Catalysis-chemistry

Gao, Yang published the artcilePractical synthesis of 3-aryl anthranils via an electrophilic aromatic substitution strategy, Computed Properties of 118-90-1, the publication is Chemical Science (2022), 13(7), 2105-2114, database is CAplus and MEDLINE.

A practical route for the synthesis of valuable 3-aryl anthranils from readily available anthranils and simple arenes by using the classical electrophilic aromatic substitution (EAS) strategy was reported. This transformation goes through an electrophilic substitution and rearomatisation sequence by employing Tf₂O as an effective activator. A wide range of arenes were compatible in this transformation, delivering various structurally diversified 3-aryl anthranils in good yields and high regioselectivity. In addition, a variety of readily available feedstocks such as olefins, alkenyl triflates, silyl enolethers, carbonyl compounds, thiophenols and thiols could also participate in the reaction to achieve the C3 alkenylation, alkylation and thioetherification of anthranils. Of note, the synthesized 3-aryl anthranils proved to be a highly robust platform to access a series of biol. active compounds, drug derivatives and organic optoelectronic materials.

Chemical Science 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 C8H8O2, Computed Properties of 118-90-1.

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

He, Min published the artcile7,10-Dibromo-2,3-dicyanopyrazinophenanthrene Aggregates as a Photosensitizer for Nickel-Catalyzed Aryl Esterification, Quality Control of 118-90-1, the publication is Synlett (2022), 33(12), 1189-1193, database is CAplus.

Self-assembled aggregates of 7,10-dibromo-2,3-dicyanopyrazinophenanthrene which act as a new organophotocatalyst in combination with Ni catalyst for the C_aryl-O_acyl cross-coupling reactions of carboxylic acids with aryl halides are described. This visible-light-induced C_aryl-O_acyl bond-formation reaction proceeded smoothly to afford aryl esters with satisfactory to excellent yields.

Synlett 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 C8H8O2, Quality Control of 118-90-1.

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

Li, Zhilong published the artcileOn the Superior Activity of In(I) versus In(III) Cations Toward ortho-C-Alkylation of Anilines and Intramolecular Hydroamination of Alkenes, Computed Properties of 928836-00-4, the publication is Journal of Organic Chemistry (2020), 85(20), 12947-12959, database is CAplus and MEDLINE.

An efficient ortho-C-alkylation of unprotected anilines with a variety of styrenes and alkenes using a univalent cationic indium(I) catalyst is reported. Mechanistic studies revealed that the reaction likely proceeds via a tandem hydroamination/Hofmann-Martius rearrangement. The high compatibility between the cationic indium(I) complex and primary anilines led us to develop an In(I)⁺-catalyzed hydroamination of alkenes using unprotected primary and secondary alkenylamines. Computations support the catalytic activity of naked In(I)⁺ ions, with an outer sphere mechanism for the C-N bond formation and a potentially inner sphere protodemetallation.

Journal of Organic Chemistry published new progress about 928836-00-4. 928836-00-4 belongs to catalysis-chemistry, auxiliary class Alkenyl,Amine,Aliphatic hydrocarbon chain, name is 2,2-Diallylpent-4-en-1-amine, and the molecular formula is C11H19N, Computed Properties of 928836-00-4.

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

Sun, Xue-Jie published the artcileElectrochemically Oxidative Coupling of S-H/S-H for S-S Bond Formation: A Facile Approach to Diacid-disulfides, COA of Formula: C14H10O4S2, the publication is ChemistrySelect (2020), 5(15), 4637-4641, database is CAplus.

A green electrochem. method of preparing diacid-disulfides was developed, in which an S-S bond was formed by electrochem. oxidative coupling of S-H/S-H employing redox active NaI as mediator. The reactions were carried out in a simple undivided cell under constant current condition at room temperature and completed in 1.3 h to afford a series of diacid-disulfides with up to 97% yields.

ChemistrySelect 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 C4Br2N2O4S, COA of Formula: C14H10O4S2.

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

Tang, Hong published the artcileSynthesis of biaryl compounds via Suzuki homocoupling reactions catalyzed by metal organic frameworks encapsulated with palladium nanoparticles, Category: catalysis-chemistry, the publication is Inorganic Chemistry Communications (2021), 108368, database is CAplus.

Heterogeneous homocoupling reactions of phenylboronic acids were greatly accelerated via Suzuki homocoupling reactions. In this work, a tandem route was designed which firstly one part of phenylboronic acids reacted with iodine to form iodobenzenes, then another part of phenylboronic acids coupled with iodobenzenes to produce biaryl compounds The tandem reaction were catalyzed by a bifunctional heterogeneous catalyst of metal organic frameworks encapsulated with palladium nanoparticles (Pd@MOFs). This strategy for forming sym. C-C bond between benzene rings has obvious advantages such as high efficiency, easy separation, good recyclability and no addition of toxic halogenated benzene.

Inorganic Chemistry Communications 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 C17H18N2O6, Category: catalysis-chemistry.

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

Zhao, Long published the artcileOne-Pot Synthesis of 3-(1,2,3,4-Tetrahydroisoquinolin-1-yl)-isoquinolin-1(2H)-ones by DEAD-Promoted Oxidative Ugi-Wittig Reaction Starting from Phosphonium Salt Precursors, COA of Formula: C8H8O2, the publication is Synlett (2022), 33(1), 66-69, database is CAplus.

A new one-pot synthesis of 3-(1,2,3,4-tetrahydroisoquinolin-1-yl)-isoquinolin-1(2 H)-ones I (R¹ = H, Cl, Br; R² = TsCH₂, C₆H₅CH₂, CH₂CO₂OMe; R³ = Ph, 4-MeC₆H₄, etc.) by DEAD-promoted oxidative Ugi-Wittig reaction was developed. The sequential reactions of (2-carboxybenzyl)triphenylphosphonium salts II?Br^– (R¹ = H, Cl, Br), isocyanides R²NC, and N-aryl-1,2,3,4-tetrahydroisoquinolines III produced 3-(1,2,3,4-tetrahydroisoquinolin-1-yl)-isoquinolin-1(2 H)-ones I in moderate to good overall yields in the presence of DEAD and Et₃N.

Synlett 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 C13H11NO, COA of Formula: C8H8O2.

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

Weigand, Miranda R. published the artcileEnhancement of lipid signals with ammonium fluoride in negative mode Nano-DESI mass spectrometry imaging, Name: Docosahexaenoic Acid, the publication is International Journal of Mass Spectrometry (2022), 116859, database is CAplus.

Lipids play an important role in biol. Their structural diversity presents challenges for untargeted mass spectrometry imaging (MSI) and anal. techniques. Enhancing the lipid coverage of MSI experiments is an important step to understanding their role in biol. processes. Herein, we use nanospray desorption electrospray ionization mass spectrometry imaging (nano-DESI MSI) to explore the effect of ammonium fluoride (NH4F) as a solvent additive for enhanced detection of lipids in biol. tissues. Although fatty acids and phospholipids are readily observed in nano-DESI MSI, other lipid classes are difficult to detect due to their low abundance and low ionization efficiency. We have evaluated enhancement factors of lipids in neg. ionization mode in the presence of NH4F in the nano-DESI solvent. We observed a 10-110-fold enhancement in lipid signals detected as [M – H]- ions using 500¦ÌM NH4F in 9:1 methanol:water in comparison with 9:1 methanol:water, which is typically used in nano-DESI MSI experiments The observed signal enhancement is attributed to the efficient proton abstraction from lipids by F-. The enhancement factors observed for fatty acids are correlated to their interfacial pKa values. The optimized solvent composition enables sensitive imaging of both high- and low-abundance lipids without any adverse effect on the noise level. Overall, our results demonstrate a substantial improvement in sensitivity of nano-DESI MSI of lipids in biol. tissues when NH4F is added to the nano-DESI solvent.

International Journal of Mass Spectrometry 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 C8H15NO, Name: Docosahexaenoic Acid.

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

Zhang, Qijun published the artcilePM_2.5-PAHs and PM₁₀-PAHs at roadside environment: levels, meteorological impact, source apportionment, and health risks, Recommanded Product: Coronene, the publication is Air Quality, Atmosphere & Health (2022), 15(7), 1287-1301, database is CAplus.

Polycyclic aromatic hydrocarbon (PAH) concentrations in PM₁₀ and PM_2.5 were measured at the roadside of 4 typical urban roads in Tianjin from Jan. to August 2015. The medium flow samplers with pretreated quartz filters were used for particulate matter sampling. Eighteen PAHs were analyzed by gas chromatog.-mass spectrometry. The concentrations of PM_2.5-PAHs and PM₁₀-PAHs in winter were 74.98 ng/m³ and 94.22 ng/m³, followed by spring and the lowest in summer. The traffic flow is pos. correlated with benzo(a)pyrene, benzo(g,h,i)perylene, and coronene. The vehicle speed and temperature are significantly pos. correlated with low-ring polycyclic aromatic hydrocarbons and neg. correlated with the middle- and high-cyclic aromatic hydrocarbons. The ratio anal. of some PM_2.5-PAHs and PM₁₀-PAHs suggests that gasoline and diesel vehicles were the major sources of the studied area. Industrial emission, vehicle exhaust, and vehicle non-exhaust (tire wear, brake pad wear, and road dust) were identified as the major sources of roadside PAHs using pos. matrix factorization anal. The incremental lifetime cancer risk of ingestion and dermal contact were higher than that of inhalation, indicating that ingestion and dermal contact were the primary exposure routes for cancer. Therefore, it is necessary to take measures to strictly control the PM-PAHs pollution emitted by motor vehicles and formulate standards for PM-PAHs emitted by vehicles.

Air Quality, Atmosphere & Health published new progress about 191-07-1. 191-07-1 belongs to catalysis-chemistry, auxiliary class Electronic Materials, name is Coronene, and the molecular formula is C10H16O2, Recommanded Product: Coronene.

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

Li, Xiang published the artcileOrganocatalytic tandem Morita-Baylis-Hillman-Michael reaction for asymmetric synthesis of a drug-like oxa-spirocyclic indanone scaffold, SDS of cas: 4230-93-7, the publication is Chemical Communications (Cambridge, United Kingdom) (2013), 49(77), 8692-8694, database is CAplus and MEDLINE.

A novel multicatalytic MBH-Michael tandem reaction has been developed for the asym. assembly of ninhydrin, nitroolefins and aldehydes into a structurally complex oxa-spirocyclic indanone backbone, e.g., I. Successive iodocyclization allowed us to convert these multifunctional allylic products into fused chiral natural product mimics,e.g.,II.

Chemical Communications (Cambridge, United Kingdom) 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, SDS of cas: 4230-93-7.

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

Heo, Nam Jung published the artcileCapture and displacement-based release of the bicarbonate anion by calix[4]pyrroles with small rigid straps, SDS of cas: 17351-61-0, the publication is Chemical Science (2020), 11(31), 8288-8294, database is CAplus and MEDLINE.

Two-phenoxy walled calix[4]pyrroles 1 and 2 strapped with small rigid linkers containing pyridine and benzene, resp., have been synthesized. ¹H NMR spectroscopic analyses carried out in CDCl₃ revealed that both of receptors 1 and 2 recognize only F^– and HCO₃^– among various test anions with high preference for HCO₃^– (as the tetraethylammonium, TEA⁺ salt) relative to F^– (as the TBA⁺ salt). The bound HCO₃^– anion was completely released out of the receptors upon the addition of F^– (as the tetrabutylammonium, TBA⁺ salt) as a result of significantly enhanced affinities and selectivities of the receptors for F^– once converted to the TEAHCO₃ complexes. Consequently, relatively stable TEAF complexes of receptors 1 and 2 were formed via anion metathesis occurring within the receptor cavities. By contrast, the direct addition of TEAF to receptors 1 and 2 produces different complexation products initially, although eventually the same TEAF complexes are produced as via sequential TEAHCO₃ and TBAF addition These findings are rationalized in terms of the formation of different ion pair complexes involving interactions both inside and outside of the core receptor framework.

Chemical Science 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, SDS of cas: 17351-61-0.

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