Month: December 2022

Sobczak, Szymon published the artcileSqueezing Out the Catalysts: A Sustainable Approach to Disulfide Bond Exchange in Aryl Disulfides, Synthetic Route of 119-80-2, the publication is ACS Sustainable Chemistry & Engineering (2021), 9(20), 7171-7178, database is CAplus.

High-pressure conditions can be considered as an alternative, environmentally responsible way for the equilibrium reactions, such as disulfide exchange. This approach is capable of eliminating the catalysts or stimuli, such as reducing agents, strong bases, UV light, or ultrasound. The exchange of aryl disulfides in the absence of catalysts or other stimuli has been systematically studied. The effects of pressure in the range between 100 and 400 MPa, accessible in large-scale technol. installations, have been tested for promoting exchange reactions between various homodimeric aryl disulfides. For the optimized conditions, 100% yields of the heterodimer in pure single-crystal form were obtained. The reactions were performed in a diamond anvil cell, as well as in a hydraulic piston-and-cylinder press, and the products were characterized by X-ray diffraction, mass spectrometry, and NMR spectroscopy. The prominent role of high-entropy states, not attainable under ambient conditions, as well as the high-entropy nucleation, kinetic crystallization, and other effects associated with the high-pressure environment, has been demonstrated. These entropy-driven reactions represent an efficient, environmentally friendly, one-pot method for obtaining pure crystalline heterodimeric disulfides.

ACS Sustainable Chemistry & Engineering 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 C6H8O6, Synthetic Route of 119-80-2.

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

Stephan, M. published the artcileComparative study of the stabilizing effect of diphenylamine and its derivatives, Synthetic Route of 1821-27-8, the publication is Internationale Jahrestagung – Fraunhofer-Institut fuer Treib- und Explosivstoffe (1980), 237-50, database is CAplus.

A comparative study was made of the stabilizing effect of diphenylamine [122-39-4] and its derivatives on nitrocellulose [9004-70-0] propellants by heating in a vacuum and measurements of stabilizer consumption and nitrocellulose viscosity during aging. The stabilizing action of the derivatives can be classified differently for each individual test.

Internationale Jahrestagung – Fraunhofer-Institut fuer Treib- und Explosivstoffe 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 C9H9BrO2, Synthetic Route of 1821-27-8.

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

Rajakumar, Perumal published the artcileSynthesis, characterization and ion transportation studies of some novel cyclophane amides, Name: 2,2-(1,2-Phenylenebis(oxy))diacetic acid, the publication is Tetrahedron (2005), 61(22), 5351-5362, database is CAplus.

Various cyclophane amides with a large cavity have been synthesized. The structures of cyclophane amides I and II and were resolved using XRD studies. Cyclophane amide III shows a shift in ¦Ë_max in the UV/Vis. spectra when treated with Cu(II) ion as well as with Pb(II) ion. Ion transportation studies were carried out with cyclophane amide I which proved that the Na⁺ ion passes through the cavity while K⁺ ions are retained.

Tetrahedron 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, Name: 2,2-(1,2-Phenylenebis(oxy))diacetic acid.

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

Slitikov, P. V. published the artcileAminomethylation of naphthalen-2-ol and naphthalene-2,7-diol, Recommanded Product: N1,N2-Dibenzylethane-1,2-diamine, the publication is Russian Journal of Organic Chemistry (2016), 52(10), 1432-1435, database is CAplus.

Reactions of secondary aliphatic and heterocyclic diamines with formaldehyde and naphthalen-2-ol or naphthalene-2,7-diol afforded the corresponding Mannich bases I (R = H, OH; X = (CH₂)₂, (CH₂)₃; R¹ = CH₃, C₂H₅,CH₂C₆H₅). The formation of strong intramol. hydrogen bonds O-H ¡¤ ¡¤ ¡¤ N in the mols. of some products was detected by IR and ¹H NMR spectroscopy.

Russian Journal of Organic Chemistry published new progress about 140-28-3. 140-28-3 belongs to catalysis-chemistry, auxiliary class Benzenes, name is N1,N2-Dibenzylethane-1,2-diamine, and the molecular formula is C6H10O3, Recommanded Product: N1,N2-Dibenzylethane-1,2-diamine.

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

Kay, H. D. published the artcileMode of oxidation of fatty acids with branched chains. III. The fats in the body of ¦Á-methylcinnamic acid, ¦Â-phenylisobutyric acid and ¦Ã-phenylisovaleric acid, SDS of cas: 1949-41-3, the publication is Biochemical Journal (1924), 153-60, database is CAplus and MEDLINE.

The end product of C₆H₅CH:C(CH₃)COOH and of C₆H₅CH₂CH(CH₃)COOH is benzoic acid, that of C₆H₅CH₂CH₂CH(CH₃)COOH is phenylacetic acid. Acids with branched chains-as above-are oxidized as the parent acids with normal chains.

Biochemical Journal 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 C11H14O2, SDS of cas: 1949-41-3.

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

Rao, N. Venkateswara published the artcileCerimetric estimation of ascorbic acid using different indicators, Quality Control of 10510-54-0, the publication is Indian Journal of Pharmaceutical Sciences (1978), 40(4), 128-9, database is CAplus.

Methods for the cerimetric titration of ascorbic acid [50-81-7] in com. tablets and syrups using 9 azine and oxazine dyes, Lissamine Blue BF [6448-97-1], Brilliant Cresyl Blue [4712-70-3], Capri Blue [1787-57-1], Solochrome Prune AS [6416-51-9], Gallamine Blue [1563-02-6], Celestine Blue [1562-90-9], Meldola’s Blue [7057-57-0], Cresyl Fast Violet Acetate [10510-54-0], Resazurin [550-82-3] as redox indicators were developed.

Indian Journal of Pharmaceutical Sciences published new progress about 10510-54-0. 10510-54-0 belongs to catalysis-chemistry, auxiliary class Other Aromatic Heterocyclic,Salt,Amine,Inhibitor,Inhibitor, name is 5,9-Diaminobenzo[a]phenoxazin-7-ium acetate, and the molecular formula is C18H15N3O3, Quality Control of 10510-54-0.

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

Vidyadhar, A. published the artcileMechanisms of Amine-Quartz Interaction in the Absence and Presence of Alcohols Studied by Spectroscopic Methods, Recommanded Product: Dodecylamineacetate, the publication is Journal of Colloid and Interface Science (2002), 256(1), 59-72, database is CAplus.

The adsorption mechanism of long-chain alkylamines and their acetate salts on quartz was investigated using Hallimond flotation, zeta-potential, Fourier transform IR, and XPS studies at neutral pH 6-7. The influence of long-chain alcs. on the adsorption of amines in mixed amine-alc. on quartz was also examined It is shown by IR spectroscopy that in differentiation to the electrostatic adsorption model of Gaudin-Fuerstenau-Somasundaran, amine cations form strong hydrogen bonds with the surface silanol groups. The XPS spectra revealed the presence of neutral amine mols. together with protonated ammonium ions at and above the critical hemimicelle concentration The acetate counterions were found to influence the amine adsorption. Possible mechanisms of adsorption based on these observations were discussed. For the first time it was proved spectroscopically that coadsorption of long-chain alcs. along with amine cations leads to formation of a closely packed surface layer, as compared to the case of adsorption of pure amine alone at the same concentration The highest order and packing at the surface are observed when the alkyl chain length of mixed amine and alc. are the same. The condition of same chain length of amines and alcs. adsorbing at the surface corresponds to maximum flotation recovery. The results also confirmed the synergistic enhancement of amine adsorption in the presence of alcs. The mechanism for mixed long-chain amine and alc. adsorption onto quartz is consistent with the primary adsorption species of alkylammonium-water-alc. complex, where deprotonation of ammonium groups in the adsorbed layer leading to two-dimensional precipitation of mol. amine was illustrated.

Journal of Colloid and Interface Science 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 C44H28ClFeN4, Recommanded Product: Dodecylamineacetate.

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

Vidyadhar, A. published the artcileMechanisms of amine-feldspar interaction in the absence and presence of alcohols studied by spectroscopic methods, Application In Synthesis of 2016-56-0, the publication is Colloids and Surfaces, A: Physicochemical and Engineering Aspects (2003), 214(1-3), 127-142, database is CAplus.

The adsorption of long-chain primary amines on feldspars at neutral pH 6-7 was investigated using Hallimond flotation, zeta-potential, FT-IR and XPS studies. Two-dimensional (2D) followed by three-dimensional (3D) precipitation mechanism of amine adsorption on quartz reported earlier (Langmuir 16 (2000) 8071) was further substantiated. The orientation and packing of dodecyl- and hexadecylammonium acetate and chloride adsorbed on albite in the different regions of the adsorption isotherm were determined It was shown that these characteristics depend strongly on the substrate. The influence of long-chain alcs. on the adsorption of amines in mixed amine/alc. on feldspars, i.e. albite (NaAlSi₃O₈) and microcline (KAlSi₃O₈), was also examined Coadsorption of the counterion was not revealed, but the counterion was found to affect indirectly the adsorption at concentrations above the concentration of the bulk amine precipitation It was proved spectroscopically that co-adsorption of long-chain alcs. along with amine cations leads to formation of a closed packed surface layer as compared to the case of adsorption of pure amine alone at the same concentration The highest order and packing at the surface were observed when the alkyl chain length of mixed amine and alc. were the same. The condition of same chain length of amines and alcs. adsorbing at the surface corresponded to maximum flotation recovery. The results also confirmed the synergistic enhancement of amine adsorption in the presence of alcs. A mechanism of mixed long-chain amine and alc. adsorption onto silicates (albite and quartz) consistent with the primary adsorption species of alkylammonium-water-alc. complex, where deprotonation of ammonium groups in the adsorbed layer leading to 2D precipitation of mol. amine was illustrated.

Colloids and Surfaces, A: Physicochemical and Engineering Aspects 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 C12H15ClO3, Application In Synthesis of 2016-56-0.

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

Chernyshova, I. V. published the artcileMechanism of adsorption of long-chain alkylamines on silicates: A spectroscopic study. 2. Albite, SDS of cas: 2016-56-0, the publication is Langmuir (2001), 17(3), 775-785, database is CAplus.

Using FTIR (DRIFTS and IRRAS) and XPS spectroscopy, ¦Æ potential measurements, and Hallimond flotation tests, it was confirmed that long-chain primary amines are adsorbed on silicates at pH 6-7 through the 2D-3D precipitation mechanism. The orientation and packing of dodecyl- and hexadecylammonium acetate and chloride adsorbed on albite in the different regions of the adsorption isotherm were determined These characteristics depend strongly on the substrate. Coadsorption of the counterion was not revealed, but the counterion was found to affect indirectly the adsorption at concentrations above the concentration of the bulk amine precipitation

Langmuir 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 C14H31NO2, SDS of cas: 2016-56-0.

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

Chernyshova, I. V. published the artcileMechanism of Adsorption of Long-Chain Alkylamines on Silicates. A Spectroscopic Study. 1. Quartz, Computed Properties of 2016-56-0, the publication is Langmuir (2000), 16(21), 8071-8084, database is CAplus.

The mechanism of adsorption of long-chain alkylamines at pH 6-7 onto quartz was studied using FTIR and XPS spectroscopy. The spectroscopic data were correlated with ¦Æ potential and Hallimond flotation results. For the 1st time (1) amine cation in the 1st monolayer is H-bonded with surface silanol group and this H-bond becomes stronger after the break in the adsorption characteristics (isotherm, ¦Æ potential, floatability); (2) at the break the origin of the adsorbed amine species changes qual., and along with alkylammonium ion attached to deprotonated silanol group, mol. amine appears at the surface and, as a result, monolayer thick patches of well-oriented and densely packed adsorbed amine species form rendering the surface highly hydrophobic; and (3) at higher amine concentration, bulk precipitation of mol. amine takes place. The counterion influences both these steps. A model of successive two-dimensional and three-dimensional precipitation was suggested to explain amine adsorption on a silicate surface.

Langmuir 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 C14H31NO2, Computed Properties of 2016-56-0.

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