytic amount of concentrated H₂SO₄ to give I. All products were screened for antimicrobial activity. The mol. structures of the products were supported by IR, PMR, and mass spectroscopy and elemental anal.

Indian Journal of Heterocyclic Chemistry 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 C10H10O6, Recommanded Product: 2,2-(1,2-Phenylenebis(oxy))diacetic acid.

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

Schaetti, J. published the artcileTailoring the volatility and stability of oligopeptides, Related Products of catalysis-chemistry, the publication is Journal of Mass Spectrometry (2017), 52(8), 550-556, database is CAplus and MEDLINE.

Amino acids are essential building blocks of life, and fluorinated derivatives have gained interest in chem. and medicine. Modern mass spectrometry has enabled the study of oligo- and polypeptides as isolated entities in the gas phase, but predominantly as singly or even multiply charged species. While laser desorption of neutral peptides into adiabatically expanding supersonic noble gas jets is possible, UV-VIS spectroscopy, elec. or magnetic deflectometry as well as quantum interferometry would profit from the possibility to prepare thermally slow mol. beams. This has typically been precluded by the fragility of the peptide bond and the fact that a peptide would rather ‘fry’, i.e. denature and fragment than ‘fly’. Here, we explore how tailored perfluoroalkyl functionalization can reduce the intermol. binding and thus increase the volatility of peptides and compare it to previously explored methylation, acylation and amidation of peptides. We show that this strategy is essential and enables the formation of thermal beams of intact neutral tripeptides, whereas only fragments were observed for an extensively fluoroalkyl-decorated nonapeptide.

Journal of Mass Spectrometry published new progress about 30670-30-5. 30670-30-5 belongs to catalysis-chemistry, auxiliary class Polyfluoroalkanes, name is 3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,10-Heptadecafluorodecan-1-amine, and the molecular formula is C10H6F17N, Related Products of catalysis-chemistry.

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

Limmer, Matt A. published the artcileAltering the localization and toxicity of arsenic in rice grain, Name: (S)-2-Amino-4-(methylthio)butanoic acid, the publication is Scientific Reports (2022), 12(1), 5210, database is CAplus and MEDLINE.

Abstract: Previous work has shown that inorganic As localizes in rice bran whereas DMA localizes in the endosperm, but less is known about co-localization of As and S species and how they are affected by growing conditions. We used high-resolution synchrotron X-ray fluorescence imaging to image As and S species in rice grain from plants grown to maturity in soil (field and pot) and hydroponically (DMA or arsenite dosed) at field-relevant As concentrations In hydroponics, arsenite was localized in the ovular vascular trace (OVT) and the bran while DMA permeated the endosperm and was absent from the OVT in all grains analyzed, and As species had no affect on S species. In pot studies, soil amended with Si-rich rice husk with higher DMA shifted grain As into the endosperm for both japonica and indica ecotypes. In field-grown rice from low-As soil, As localized in the OVT as arsenite glutathione, arsenite, and DMA. Circumferential model of grain filling for arsenite and DMA and show Si-rich soil amendments alter grain As localization, potentially lessening risk to rice consumers.

Scientific Reports 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, Name: (S)-2-Amino-4-(methylthio)butanoic acid.

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

Filippov, L. O. published the artcileMechanism of starch adsorption on Fe-Mg-Al-bearing amphiboles, Synthetic Route of 2016-56-0, the publication is International Journal of Mineral Processing (2013), 120-128, database is CAplus.

The specific affinity of iron minerals for starch has been successfully exploited in the selective flocculation and flotation of iron ores. The same phenomenon complicates the flotation separation between iron oxides, i.e., magnetite and Fe-Mg-Al-bearing silicates. Adsorption isotherms were constructed, and the mechanisms of the adsorption of starch on quartz, magnetite and Fe-Mg-Al-bearing amphibole pargasite were discussed in this paper. The nature of the species adsorbed on minerals was determined by DRIFT and XPS spectroscopy. The flotation behavior of magnetite and silicates at pH 10 upon stirring in a starch solution was demonstrated. The adsorption and DRIFT study results concluded that starch is adsorbed both on quartz and amphiboles. However, the starch adsorption mechanism based on the chem. complexation is proposed to explain the strong depression effect of the starch during the magnetite and Fe-Mg-Al-bearing amphibole flotation with an amine compared with quartz.

International Journal of Mineral Processing published new progress about 2016-56-0. 2016-56-0 belongs to catalysis-chemistry, auxiliary class Active Esterification, name is Dodecylamineacetate, and the molecular formula is C14H31NO2, Synthetic Route of 2016-56-0.

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