Catalysis-chemistry

He, Hongru published the artcilePolyoxometalate-modified halloysite nanotubes-based thin-film nanocomposite membrane for efficient organic solvent nanofiltration, Synthetic Route of 13822-56-5, the publication is Separation and Purification Technology (2022), 121348, database is CAplus.

Polyoxometalate-modified halloysite nanotubes (POM@MHNTs) were synthesized and doped into the polyamide (PA) matrix by interfacial polymerization to prepare doped POM@MHNTs thin-film nanocomposite (TFN) membranes for organic solvent nanofiltration (OSN). It is worth noting that the methanol flux of the TFN can be efficiently enhanced by tuning the contents of POM@MHNTs. The as-synthesized optimal sample (TFN-0.10) exhibits superior methanol flux of TFN-0.10 membrane of 14.80 L m^-2 h^-1 bar^-1 (1.76 times of that of undoped TFC membrane and 1.12 times of that of doped HNTs membrane (TFN-HNTs-0.10). These are mainly due to the tubular structure of POM@MHNTs providing addnl. solvent transfer channels and the ridge-valley morphol. of the membrane surface increasing the contact area between the membrane and the solvent. Meanwhile, the POM@MHNTs nanohybrids are similarly electrostatically attracted by the amide groups on the polyamide chains produced by interfacial polymerization, improving the compatibility of POM@MHNTs with polyamide membranes. TFN-0.10 OSN membrane showed stable chem. properties in medium polar organic (methanol, ethanol, THF), acid polar organic (acetonitrile), and strong polar organic (DMF) solvents. Prepared TFN OSN membranes exhibited strong long-term operation capability and organic solvent resistance after 80¡ãC DMF immersion for 7 days with inconspicuous separation performance changes. This work offers the prospect of using organic-inorganic hybrid modified nanomaterials to improve OSN performance.

Separation and Purification Technology 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, Synthetic Route of 13822-56-5.

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

Li, Zhaojing published the artcileAsymmetric Catalytic Synthesis of Hexahydropyrrolo-isoquinolines via Three-Component 1,3-Dipolar-Cycloaddition, Category: catalysis-chemistry, the publication is Chemistry – A European Journal (2021), 27(60), 14841-14845, database is CAplus and MEDLINE.

An asym. three-component 1,3-dipolar cycloaddition of 3,4-dihydroisoquinolines, bromoacetates and ¦Á,¦Â-unsaturated pyrazole amides was realized by using a chiral N,N’-dioxide-Y(OTf)₃ complex as the catalyst. The process included a base-promoted formation of dihydroisoquinolium ylides in situ, and a chiral Lewis acid-catalyzed asym. [3+2] cycloaddition with ¦Á,¦Â-unsaturated pyrazole amides. A series of hexahydropyrrolo-isoquinolines I [R = Pr, Ph, 4-BrC₆H₄, etc.; R¹ = Et, OMe, O-tBu, OBn; R² = H, 5-Br, 6-OMe, etc.] were obtained in moderate to good yields with excellent diastereo- and enantioselectivities.

Chemistry – A European Journal published new progress about 16909-09-4. 16909-09-4 belongs to catalysis-chemistry, auxiliary class Alkenyl,Carboxylic acid,Benzene,Ether, name is (E)-3-(2,4-Dimethoxyphenyl)acrylic acid, and the molecular formula is C11H12O4, Category: catalysis-chemistry.

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

Tian, Jia published the artcileSelective flotation separation of ilmenite from titanaugite using mixed anionic/cationic collectors, Safety of Dodecylamineacetate, the publication is International Journal of Mineral Processing (2017), 102-107, database is CAplus.

The flotation behavior of ilmenite and titanaugite using anionic collector sodium oleate (NaOL), cationic collector dodecylamine acetate (DAA) and the mixed anionic/cationic collector (NaOL-DAA) was investigated through micro-flotation experiments, zeta potential measurements, Fourier transform IR (FTIR) analyses, and the artificially mixed minerals flotation experiments The results of the microflotation experiments indicate that DAA exhibits good flotation performance to both ilmenite and titanaugite at a pH > 6.0. The flotation separation of ilmenite from titanaugite can be performed using the mixed NaOL-DAA in a wide pH range of 5.0-7.0. In this pH range, the recovery of ilmenite remains constant at approx. 90%, while the recovery of titanaugite remains < 25%. The best separation result can be achieved with NaOL-DAA molar ratios of 10:1. The results of the zeta potential experiments and the FTIR analyses indicate that the adsorption of the mixed collector, NaOL-DAA, on the ilmenite surface is larger than on the titanaugite surface and that the NaOL-DAA complex might be mainly adsorbed on the ilmenite surface by chem. adsorption, apart from electrostatic adsorption. The synthetic mineral mixture micro-flotation results demonstrate that, compared to NaOL, NaOL-DAA not only increases the recovery and grade of the TiO₂ by 7.02% and 6.71%, resp., but also decreases the reagent consumption by half.

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 C11H21BF4N2O2, Safety of Dodecylamineacetate.

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

Huang, Wen-Ching published the artcileEffects of exercise on high-fat diet-induced non-alcoholic fatty liver disease and lipid metabolism in ApoE knockout mice, Recommanded Product: Docosahexaenoic Acid, the publication is Nutrition & Metabolism (2022), 19(1), 10, database is CAplus and MEDLINE.

Non-alc. fatty liver disease (NAFLD), which is growing more common in the Western world, has become the main cause of chronic liver disease and is strongly associated with metabolism syndromes. NAFLD can indicate a wide spectrum of hepatic pathologies, ranging from simple hepatic steatosis and inflammatory non-alc. steatohepatitis to more severe stages of fibrosis and cirrhosis. Moreover, evidence has demonstrated that phys. inactivity and westernized dietary habits may facilitate the development of NAFLD. Lipid modulation and metabolism could be important factors in the development of steatosis. Lipid species, characterized using a lipidomic approach with untargeted anal., could provide potential biomarkers for the pathogenesis of NAFLD or therapeutic applications. Thus, in this study, the effects of exercise on the improvement of NAFLD were further investigated from a lipidomic perspective through the aspects of lipid regulation and metabolism Wild type (WT) C57BL/6 J and C57BL/6-ApoEem1Narl/Narl mice were assigned to one of four groups: WT mice fed a normal chow diet (CD), apolipoprotein E (ApoE) knockout mice fed a normal CD, ApoE knockout mice fed a high-fat diet (HFD), and ApoE knockout mice fed a HFD and provided with swimming exercise. The treatments (e.g., normal diet, HFD, and exercise) were provided for 12 consecutive weeks before the growth curves, biochem., fat composition, pathol. syndromes, and lipid profiles were determined Exercise significantly reduced the HFD-induced obesity (weight and fat composition), adipocyte hypertrophy, liver lipid accumulation, and pathol. steatosis. In addition, exercise ameliorated HFD-induced steatosis in the process of NAFLD. The lipidomic anal. revealed that the changes in plasma triglyceride (14:0/16:0/22:2), phosphatidic acid (18:0/17:2), and phosphatidylglycerol (16:0/20:2) induced by the administration of the HFD could be reversed significantly by exercise. The 12-wk regular exercise intervention significantly alleviated HFD-induced NAFLD through modulation of specific lipid species in plasma. This finding could elucidate the lipids effects behind the hepatic pathogenesis with exercise.

Nutrition & Metabolism 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, Recommanded Product: Docosahexaenoic Acid.

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

Liu, Jiang published the artcileEsterification of carboxylic acids with (¦Â-diazo-¦Á,¦Á-difluoroethyl)phosphonates under photochemical conditions, Quality Control of 104-03-0, the publication is Huaxue Xuebao (2021), 79(6), 747-750, database is CAplus.

Fluoroalkyl-substituted diazo compounds belong to one of the most powerful tools in organic synthetic chem. and their transformations have attracted numerous attention. Since the reagent, trifluorodiazoethane, was discovered in 1943, it has attracted many research interests in organic synthesis. On the contrary, the similar difluorodiazoethane (CF₂HCHN₂), which just changes CF₃ group to CF₂H group, however, leads to significant changes on their chem. properties, in particular the stability. Until now, the studies on difluorinated diazo compounds remain less explored. Therefore, the related chem. on difluorodiazoethane emerges as a hot research topic, and the inventory of methods for the preparation and application of new diazo compounds is continuously supplemented. In this communication, a visible-light- promoted esterification reaction of carboxylic acids with in situ generated (¦Â-diazo-¦Á,¦Á-difluoroethyl) phosphonates via O-H insertion has been achieved under mild conditions, which afforded ¦Á,¦Á-difluoromethyl phosphonates (DFMPs)-containing esters with good chem. yields. Several carboxylic acids and amines featuring various functional groups are well compatible in the reaction under photochem. conditions. A control experiment with the addition of D₂O has been performed to verify the proton-transfer process involved in this reaction, and a possible mechanism containing in situ generation of diazo intermediate and protonation is provided. This reaction is operationally simple and shows good functional group compatibility providing an efficient and sustainable strategy for the assembly of ¦Á,¦Á-difluorinated phosphonate derivatives A typical procedure for this visible-light- promoted reaction between (¦Â-diazo-¦Á, ¦Á-difluoroethyl)phosphonates and carboxylic acids is presented as follows: into a vail were taken amine 1 (0.2 mmol), carboxylic acid 2 (0.1 mmol), t-BuONO (0.24 mmol) and CHCl₃ (3 mL). The mixture was heated to 60¡ãC and stirred in the presence of 4.5 W blue LEDs for 4 h. Then, solvent was removed in vacuum. Product 3was purified by TLC plate of 20 cm¡Á20 cm using petroleum ether/ethyl acetate (4:1,V/V) as eluent.

Huaxue Xuebao 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, Quality Control of 104-03-0.

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

Jiang, Heyan published the artcileEfficient photocatalytic chemoselective and stereoselective C-C bond formation over AuPd@N-rich carbon nitride, Related Products of catalysis-chemistry, the publication is Catalysis Science & Technology (2021), 11(1), 219-229, database is CAplus.

Here, a AuPd@N-rich carbon nitride (NRCN) photocatalyst through simple ammonia solution heat treatment of carbon nitride and then AuPd NP loading was constructed. AuPd@NRCN exhibited extraordinary light color promoted catalytic performance in C-C bond formation under visible light in air. Surprisingly, both high chemoselectivity to unsym. Ullmann biaryl products RC₆H₄-C₆H₄R¹ (R = 3-chloro, 4-nitro, 2-methoxy, etc.; R¹ = H, 3-Me, 4-methoxy, etc.) and satisfactory stereoselectivity to Z-type Heck reaction products RC₆H₄CH=CHR² (R² = Ph, COOEt) could be achieved by changing the light source color. Various substrates exhibited great potential for the economical synthesis of unsym. biaryl products and Z-type olefins. Efficient visible light promoted C-I bond activation accompanied with improved photocatalytic coupling reaction efficiency over AuPd@NRCN was verified firstly by in situ DRIFTS. Considering that the Ullmann cross-coupling reaction is a multi-photon reaction, the improved photocatalytic performance in the Ullmann cross-coupling reaction using a combination of light sources with different colors might be due to the activation of different substrates and/or steps requiring different energies, and the combination of the two energy sources was beneficial for improving the activation efficiency of different substrates and/or steps. The activation of iodobenzene and styrene in the Heck reaction with light was also beneficial to the formation of the stilbene product. The light color promoted chemoselectivity and stereoselectivity are expected to have profound impact on organic synthetic methodol. improvement.

Catalysis Science & Technology 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

Lei, Jie published the artcileA concise and unexpected one-pot methodology for the synthesis of pyrazinone-fused pyridones, COA of Formula: C8H7NO4, the publication is Organic Chemistry Frontiers (2020), 7(18), 2657-2663, database is CAplus.

A facile one-pot cascade reaction for the synthesis of pyrazinone-fused pyridones I [R¹ = H, 5-Cl, 5-Br; R² = 4-BrC₆H₄, 4-O₂NC₆H₄, 4-NCC₆H₄, etc.; R³ = (CH₂)₃CH₃, cyclohexyl, 4-MeOC₆H₄, 2,6-di-MeC₆H₃, 2-Cl-6-MeC₆H₃, (CH₂)₂C₆H₅]/pyridones II [R⁴ = prop-2-ynyl, 3,5-di-MeC₆H₃, Bn, 1-(2-thienylmethyl); R⁵ = 2,6-di-MeC₆H₃, Bn, (CH₂)₂C₆H₅; R⁶ = H, 5-Br; R⁷ = 4-O₂NC₆H₄, 4-NCC₆H₄] was developed without a metal catalyst. Hydroamination of the Ugi propargyl adducts arising from aromatic isocyanides would be promoted by the intramol. protonation of the alkyne with the amide NH to form an unstable oxazolopyridinium. The cascade reaction was applied to alkyl isocyanide to synthesize pyrazinone-fused pyridones under strongly acidic conditions. This novel cascade reaction proceeded through an Ugi/Michael/Retro-Michael reaction, aromatization and 5-exo-dig cyclization cascade sequence. The reaction features a simple operation procedure, one purification step and good yields, which could be applicable to a broad scope of Ugi starting materials. This was the first report on the intramol. hydroamination occurring between an amide and an alkyne under conditions with an organic base.

Organic Chemistry Frontiers 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, COA of Formula: C8H7NO4.

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

Li, Jie published the artcileEmission characteristics and assessment of potential health risks on PM_2.5-bound organics from incense burning, Safety of Coronene, the publication is Atmospheric Pollution Research (2022), 13(3), 101326, database is CAplus.

Incense burning is a nonnegligible indoor air pollution source in many Asian countries, particularly in China. There is a lack of regulation on the formations of incense and its emissions. Herein, the emission factors (EFs) of important particulate phase toxic compounds, parent polycyclic aromatic hydrocarbons (pPAHs), alkylated PAHs (APAHs), oxygenated PAHs (OPAHs), nitro PAHs (NPAHs), and cyclohexanes were determined from the burning of the most representative types of Chinese incenses (i.e., five Nimu Tibetan incenses [NTI], one ordinary smoke incense [SI], and one smoke-free incense [SFI]). The total EFs of the quantified organic species (EF_¦²organics) for NTI was 7.44 ¡À 2.72 ¦Ìg g^-1 on average, within the levels of SI to SFI. The pPAHs showed the largest proportion (41.5%-63.7%) of the total quantified organics The total cancer risks for all examined incenses severely exceeded the health risk threshold value of 1 x 10^-4, verifying that incense burning poses certain extent damage to human health. Notably, the organic compositions of NTI and SFI burnings were similar, with lower EFs and inhalation lifetime cancer risks than SI. The present results suggest that the advanced types of incenses of NTI or SFI should be better choices than SI while the incense burning is necessary. This acts as a guide for the residents, visitors, and workers in the selections of incenses that offer lower toxic substances emissions in dwellings or temples. In addition, the high health risks for incense emissions alert the establishment of more restrictive regulations on incense production and emission are compulsory.

Atmospheric Pollution Research 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 C24H12, Safety of Coronene.

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

Jiang, Liang published the artcileA nitrogen-doped carbon modified nickel catalyst for the hydrogenation of levulinic acid under mild conditions, Related Products of catalysis-chemistry, the publication is Green Chemistry (2021), 23(18), 7065-7073, database is CAplus.

The conversion of levulinic acid (LA) to ¦Ã-valerolactone (GVL) is 1 of the most important reactions from biomass-derived platform chems. to value-added chems. N-doped C was introduced into a Ni/Al₂O₃ catalyst and was employed for the hydrogenation of LA to GVL with a full conversion and equivalent yield under mild conditions, at as low as ambient H pressure and 130¡ã for 6 h. The doping of N introduced NiNx species and the imperfection of modified N-doped C were beneficial for the selective hydrogenation of carbonyl groups. This catalyst showed excellent activity and selectivity in various solvents and could be recycled for at least 6 runs with little deactivation. In addition to LA, various substrates with both carbonyl and carboxyl groups could also be selectively hydrogenated to the corresponding lactones. This study offers both theor. foundation and practical instructions for the high-efficiency conversion of LA to GVL over nonnoble metal catalysts under mild conditions, especially ambient H₂ pressure.

Green 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 C10H10O3, Related Products of catalysis-chemistry.

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

Luo, Zai-Gang published the artcileCu(NO₃)₂-catalyzed nitrodecarboxylation of ¦Á,¦Â-unsaturated acids: facile synthesis of (E)-nitroolefins under additive-free conditions, Name: (E)-3-(3-Nitrophenyl)acrylic acid, the publication is Research on Chemical Intermediates (2016), 42(6), 6079-6087, database is CAplus.

An additive-free, facile, efficient, and ecofriendly protocol for synthesis of (E)-nitroolefins via nitrodecarboxylation of ¦Á,¦Â-unsaturated acids was developed. Cu(NO₃)₂ was used as both nitrating agent and catalyst. Furthermore, the presented methodol. offers several advantages such as easily accessible and stable substrates, inexpensive catalyst, high to excellent yield, short reaction time, and simple posttreatment procedure.

Research on Chemical Intermediates published new progress about 1772-76-5. 1772-76-5 belongs to catalysis-chemistry, auxiliary class Benzenes, name is (E)-3-(3-Nitrophenyl)acrylic acid, and the molecular formula is C9H7NO4, Name: (E)-3-(3-Nitrophenyl)acrylic acid.

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