Catalysis-chemistry

Zhang, Xiang published the artcileMechanism for Ag (I)-catalyzed decarboxylative chlorination: a DFT study, Quality Control of 1949-41-3, the publication is Theoretical Chemistry Accounts (2016), 135(6), 1-9, database is CAplus.

Ag(I)-catalyzed decarboxylative chlorination of the carboxylic acid with t-BuOCl has been given a systematic theor. study. According to the calculations, the catalytic cycle was assumed to include four steps: proton-coupled two-electron transfer, oxidative decarboxylation, formation of Ag(II)-Cl (chlorine source) and chlorine abstraction. It was first suggested that this kind of reaction is driven by the proton-coupled two-electron transfer, which leads to the formation of Ag(II) species, carboxylate, chloridion and t-BuOH. Then the oxidative decarboxylation and formation of Ag(II)-Cl take place at the same time. The resultant alkyl radical from the former abstracts the chlorine atom of Ag(II)-Cl to give the final product. Based on a comparison of the reactivities among different carboxylic acids, the oxidative decarboxylation was established as the rate-determining step. Moreover, it proceeds preferentially in a concerted dissociative electron transfer pathway.

Theoretical Chemistry Accounts published new progress about 1949-41-3. 1949-41-3 belongs to catalysis-chemistry, auxiliary class Carboxylic acid,Benzene, name is 2-Methyl-4-phenylbutanoic acid, and the molecular formula is C8H5IO, Quality Control of 1949-41-3.

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

Zhang, Heng published the artcileResearch progress in the synthesis of 4,4′-difluorodiphenylmethane, SDS of cas: 457-68-1, the publication is Youjifu Gongye (2014), 35-37, 42, database is CAplus.

A review. Physicochem. properties, spectral properties and application of 4,4′-difluorodiphenylmethane are introduced. Research progress situation in synthesis of 4,4′-difluorodiphenylmethane at home and abroad are summarized.

Youjifu Gongye 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 C3H6O2, SDS of cas: 457-68-1.

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

Yonezawa, Hidetoshi published the artcileDiscrepancy between the potency of various trypsin inhibitors to inhibit trypsin activity and the potency to release biologically active cholecystokinin-pancreozymin, Application of 2-(4-((4-Guanidinobenzoyl)oxy)phenyl)acetic acid methanesulfonic acid salt, the publication is Japanese Journal of Physiology (1984), 34(5), 849-56, database is CAplus and MEDLINE.

Injection of various trypsin??[9002-07-7] inhibitors into the lumen of the isolated perfused rat duodenum increased the amount of biol. active cholecystokinin-pancreozymin (CCK-BA) [9011-97-6] in the vascular perfusate. The potency to induce CCK-BA release of the various trypsin inhibitors diffeed. Injection of Et?p-(6-guanidinohexanoyloxy)benzoate?methanesulfonate (FOY-007) [56974-61-9] (100 ¦Ìmol); p-ethoxycarbamoylthio-6-guanidinocaproate phosphate (FOY-129) (110 ¦Ìmol); 4-(4-guanidinobenzoyloxy)phenylacetic?acid (FOY-251) [71079-09-9] (128 ¦Ìmol); N,N-dimethylcarbamoylmethyl-4-(4-guanidinobenoyloxy)phenylacetate?methanesulfonate (FOY-305) [59721-29-8] (80 ¦Ìmol); and p-aminobenzamidine-2HCl (p-ABA) [2498-50-2] (300 ¦Ìmol) caused release of CCK-BA amounting to 1042, 247, 252, 682, and 302 pM, resp. The potency to induce CCK-BA release was not correlated with the potency to inhibit trypsin activity. The present results do not support the hypothesis that a neg. feedback regulation of pancreatic enzyme secretion is exerted by intraluminal trypsin in the rat.

Japanese Journal of Physiology published new progress about 71079-09-9. 71079-09-9 belongs to catalysis-chemistry, auxiliary class Salt,Carboxylic acid,Carbamidine,Amine,Benzene,Ester,Protease,Ser/Thr Protease, name is 2-(4-((4-Guanidinobenzoyl)oxy)phenyl)acetic acid methanesulfonic acid salt, and the molecular formula is C14H10O4S2, Application of 2-(4-((4-Guanidinobenzoyl)oxy)phenyl)acetic acid methanesulfonic acid salt.

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

Yasuda, Stanley K. published the artcileIdentification of N-nitroso- and nitrodiphenylamines by two-dimensional thin-layer chromatography, Product Details of C12H9N3O4, the publication is Journal of Chromatography (1964), 14(1), 65-70, database is CAplus and MEDLINE.

By two-dimensional thin-layer chromatography on silica gel containing Zn dust, derivatives of diphenylamine (I) were separated and identified with p-diethylaminobenzaldehyde. Products from I in PBX explosives, as well as those prepared by treatment of I and 2-nitrodiphenylamine with N₂O₄, were identified. Derivatives of I studied were the 2-nitro, N-nitroso, N-nitroso-4-nitro, 2,4-dinitro, 2,4,6-trinitro, 2,4′-dinitro, 2,2′-dinitro, N-nitroso-4,4′-dinitro, N-nitroso-2-nitro, 4-nitro, N-nitroso-2,4′-dinitro, 2,4,4′-trinitro, 2,2′,4-trinitro, N-nitroso-2,2′-dinitro, 4-nitroso, 2,2′,4,4′-tetranitro, 2,2′,4,4′,6-pentanitro, 4,4′-dinitro, and 2,2′,4,4′,6,6′-hexanitro.

Journal of Chromatography 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 C21H24O8, Product Details of C12H9N3O4.

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

Volk, F. published the artcileThin-layer chromatographic determination of the lifetime of propellant powders, Category: catalysis-chemistry, the publication is Symposium on Chemical Problems Connected with the Stability of Explosives, [Proceedings] (1977), 29-53, database is CAplus.

The aging of propellants can be estimated by heating them at 65-95¡ã, followed by extraction and 2-dimensional thin-layer chromatog. of the reaction products of the stabilizers. Ph2NH [122-39-4] and Et centralite [85-98-3] gave 29 and 24 reaction products, resp. A good correlation was found between the reaction products and temperature and time, so the safe shelf life of the propellants can be estimated by short periods of heating at moderate temperature

Symposium on Chemical Problems Connected with the Stability of Explosives, [Proceedings] 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 C15H14Cl2S2, Category: catalysis-chemistry.

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

Volk, F. published the artcileDetermining the shelf life of solid propellants, SDS of cas: 1821-27-8, the publication is Propellants and Explosives (1976), 1(3), 59-65, database is CAplus.

Chromatog. anal. of propellant stabilizer reaction products is described for propellants containing diphenylamine [122-39-4], 2-nitrodiphenylamine [119-75-5], acardite I [122-39-4], acardite II [13114-72-2], and ethylcentralite [85-98-3] as a result of storage at 65-90¡ã. Aging of the propellants gives rise to stabilizer reaction products which are characteristic of the aging condition. These reaction products can be used as a criterion for different stages of aging within the shelflife of solid propellants.

Propellants and Explosives 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 C19H17N3O, SDS of cas: 1821-27-8.

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

Vermesse-Jacquinot, C. published the artcileThermodynamic and kinetic investigation of super-alkaline media. I. Solvents with waterlike electrochemical properties, Application of Bis(4-nitrophenyl)amine, the publication is Journal de Chimie Physique et de Physico-Chimie Biologique (1965), 62(2), 185-97, database is CAplus.

Acid-base measurements were carried out in solvents with dielec. constants >18, such as MeOH, EtOH, iso-PrOH, and especially ethanolamine. By spectrophotometric methods the autoprotolysis of ethanolamine was measured, and a new scale of acidity in this solvent allows acidities of the order of 19.5 to be obtained.

Journal de Chimie Physique et de Physico-Chimie Biologique 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 C14H14, Application of Bis(4-nitrophenyl)amine.

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

Uno, Taku published the artcileKidney dysfunction in Wilson disease, Quality Control of 38260-01-4, the publication is Biomedical Research on Trace Elements (1998), 9(2), 85-94, database is CAplus.

Forty-seven patients with Wilson disease were studied for their kidney dysfunction. Among them, 36 patients were not treated and 11 were treated. Over one-third of the patients revealed renal tubular abnormalities at first visit to our clinic. Such abnormalities could not explain the cause of hypouricemia in the fulminant and hemolytic anemia type of Wilson disease. Ten of 31 patients (32.3%) had nephrocalcinosis. These findings were almost completely improved following prolonged treatment with penicillamine or trientine hydrochloride. Significant microscopic hematuria was found in 21 of the 36 treated patients (58.3%) and proteinuria was found in 14 of these 36 patients (38.9%). Except for the fulminant and hemolytic anemia type of Wilson disease, dysmorphic urinary RBCs, granular and RBC casts were found on routine light microscopy in our study. These urinary findings suggest glomerular dysfunction. Besides the occurrence of local damage to the kidney or an irritant effect of copper on the glomeruli and renal tubules, we speculate that glomerular dysfunction due to liver cirrhosis should be considered, including for example, hepatic IgA glomerulonephritis.

Biomedical Research on Trace Elements published new progress about 38260-01-4. 38260-01-4 belongs to catalysis-chemistry, auxiliary class Chelating Agents, name is N1,N1′-(Ethane-1,2-diyl)bis(ethane-1,2-diamine) dihydrochloride, and the molecular formula is C10H16Br3N, Quality Control of 38260-01-4.

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

Tyrra, Wieland E. published the artcileOxidative perfluoroorganylation methods in group 12-16 chemistry The reactions of haloperfluoroorganics and In and InBr, a convenient new route to AgR_f (R_f = CF₃, C₆F₅) and reactions of AgR_f with group 12-16 elements, Recommanded Product: Trimethyl(perfluorophenyl)silane, the publication is Journal of Fluorine Chemistry (2001), 112(1), 149-152, database is CAplus.

Perfluoroiodo organics R_fI [R_f = n-C_nF_2n+1 (n = 1, 2, 3, 4, 6), i-C₃F₇, C₆F₅] and C₆F₅Br react with elemental In in polyethers or THF to give spectroscopic evidence for compounds In^IIR_fX (X = I, Br). All isolation attempts led to decomposition into In^III(R_f)₂I and In^II. In contrast, the reaction of In, 0.5Br₂ and C₆F₅Br in THF selectively and quant. yielded In(C₆F₅)Br₂¡¤2THF which was structurally characterized. The reaction of In(C₆F₅)Br₂¡¤2THF and acetylacetone (Hacac) quant. gave the distorted octahedral mol. In(acac)Br₂¡¤2THF. Perfluoroorganosilver(I) compounds Ag(R_f) (R_f = CF₃, C₆F₅) are conveniently and selectively prepared from AgF and Me₃SiR_f in several nitrile solvents. [PNP][Ag^I(CF₃)₂] ([PNP] = bis(triphenylphosphoranyliden)ammonium) is isolated from the reaction mixture after addition of one equivalent of [PNP]Cl. Using excess of [PNP]Cl, [PNP][Ag^I(CF₃)Cl] is formed which was characterized by single crystal structure anal. Besides its properties as a nucleophilic perfluoroorganylating reagent, AgR_f exhibits to be an excellent oxidative perfluoroorganylation reagent in reactions with various elements of groups 12-16 to give the corresponding perfluoroorgano element compounds in moderate to excellent yields leaving elemental Ag.

Journal of Fluorine Chemistry published new progress about 1206-46-8. 1206-46-8 belongs to catalysis-chemistry, auxiliary class Organic Silicones, name is Trimethyl(perfluorophenyl)silane, and the molecular formula is C65H82N2O18S2, Recommanded Product: Trimethyl(perfluorophenyl)silane.

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

Thuery, Pierre published the artcileUranyl-Organic Assemblies with Acetate-Bearing Phenyl- and Cyclohexyl-Based Ligands, Recommanded Product: 2,2-(1,2-Phenylenebis(oxy))diacetic acid, the publication is Crystal Growth & Design (2011), 11(1), 347-355, database is CAplus.

Six novel complexes formed under hydrothermal conditions by uranyl ions with three ligands comprising a rigid phenyl- or cyclohexyl-containing platform, and two to four acetate arms were obtained. trigonal nodes. 1,3,5-Benzenetriacetic acid (H₃BTA) yielded [NMe₄][UO₂(BTA)]¡¤H₂O (1), in which the structure-directing counterion induces a two-dimensional, bilayer-type structure different from that previously reported, with both the tris-chelating ligand and the metal ion as. Two complexes were obtained with 1,2-phenylenedioxydiacetic acid (H₂PDDA), [UO₂(PDDA)(H₂O)] (2) and [H₂DABCO][(UO₂)₂(PDDA)₃]¡¤1.5H₂O (3). Complex 2 is a simple, ribbon-like, 1-dimensional polymer, while 3 is a nanotubular assembly built around the H-bonded, structure-directing counterions. Three complexes were obtained with trans-1,2-diaminocyclohexane-N,N,N’,N’-tetraacetic acid (H₄DCTA), a polyaminopolycarboxylic acid, with different bases, [UO₂(H₂DCTA)(H₂O)₂]¡¤H₂O (4), [UO₂(H₂DCTA)(H₂O)]¡¤1.5H₂O (5), and [UO₂Na(HDCTA)(H₂O)] (6). The N atoms are not coordinated, both of them (4) or only one (5 and 6) being protonated, and the carboxylic/ate groups are monodentate, except for one chelating in 6 and one nonbonding in 4. These differences in bonding result in various assemblies, 1-dimensional in 4 and two-dimensional in 5 and 6. The layers in 5 are strongly corrugated, with the cyclohexyl groups pointing on either side, and their packing displays oval-shaped channels, while the layers in 6 are planar, with the cyclohexyl groups located on one side, and further assembled into dimeric units by the disordered Na ions. These are the 1st crystal structures of actinide ion complexes with both H₂PDDA and H₄DCTA.

Crystal Growth & Design 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 C10H13NO2, Recommanded Product: 2,2-(1,2-Phenylenebis(oxy))diacetic acid.

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