Catalysis-chemistry

Li, Yuehui published the artcileGeneral and Selective Copper-Catalyzed Reduction of Tertiary and Secondary Phosphine Oxides: Convenient Synthesis of Phosphines, Product Details of C15H15OP, the publication is Journal of the American Chemical Society (2012), 134(23), 9727-9732, database is CAplus and MEDLINE.

Novel catalytic reductions of tertiary and secondary phosphine oxides to phosphines have been developed. Using tetramethyldisiloxane (TMDS) as a mild reducing agent in the presence of copper complexes, PO bonds are selectively reduced in the presence of other reducible functional groups (FGs) such as ketones, esters, and olefins. Based on this transformation, an efficient one pot reduction/phosphination domino sequence allows for the synthesis of a variety of functionalized aromatic and aliphatic phosphines in good yields.

Journal of the American Chemical Society 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, Product Details of C15H15OP.

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

Biswas, Rima published the artcileAgNPs Immobilized over Functionalized 2D Hexagonal SBA-15 for Catalytic C-H Oxidation of Hydrocarbons with Molecular Oxygen under Solvent-Free Conditions, Related Products of catalysis-chemistry, the publication is ACS Sustainable Chemistry & Engineering (2020), 8(15), 5856-5867, database is CAplus.

Activation of C-H bonds of hydrocarbons is one of the thrust areas of research over the years. Designing a robust catalyst, which can work efficiently under eco-friendly conditions for this reaction still remains a big challenge today. Highly dispersed aggregation-free silver nanoparticles (AgNPs) are immobilized over 2D hexagonally ordered functionalized mesoporous silica material via surface thioether functionalization, and the resulting supported AgNPs (AgMS) displayed environmentally benign selective oxidation of C-H bonds of the aliphatic and monocyclic hydrocarbons into their resp. carbonyl compounds The AgMS catalyst exhibited excellent activity toward liquid phase oxidation of C-H bonds under solvent-free and base-free neat conditions using mol. oxygen as the oxidant. This methodol. was successfully applied for the oxidation of substituted toluene, benzylic C-H bonds, and cycloalkanes with very good conversion and selectivity. Moreover, the hydrocarbon conversion and selectivity for the carbonyl products in this partial oxidation reaction have been retained after six reaction cycles. Therefore, immobilization of AgNPs at the surface of ordered mesoporous silica offers a very efficient route in designing a readily separable, reusable, very robust, and promising catalyst for C-H bond activation under eco-friendly reaction conditions.

ACS Sustainable Chemistry & Engineering 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, Related Products of catalysis-chemistry.

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

Rajesh published the artcileManganese complexes of bis-benzimidazolyl ligand as novel quenchers of superoxide radical anion, Category: catalysis-chemistry, the publication is Polyhedron (1997), 16(20), 3511-3517, database is CAplus.

Mn^II/Mn^III complexes [Mn(DGB)X₂]^0/+ and [Mn(BBB)₂X]²⁺ were synthesized utilizing an exogenous anionic ligand (X = OAc, SCN) with tridentate bis(2-benzimidazolylmethyl)ether (DGB) and bidentate 1,2-bis(2-benzimidazolyloxamethyl)benzene (BBB) ligands. The visible spectra of the Mn^III compounds suggests pseudo C_4v symmetry, and the EPR data on the Mn^II complexes indicates a similar geometry. Cyclic-voltammetric studies reveal that the E_1/2 for the Mn^II/Mn^III couple shifts to a pos. value with acetate as an anionic ligand, implying that this anion stabilizes the Mn^II oxidation state while the E_1/2 data for SCN reveals that the anion stabilizes the Mn^III state. The reoxidation step of the superoxide formed in the cyclic-voltammetric experiments becomes irreversible in the presence of Mn complexes; suggesting that these complexes act as good quenchers for superoxide anion.

Polyhedron 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, Category: catalysis-chemistry.

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

Dey, Sandeep Kumar published the artcileSelective inclusion of PO₄^3- within persistent dimeric capsules of a tris(thiourea) receptor and evidence of cation/solvent sealed unimolecular capsules, COA of Formula: C9H21NO3, the publication is Dalton Transactions (2012), 41(29), 8960-8972, database is CAplus and MEDLINE.

A tren-based tris(thiourea) receptor N[CH₂CH₂NHC(:S)NH-p-C₆H₄-NO₂]₃, L with electron-withdrawing p-nitrophenyl terminals has been established as a competent hydrogen-bonding scaffold that can selectively encapsulate PO₄^3- within persistent and rigid dimeric capsules, assembled by aromatic ¦Ð-stacking interactions between the receptor side-arms. A quaternary ammonium salt of PO₄^3- capsules can reproducibly be obtained in quant. yields by a solution-state deprotonation of [HL]⁺ moieties and a bound HPO₄^2- anion of complex 1a (HPO₄^2- complex of protonated L, 2 : 1 host-guest), induced by the presence of a large excess of anions such as HCO₃^–, CH₃CO₂^–, and F^–. Qual. as well as quant. ¹H and ³¹P NMR experiments (DMSO-d₆) have been carried out in detail to demonstrate the selective and preferential inclusion of PO₄^3- by L in solution-states. Competitive crystallization experiments performed in the presence of an excess of anions such as HCO₃^–, HSO₄^–, CH₃CO₂^–, NO₃^– and halides (F^– and Cl^–) further establish the phenomenon of selective PO₄^3- encapsulation as confirmed by ¹H NMR, ³¹P NMR, FT-IR and powder X-ray diffraction patterns of the isolated crystals. X-ray structural analyses and ³¹P NMR studies of the isolated crystals of phosphate complexes provide evidence of the binding discrepancy of inorganic phosphates with protonated and neutral form of L. Furthermore, extensive studies have been carried out with other anions of different sizes and dimensions in solid- and solution-states. Crystal structure elucidation revealed the formation of a solvent (DMSO) sealed unimol. capsule in the F^– encapsulated complex, a CO₃^2- encapsulated centrosym. mol. capsule and a cation (tetrabutylammonium) sealed SO₄^2- encapsulated unimol. capsule. 2D-NOESY NMR experiments carried out on these capsule complexes further confirm the relevant binding stoichiometry of complexes except for the PO₄^3--encapsulated complex which showed a 1 : 1 host-guest stoichiometry in solution

Dalton Transactions published new progress about 17351-61-0. 17351-61-0 belongs to catalysis-chemistry, auxiliary class Phase Transfer Catalyst, name is Tetraethylammonium hydrogencarbonate, and the molecular formula is C9H21NO3, COA of Formula: C9H21NO3.

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

Basu, Arghya published the artcileA C₃ -Symmetric Tripodal Urea Receptor for Anions and Ion Pairs: Formation of Dimeric Capsular Assemblies of the Receptor during Anion and Ion Pair Coordination, Safety of Tetraethylammonium hydrogencarbonate, the publication is Journal of Organic Chemistry (2014), 79(6), 2647-2656, database is CAplus and MEDLINE.

A new C₃ -sym. urea-based heteroditopic tripodal receptor capable of recognizing both anions and ion pairs was designed, synthesized, and characterized. The protonated receptor forms a sulfate complex which encapsulates a single DMF in the tripodal cavity of the receptor. However, the SO₄^2- anion is located outside the tripodal cavity and is stabilized by N-H¡¤¡¤¡¤O hydrogen bonds from the urea functions of four receptor cations. With TBAHSO₄ the receptor forms a contact ion pair complex, where both the TBA⁺ and SO₄^2- groups are pseudoencapsulated in the tripodal cavity of the protonated receptor. Significantly, the receptor forms a charge-separated polymeric ion pair complex with K⁺ and HPO₄^2- via formation of a dimeric capsular assembly of the receptor, in which three K⁺ encapsulated dimeric capsular assemblies interdigitate to form a precise cavity that further encapsulates HPO₄^2-. The receptor also forms an anion complex with CO₃^2- via formation of dimeric capsular self-assembly of the receptor. Solution-state binding studies of the receptor with oxyanions also were carried out by ¹H NMR titration experiments, which show the oxyanion binding trend HCO₃^– > H₂PO₄^– > HSO₄^–, whereas no binding with NO₃^– and ClO₄^– anions is observed

Journal of Organic Chemistry published new progress about 17351-61-0. 17351-61-0 belongs to catalysis-chemistry, auxiliary class Phase Transfer Catalyst, name is Tetraethylammonium hydrogencarbonate, and the molecular formula is C9H21NO3, Safety of Tetraethylammonium hydrogencarbonate.

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

Akram, Manjur O. published the artcileLigand-Enabled Gold-Catalyzed C(sp²)-N Cross-Coupling Reactions of Aryl Iodides with Amines, Recommanded Product: Bis(4-nitrophenyl)amine, the publication is Organic Letters (2019), 21(19), 8101-8105, database is CAplus and MEDLINE.

The first example of ancillary (P,N)-ligand-enabled gold-catalyzed C-N cross-coupling reactions of aryl iodides with amines is reported. The high generality of the reaction in de novo synthesis, late-stage modifications, and cascade processes to access functionalized indolinones and carbazoles underscores the synthetic potential of the presented strategy. Monitoring the reaction with ESI-HRMS and NMR provided strong evidence for the in situ formation of putative high valent Au(III) intermediates.

Organic Letters 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

Tan, Kemin published the artcileSynthesis of a novel open-framework sulfide, CuGe₂S₅.(C₂H₅)₄N, and its structure solution using synchrotron imaging plate data, SDS of cas: 17351-61-0, the publication is Journal of the American Chemical Society (1995), 117(26), 7039-40, database is CAplus.

The open-framework sulfide, (NEt₄)[CuGe₂S₅] was prepared and its structure determined using synchrotron imaging plate data. The structure consists of Ge₄S₁₀^4- tetrahedral clusters bridged by Cu(I). The Cu(II) was reduced during the hydrothermal synthesis.

Journal of the American Chemical Society published new progress about 17351-61-0. 17351-61-0 belongs to catalysis-chemistry, auxiliary class Phase Transfer Catalyst, name is Tetraethylammonium hydrogencarbonate, and the molecular formula is C10H11FN2O2S, SDS of cas: 17351-61-0.

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

Wolfs, Melanie published the artcileEffect of hydrocarbon chain branching in the elaboration of superhydrophobic materials by electrodeposition of conducting polymers, SDS of cas: 3115-28-4, the publication is Surface and Coatings Technology (2014), 259(Part_C), 594-598, database is CAplus.

Here, the authors study for the first time the influence of hydrocarbon chain branching on the formation of surface structures and on superhydrophobic properties obtained by electrodeposition of conducting polymers. Two series of 3,4-ethylenedioxythiophene (EDOT) derivatives with branched hydrocarbon chains were synthesized and the surface properties were compared with linear hydrocarbon chains. The authors show that hydrocarbon chain branching reduces the intrinsic hydrophobicity of the substituent. As a consequence, the branching can lead to smoother films, due to the increase in the solubility of the oligomers formed in the first instances of the polymerization, than that obtained with linear hydrocarbon chains. Here, highly structured films with non-wetting properties close to superhydrophobic properties are obtained with linear hydrocarbon chains from a total number of carbon of 8 while relatively smooth hydrophobic films are obtained with branched hydrocarbon chains. This work is extremely important in the control of the surface properties of electrodeposited conducting polymers.

Surface and Coatings Technology published new progress about 3115-28-4. 3115-28-4 belongs to catalysis-chemistry, auxiliary class Aliphatic Chain, name is 2-Butylhexanoic acid, and the molecular formula is C14H12O3, SDS of cas: 3115-28-4.

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

Neves, Bruno J. published the artcileDiscovery of New Anti-Schistosomal Hits by Integration of QSAR-Based Virtual Screening and High Content Screening, Safety of 1,2-Dimethoxy-4-(2-nitrovinyl)benzene, the publication is Journal of Medicinal Chemistry (2016), 59(15), 7075-7088, database is CAplus and MEDLINE.

Schistosomiasis is a debilitating neglected tropical disease, caused by flatworms of Schistosoma genus. The treatment relies on a single drug, praziquantel (PZQ), making the discovery of new compounds extremely urgent. In this work, we integrated QSAR-based virtual screening (VS) of Schistosoma mansoni thioredoxin glutathione reductase (SmTGR) inhibitors and high content screening (HCS) aiming to discover new antischistosomal agents. Initially, binary QSAR models for inhibition of SmTGR were developed and validated using the Organization for Economic Co-operation and Development (OECD) guidance. Using these models, we prioritized 29 compounds for further testing in two HCS platforms based on image anal. of assay plates. Among them, 2-[2-(3-methyl-4-nitro-5-isoxazolyl)vinyl]pyridine and 2-(benzylsulfonyl)-1,3-benzothiazole, two compounds representing new chem. scaffolds have activity against schistosomula and adult worms at low micromolar concentrations and therefore represent promising antischistosomal hits for further hit-to-lead optimization.

Journal of Medicinal Chemistry published new progress about 4230-93-7. 4230-93-7 belongs to catalysis-chemistry, auxiliary class Alkenyl,Nitro Compound,Benzene,Ether, name is 1,2-Dimethoxy-4-(2-nitrovinyl)benzene, and the molecular formula is C10H11NO4, Safety of 1,2-Dimethoxy-4-(2-nitrovinyl)benzene.

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

Hankin, Danielle M. published the artcileA new type of sulfenamido ligand. Crystal structure of W(NBu^t)₂(¦Ç²-PhSNBu^t)₂, Computed Properties of 19117-31-8, the publication is Journal of the Chemical Society, Dalton Transactions: Inorganic Chemistry (1995), 1059-60, database is CAplus.

The interaction of Li₂W(NBu^t)₄ with PhSCl gave W(NBu^t)₂(¦Ç²-PhSNBu^t)₂ the structure of which was determined by x-ray diffraction. Reaction of Li(PhSNBu^t) with transition-metal halides gave a range of other compounds with the ¦Ç²-N,S ligand.

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, Computed Properties of 19117-31-8.

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