Catalysis-chemistry

Morris, David T. J. published the artcileA molecular communication channel consisting of a single reversible chain of hydrogen bonds in a conformationally flexible oligomer, Category: catalysis-chemistry, the publication is Chem (2021), 7(9), 2460-2472, database is CAplus and MEDLINE.

Communication of information through the global switching of conformation in synthetic mols. has hitherto entailed the inversion of chirality. Here, we report a class of oligomer through which information may be communicated through a global reversal of polarity. Ethylene-bridged oligoureas are constitutionally sym., conformationally flexible mols. organized by a single chain of hydrogen bonds running the full length of the oligomer. NMR reveals that this hydrogen-bonded chain may undergo a coherent reversal of directionality. The directional uniformity of the hydrogen-bond chain allows it to act as a channel for the spatial communication of information on a mol. scale. A binding site at the terminus of an oligomer detects local information about changes in pH or anion concentration and transmits that information-in the form of a directionality switch in the hydrogen-bond chain-to a remote polarity-sensitive fluorophore. This propagation of polarity-encoded information provides a new mechanism for mol. communication.

Chem 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, Category: catalysis-chemistry.

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

de Kruijff, Goswinus H. M. published the artcileElectrochemical Synthesis of Aryl Methoxymethyl Ethers, Application In Synthesis of 1798-04-5, the publication is ChemElectroChem (2019), 6(16), 4180-4183, database is CAplus.

Methoxymethyl protected phenols/thiophenols ArXCH₂OCH₃ [X = O, S; Ar = Ph, 4-ClC₆H₄, 2,6-di-ClC₆H₃, etc.] were synthesized by safe, reagent- and reagent waste-free anodic decarboxylation protocol. High current efficiencies and good functional group tolerance made this methodol. a useful tool for the preparation of these valuable and protected phenol building blocks.

ChemElectroChem 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, Application In Synthesis of 1798-04-5.

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

Haroon, Haamid published the artcileMetal-Organic Framework-Derived p-Type Cu₃P/Hexagonal Boron Nitride Nanostructures for Photocatalytic Oxidative Coupling of Aryl Halides to Biphenyl Derivatives, Related Products of catalysis-chemistry, the publication is ACS Applied Nano Materials (2022), 5(2), 2006-2017, database is CAplus.

The C-C coupling is an efficient route toward the synthesis of sym. biphenyls from aryl halides. Herein, a cost-effective visible nanophotocatalyst system (Cu₃P/hBN), consisting of heterogeneous, nanoporous, and nanosized Cu₃P (derived from HKUST MOF) and hexagonal boron nitride (hBN), is employed for the photocatalytic coupling of aryl halides. The catalyst efficiently executes the aryl halide coupling to biphenyls under visible light and in the presence of air at room temperature The electron/hole pairs can be readily generated upon visible light excitation of the Cu₃P nanophotocatalyst, but the low band gap of Cu₃P promotes the fast recombination of generated electrons/holes, thereby rendering Cu₃P inefficient for photocatalysis. However, the association of a small amount of hBN, which is a structural analog of graphene and carbon nitride, with Cu₃P to form the Cu₃P/hBN composite promotes the separation of electrons as hBN can provide its surface to the excited electrons of Cu₃P, making them active to act on surface-adsorbed active reactant mols., whereas the holes remain confined to the valence band of Cu₃P. Cu₃P is a P-type semiconductor that provides Cu (+1) active sites that change to Cu (+2) during the photocatalytic cycle. The oxidized active sites consisting of Cu (+2) promote further enhancement of electrostatic interactions between the catalyst and the attached aromatic halide mols. The excited electrons generated in the catalyst upon light exposure act on oxygen mols. to further lead to superoxide radical anion (O₂^-?) radical formation. The formed O₂^-? radicals then act on activated halide mols. and convert them to biphenyls.

ACS Applied Nano Materials 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, Related Products of catalysis-chemistry.

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

Bhat, Sajad published the artcileSuitably Band-aligned MOF-Derived Ni₂P/MnO₂ Heterostructure with Ni(I) Coordination Surface Sites for Self-Coupling of Aryl Halides to Biaryls, Formula: C14H14, the publication is Chemistry – An Asian Journal (2022), 17(4), e202101279, database is CAplus and MEDLINE.

An efficient photo-redox strategy for the aryl-aryl self-coupling of aryl halides through a heterogeneous catalysis route has been demonstrated. A coordinatively unsaturated Ni₂P surface with the enhanced photochem. property upon hetero-structuring with ¦Ä-MnO₂ affects the organic transformation to biaryls with impressive yield and photo-conversion efficiency. The dual-role of the Ni₂P catalyst with its participation as the catalytic active surface and the photo-redox center distinguishes the organic transformation achieved herein with other catalytic and photocatalytic aryl-aryl self-coupling.

Chemistry – An Asian Journal 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, Formula: C14H14.

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

Iovkova, Ljuba published the artcilepara-functionalized aryl-di-tert-butylfluorosilanes as potential labeling synthons for ¹⁸F radiopharmaceuticals, Safety of Tetrabutylammonium hydrogencarbonate, the publication is Chemistry – A European Journal (2009), 15(9), 2140-2147, database is CAplus and MEDLINE.

The syntheses of the functionalized triorganofluorosilanes tBu₂-(p-XC₆H₄)SiF (3a, X = SH; 4a, X = NCS; 4b, X = NCO; 5, X = NC₄H₂O₂; 7, X = COOH; 8a, X = COONC₄H₄O₂; 8b, X = COOC₆F₅) are reported. These compounds display potential as silicon-based fluoride acceptors (SiFAs). The mol. structures of compounds 5, 7, and 8a have been determined by single-crystal X-ray diffraction studies. With the exception of compounds 8a and 8b, all of the compounds could be ¹⁸F-labeled by isotopic exchange in good to high radiochem. yields (RCY) with good to excellent specific activities. As proof of applicability, the maleimido-functionalized SiFA derivative 5, which is specific for thiol groups, has been used for the labeling of rat serum albumin (RSA) that had been derivatized with 2-iminothiolane. The incorporation of [¹⁸F]5 into the derivatized RSA reached a maximum yield after 30 min at ambient temperature After purification, the [¹⁸F]RSA was evaluated in a healthy rat by means of ¦ÌPET and displayed an expedient in vivo stability over 180 min.

Chemistry – A European Journal 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, Safety of Tetrabutylammonium hydrogencarbonate.

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

Toyota, Masahiro published the artcileSimple design for the construction of complex gibberellin framework – stereoselective synthesis of a possible key intermediate to GA₁₂ via Pd²⁺-promoted cycloalkenylation reaction, Related Products of catalysis-chemistry, the publication is Tetrahedron (1995), 51(25), 6927-40, database is CAplus.

A successful design for the construction of C₂₀ gibberellin framework has been described. The key features of the synthesis are a Pd²⁺-promoted cycloalkenylation reaction and an intramol. Diels-Alder reaction, giving the intermediate I.

Tetrahedron 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 C14H17FN4O3, Related Products of catalysis-chemistry.

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

Milosavljevic, Milutin M. published the artcileOptimization of the synthesis of N-alkyl and N,N-dialkyl thioureas from waste water containing ammonium thiocyanate, Computed Properties of 6972-05-0, the publication is Chemical Industry & Chemical Engineering Quarterly (2015), 21(4), 501-510, database is CAplus.

The optimized methods for N-alkyl and N,N-dialkyl substituted thioureas synthesis starting from ammonium thiocyanates, waste water constituent from the production of tetramethylthiuram monosulfide (TMTS), and alkyl amine, are presented in this work. Thioureas synthesis was developed in two ways: Method I – reaction of the thiocyanate and alkylamine in the presence of hydrochloric acid; Method II – reaction of the thiocyanate with benzoyl chloride following by amine addition in the first step, and base hydrolysis in the second step. The structure of the synthesized compounds was confirmed by IR, ¹H- and ¹³C-NMR and MS instrumental methods, and purity was determined by high-performance liquid chromatog. method. It is shown that the proposed methods offer a high degree of conversion and purity of product, absence of byproducts and technol. applicability at industrial scale. Considering the importance of the tetramethylthiuram disulfide (TMTD) and TMTS as vulcanization accelerators as well as thiourea as the pharmacol. active compounds, it can be said that application of the optimized methods of thiourea synthesis will provide significant improvement in sustainable development and implementation of eco-friendly production technol. The described environmentally benign process of thioureas synthesis represents a suitable option to existing methods.

Chemical Industry & Chemical Engineering Quarterly 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, Computed Properties of 6972-05-0.

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

Jiricek, I. published the artcileEcologically acceptable N-based compounds in corrosion inhibition in acidic media, Formula: C14H31NO2, the publication is Annali dell’Universita di Ferrara, Sezione 5: Chimica Pura ed Applicata, Supplemento (1995), 235-44, database is CAplus.

Selected amides of fatty acids with 16-18 carbon atoms in mol. and mol. weight of 300-400 were investigated to find a perspective ecol. supplement to corrosion inhibitors used nowadays in acidic environments. Weight-loss, potentiodynamic polarization, impedance spectroscopy and hydrogen penetration were among the methods used in the study. Results show that good protection can be expected from all organic compounds investigated. Inhibition efficiency of 90-97% at room temperature can be expected. Effectiveness is decreased with increasing temperature Addition of inhibitor into solution also affects hydrogen transport through the carbon steel sheet material.

Annali dell’Universita di Ferrara, Sezione 5: Chimica Pura ed Applicata, Supplemento 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, Formula: C14H31NO2.

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

Stavytskyi, Viktor published the artcileTandem heterocyclization of 2-(azolyl-(azinyl-))anilines as an efficient method for preparation of substituted pyrrolo[1,2-a]azolo-(azino-)[c]quinazolines, Formula: C10H10O3, the publication is Journal of Heterocyclic Chemistry (2020), 57(3), 1249-1260, database is CAplus.

The synthesis of novel pyrrolo[1,2-a]azolo(azino)[c]quinazolines I (R¹ = Me, Ph, HO₂C, HO₂CCH₂CH₂; R² = Me, Ph, 4-i-PrC₆H₄, 2-thienyl) and II (R¹ as above; X = N, CHMe, CHPh, etc.) by tandem reaction of the corresponding o-aminophenyl-substituted azines and azoles with oxocarboxylic acids R¹C(O)CH₂CH₂CO₂H is described. The mechanism of formation of the compounds I and II was proposed, and the intermediate of the heterocyclization has been isolated and characterized. The IR-, ¹H and ¹³C NMR-, chromato-mass spectra of synthesized compounds were studied for estimation of their structure and spectral patterns features. The mol. structure of the obtained compounds was addnl. proved by X-ray diffraction method.

Journal of Heterocyclic 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 C7H7ClN2S, Formula: C10H10O3.

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

Brouwers, Hilde published the artcileHyaluronidase treatment of synovial fluid is required for accurate detection of inflammatory cells and soluble mediators, Computed Properties of 6217-54-5, the publication is Arthritis Research & Therapy (2022), 24(1), 18, database is CAplus and MEDLINE.

Synovial fluid (SF) is commonly used for diagnostic and research purposes, as it is believed to reflect the local inflammatory environment. Owing to its complex composition and especially the presence of hyaluronic acid, SF is usually viscous and non-homogeneous. In this study, we investigated the importance of homogenization of the total SF sample before subsequent anal. SF was obtained from the knee of 29 arthritis patients (26 rheumatoid arthritis, 2 osteoarthritis, and 1 juvenile idiopathic arthritis patient) as part of standard clin. care. Synovial fluid was either treated with hyaluronidase as a whole or after aliquoting to determine whether the concentration of soluble mediators is evenly distributed in the viscous synovial fluid. Cytokine and IgG levels were measured by ELISA or Luminex and a total of seven fatty acid and oxylipin levels were determined using LC-MS/MS in all aliquots. For cell anal., synovial fluid was first centrifuged and the pellet was separated from the fluid. The fluid was subsequently treated with hyaluronidase and centrifuged to isolate remaining cells. Cell numbers and phenotype were determined using flow cytometry. In all patients, there was less variation in IgG, 17-HDHA, leukotriene B4 (LTB4), and prostaglandin E2 (PGE2) levels when homogenization was performed before aliquoting the SF sample. There was no difference in variation for cytokines, 15-HETE, and fatty acids arachidonic acid (AA), eicosapentaenoic acid (EPA), and docosahexaenoic acid (DHA). Between 0.8 and 70% of immune cells (median 5%) remained in suspension and were missing in subsequent analyses when the cells were isolated from untreated SF. This percentage was higher for T and B cells: 7-85% (median 22%) and 7-88% (median 23%), resp. Homogenization of the entire SF sample leads to less variability in IgG and oxylipin levels and prevents erroneous conclusions based on incomplete isolation of synovial fluid cells.

Arthritis Research & Therapy 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, Computed Properties of 6217-54-5.

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