Catalysis-chemistry

Zhang, Xiao-ping published the artcileHydrophobic aggregation of ultrafine kaolinite, SDS of cas: 2016-56-0, the publication is Journal of Central South University of Technology (English Edition) (2008), 15(3), 368-372, database is CAplus.

The hydrophobic aggregation of ultrafine kaolinite in cationic surfactant suspension was investigated by sedimentation test, zeta potential measurement and SEM observation. SEM images reveal that kaolinite particles show the self-aggregation of edge-face in acidic media, the aggregation of edge-face and edge-edge in neutral media, and the dispersion in alk. media due to electrostatic repulsion. In the presence of the dodecylammonium acetate cationic surfactant and in neutral and alk. suspension, the hydrophobic aggregation of face-face is demonstrated. The zeta potential of kaolinite increases with increasing the concentration of cationic surfactant. The small and loose aggregation at a low concentration but big and tight aggregation at a high concentration is presented. At pH = 7 alkyl quarterly amine salt CTAB has the best hydrophobic aggregation among three cationic surfactants, namely, dodecylammonium acetate, alkyl quarterly amine salts 1227 and CTAB.

Journal of Central South University of Technology (English Edition) 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 C10H18O, SDS of cas: 2016-56-0.

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

Zhang, Jian-feng published the artcileQuantum chemical calculation on properties of phenoxy acetic acids depressants, COA of Formula: C10H10O6, the publication is Zhongguo Youse Jinshu Xuebao (2004), 14(8), 1437-1441, database is CAplus.

Quantum chem. of phenoxy acetic acids depressants was studied at B3LYP/6-31G^* level by d. functional theory (DFT). The ratio of bond charge d. (¦Ñ(O-H)/¦Ñ(C-O)) for dissociating carboxylic group in each reagent was put out as the judgment for dissociation extent. Frontier orbital energy calculation of the reagents and their corresponding univalence anions approved the traditional theory that mols. in lower ¦¤E_HOMO-LUMO has greater reactivity, and that univalence anion in lower HOMO energy causes greater reactivity with active metal ion on the mineral surface. Energy variation between the univalence anion and the mineral surface reveals that such reagents make intensive adsorption on the surface of calcite and diaspore.

Zhongguo Youse Jinshu Xuebao 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 C8H17Br, COA of Formula: C10H10O6.

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

Zhang, Jian-feng published the artcilePhase transfer catalyzed synthesis and flotation performance of isomers of biphenoxyl bi(acetic acid), COA of Formula: C10H10O6, the publication is Zhongguo Youse Jinshu Xuebao (2001), 11(4), 707-711, database is CAplus.

In the presence of tributylethylammonium ethylsulfate as a phase-transfer catalyst, three isomers of biphenoxyl bi(acetic acid) (I) are synthesized from biphenol, chloroacetic acid and sodium hydroxide in a chloroform solvent. The flotation depressing performance of I for calcite, diaspore and pyrite was studied. I possesses a depressing ability to the three minerals in the order calcite > diaspore > pyrite. I can be used as an efficient depressant for calcite and diaspore. Electronegativity of the group, reagent specific exponent and HLB of I are discussed. Quantum calculations were done by using the Mopac method on an MSI workstation which explained the depressing mechanism and structure-performance relations of the synthesized flotation depressants.

Zhongguo Youse Jinshu Xuebao 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 C8H17Br, COA of Formula: C10H10O6.

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

Zhang, Jian-feng published the artcileFlotation depression of calcite by phenoxy carboxylic acid, Application of 2,2-(1,2-Phenylenebis(oxy))diacetic acid, the publication is Zhongnan Gongye Daxue Xuebao, Ziran Kexueban (2001), 32(2), 146-149, database is CAplus.

A new type of flotation reagents, phenoxy-containing (acetic acid compounds), were prepared by treating phenol or a polyphenol, such as dihydroxybenzene and v-trihydroxybenzene, with chloroacetic acid in an alkali solution Controlling the reaction pH value and developing a new self-sealing method brought about a good synthesizing result with high yield and selectivity. It has been shown that the synthesized chems., especially the product of pyrogallol and gallic acid reacting with chloride acetic acid, act as effective depressants in the flotation of calcite. When sodium oleate with 1 x 10^-4 mol/L is used as a collector, calcite can be completely depressed when the concentration of two chems. is 4 x 10^-5 mol/L and 5 x 10^-5 mol/L at pH value 8.78 and 8.47, resp. The electronegativity of group, reagent specific exponent and HLB are discussed, which have explained the depressing mechanism and structure-property relationship of the synthesized chems.

Zhongnan Gongye Daxue Xuebao, Ziran Kexueban 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 C9H12O3S, Application of 2,2-(1,2-Phenylenebis(oxy))diacetic acid.

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

Zhang, Jian-Feng published the artcileDetermination and quantum chemical calculation of the acid dissociation constants of some phenoxy acetic acids, SDS of cas: 5411-14-3, the publication is Yingyong Huaxue (2004), 21(8), 766-769, database is CAplus.

The acid dissociation constants of seven phenoxy acetic acids were determined by potentiometric titration It has been shown that phenoxy acetic acids exhibit stronger acidity than both acetic acid and benzoic acid due to the induction and conjugation of the oxygen atom on -OCH₂COOH that links to the benzene ring. Acidity of phenoxy acetic acids containing two or more -OCH₂ COOH groups is lower than that of phenoxy acetic acid by reason of electron donation of oxygen atom to the benzene ring. Quantum chem. calculation of the phenoxy acetic acids was carried out using CNDO/2 method. The bond charge d.(¦Ñ) of 0-H and C-O bond in carboxyl group of seven phenoxy acetic acids was calculated, and the value f=¦Ñ_O-H/¦Ñ_C-C, was figured out. The f value of the carboxyl group in phenoxy acetic acid as well as the f values of the most likely dissociated carboxyl group in other six phenoxyl acetic acid derivatives are changed in the corresponding change order of their pK_a or pK_a1 values. It is concluded that the f value can be used as a judgement criterion of relative acidity for phenoxy acetic acids.

Yingyong Huaxue 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 C6H8O3, SDS of cas: 5411-14-3.

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

Cui, Liu published the artcileRuthenium(II) complexes bearing chelating Carboxylate-anchored normal and abnormal Carbenes: Synthesis, characterizations and catalytic applications, Related Products of catalysis-chemistry, the publication is Polyhedron (2022), 115593, database is CAplus.

Functionalized abnormal/mesoionic NHC (NHC = N-heterocyclic carbene) complexes have been much less investigated in contrast to their normal NHC counterparts. In this work, a series of [C_carbene?_carboxylate]- and [C_carbene?’_phenyl]-type Ru(II) complexes bearing normal and abnormal NHCs have been synthesized. Their spectroscopic features, solid-state structure and aquation reactivity have also been reported. All the as-synthesized complexes have served as precatalysts to catalyze intramol. or intermol. carboxylic acid-to-alkyne addition reactions. It was found that the catalytic behavior of abnormal NHC complexes is superior to that of the normal NHC analogs. An anti-Markovnikov addition reactivity, leading to the formation of an E-type enol ester as the major product, was observed A few stoichiometric experiments have also been carried out to provide preliminary insight into the catalytic mechanism.

Polyhedron 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, Related Products of catalysis-chemistry.

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

Jiang, Yang published the artcileImproved synthesis and low-temperature performance of a series of saturated ¦Á-branched fatty acids, Recommanded Product: 2-Butylhexanoic acid, the publication is Chemical Papers (2017), 71(12), 2359-2363, database is CAplus.

Five saturated ¦Á-branched fatty acids, also known as Guerbet acids, including ¦Á-propylhexyl acid (G₁), ¦Á-butylhexyl acid (G₂), ¦Á-propyloctyl acid (G₃), ¦Á-butyloctyl acid (G₄), and ¦Á-hexyloctyl acid (G₅), were synthesized in high yields by four-step reaction. Colorless, almost odorless, and oily products were obtained with high purity, whose structures were confirmed by GC, ¹H/¹³C NMR, and ESI-MS characterization. G₁, G₃, and G₄ had pour points lower than -60 ¡ãC, while G₂ and G₅ showed higher pour points (-42 ¡ãC and 6 ¡ãC, resp.) because of their mol. symmetry. Considering the low-temperature properties, G₁, G₃, G₄, and even G₂ held great potential applications in the lubricant and oilfield.

Chemical Papers 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 C10H20O2, Recommanded Product: 2-Butylhexanoic acid.

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

Xu, Nan published the artcileChemical characteristics and sources of organic aerosols across the Taiwan Strait, Formula: C24H12, the publication is Atmospheric Pollution Research (2022), 13(2), 101312, database is CAplus.

Although increasing attention is drawn to particulate air pollution across the Taiwan Strait, few studies have focused on the organic component, which comprises a large portion in ambient aerosols. Synchronous observations were conducted at seven sites in Taiwan and Fujian to explore the chem. properties and source contributions of organic aerosols across the Taiwan Strait. In total, 134 organic matters were quantified by gas chromatog.-mass spectrometry. Compared to other areas in China, the proportions of n-alkanes and PAHs in the quantified organic constituent were relatively lower across the Taiwan Strait, with alkanoic acids and dicarboxylic acids higher, indicating less primary source contribution and more secondary formation influence. The chem. mass balance (CMB) model showed that cooking and vehicle emissions were the richest primary sources of organic carbon (OC) across the Taiwan Strait, accounting for 21% and 15% on average, followed by biomass burning and vegetative detritus. Coal burning had little influence in early summer across the Taiwan Strait. The percentages of diesel vehicle contributions were higher at sites in Taiwan than in Fujian, which was also verified by a higher elemental carbon (EC) to OC ratio. The contribution of biomass burning increased significantly when large amounts of fire points observed across the Taiwan Strait. This work highlights the chem. characteristics of organic aerosols and the interaction of particulate air pollution across the Taiwan Strait in a typical monsoon transition case. Sources of OC and potential origin areas of PM2.5 were also investigated to support cross-strait pollution control policies.

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 C3H8N2S, Formula: C24H12.

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

Wang, Shanyu published the artcileChanges in lipid profiles and volatile compounds of shrimp (Penaeus vannamei) submitted to different cooking methods, Synthetic Route of 6217-54-5, the publication is International Journal of Food Science and Technology (2022), 57(7), 4234-4244, database is CAplus.

Herein, the effect of three common cooking methods (boiling, baking and microwaving) on lipids and volatile compounds in shrimp (Penaeus vannamei) was assessed. The results revealed that contents of phospholipid, triglyceride, cholesterol and free fatty acids in the cooked shrimp significantly declined when compared to the raw shrimp. And these decreases occurred especially in the boiling and microwaving treatment. Among free fatty acids, the contents of palmitic acid (C16:0), oleic acid (C18:1n9c) and linoleic acid (C18:2n6c) also decreased greatly in the boiled and microwaved shrimp, while EPA and DHA enhanced in each cooked group (P < 0.05). Furthermore, microwaved samples exhibited higher levels of oxidation parameters, such as acid value (AV) and thiobarbituric acid-reactive substances (TBARS). For volatile compounds, a total of 31 volatile compounds were detected by GC-IMS, and these contents increased after cooking. Aliphatic volatile compounds, including 1-octen-3-one, pentane-1-ol, 1-propanol, octanal, heptanal, pentanal and hexanal, were main flavor contributors in cooked shrimp, with higher contents observed in microwaved shrimp. In addition, the correlation anal. showed that linoleic acid was a substrate for 15 volatile compounds of cooked shrimp meat. These results indicate that microwave cooking exerts more influences on lipid profiles in shrimp and consequently caused more volatile compounds

International Journal of Food Science and Technology 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 C6H8O6, Synthetic Route of 6217-54-5.

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

Wen, Yixian published the artcileExposure to two-dimensional ultrathin Ti3C2 (MXene) nanosheets during early pregnancy impairs neurodevelopment of offspring in mice, Quality Control of 6217-54-5, the publication is Journal of Nanobiotechnology (2022), 20(1), 108, database is CAplus and MEDLINE.

Two-dimensional ultrathin Ti3C2 (MXene) nanosheets have been extensively explored for various biomedical applications. However, safety issues and the effects of Ti3C2 on human health remain poorly understood. To explore the influence on fetal or offspring after exposure to Ti3C2 nanosheets, we established a mouse model exposed to different doses of Ti3C2 nanosheets during early pregnancy in this study. We found that Ti3C2 nanosheets had negligible effect on the reproductive ability of maternal mice, including average pregnancy days, number of new-borns, and neonatal weight, etc. Unexpectedly, abnormal neurobehavior and pathol. changes in the cerebral hippocampus and cortex in adult offspring were observed following Ti3C2 nanosheet treatment. In further studies, it was found that Ti3C2 exposure led to developmental and functional defects in the placenta, including reduced area of labyrinth, disordered secretion of placental hormones, and metabolic function derailment. The long-chain unsaturated fatty acids were significantly higher in the placenta after Ti3C2 exposure, especially docosahexaenoic acid (DHA) and linoleic acid. The metabolic pathway anal. showed that biosynthesis of unsaturated fatty acids was upregulated while linoleic acid metabolism was downregulated. These developmental and functional defects, particularly metabolic function derailment in placenta may be the cause for the neuropathol. in the offspring. This is the first report about the effects of Ti3C2 nanosheet exposure on pregnancy and offspring. The data provides a better understanding of Ti3C2 nanosheets safety. It is suggested that future studies should pay more attention to the long-term effects of nanomaterials exposure, including the health of offspring in adulthood, rather than only focus on short-term effects, such as pregnancy outcomes. Metabolomics could provide clues for finding the prevention targets of the biol. neg. effect of Ti3C2 nanosheets.

Journal of Nanobiotechnology 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 C21H37BO, Quality Control of 6217-54-5.

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