Catalysis-chemistry

Barden, Herbert published the artcileAcid fast staining of oxidized neuromelanin and lipofuscin in the human brain, Application of 5,9-Diaminobenzo[a]phenoxazin-7-ium acetate, the publication is Journal of Neuropathology and Experimental Neurology (1979), 38(5), 453-62, database is CAplus and MEDLINE.

Acid fast staining of the bleached residuum of substantia nigra neuromelanin and of oxidized inferior olive lipofuscin was demonstrated in paraffin and frozen sections stained with the HOAc-carbol fuchsin method of J. Barbeito-Lopez (1946) and the aldehyde fuchsin method of G. Gomori (1950). Acid fast staining occurred when sections were exposed to a prestain oxidation with KMnO₄ in conjunction with a poststain differentiation with dilute HCl. The acid fast staining with HOAc-carbol fuchsin was differentiable and in contrast to the acid fast staining with aldehyde fuchsin which was nondifferentiable. A possible histochem. basis for differentiable and nondifferentiable acid fast staining was discussed. The identity of the bleached residuum of neuromelanin as lipofuscin also was discussed.

Journal of Neuropathology and Experimental Neurology 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, Application of 5,9-Diaminobenzo[a]phenoxazin-7-ium acetate.

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

Atmaca, Ufuk published the artcileA novel approach for the synthesis of ¦Â-keto esters: one-pot reaction of carboxylic acids with chlorosulfonyl isocyanate, Recommanded Product: 3-Benzoylpropionicacid, the publication is ARKIVOC (Gainesville, FL, United States) (2020), 220-227, database is CAplus.

The ¦Â-Keto esters ArC(O)CH(COOCH₃)CH₂(CH₂)_nC(O)OCH₃ (Ar = Ph, 3,4-dimethylphenyl, 4-iodophenyl, etc.; n = 1,2) were synthesized by direct carboxylation of various 4- and 5-oxo-carboxylic acid derivatives ArC(O)CH₂(CH₂)_nC(O)OH. Addnl., optimization conditions were examined for synthesis ¦Â-keto esters. Finally, it has been found that trifluoroacetic acid is efficient in DCM under optimized conditions. This efficient one-pot novel method is very useful, fair price and easy to handle of ¦Â-keto esters.

ARKIVOC (Gainesville, FL, United States) 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, Recommanded Product: 3-Benzoylpropionicacid.

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

Anonymous published the artcileTriethylenetetramine hydrochloride morph, COA of Formula: C6H20Cl2N4, the publication is IP.com Journal (2017), 17(3A), 1-8, database is CAplus.

A process for preparation of dihydrochloride salt of triethylenetetramine or N,N’-bis(2-aminoethyl)-1,2-ethanediamine (Form T) has been disclosed. Form T is characterized by X-ray diffraction spectra, Infra-red spectra, differential scanning calorimetry (DSC) and m.p.

IP.com Journal 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 C6H20Cl2N4, COA of Formula: C6H20Cl2N4.

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

Anonymous published the artcilePhosphines as Photoinitiators, Safety of 2,6-Diisopropyl-N,N-dimethylaniline, the publication is Research Disclosure (2000), 437(Sept.), P1560-P1561, database is CAplus.

Phosphines, especially triphenylphosphine, were successfully used as photoinitiators in curing epoxy acrylate coating compositions, individually or in combination with tertiary amines or electron donors, i.e. borates.

Research Disclosure published new progress about 2909-77-5. 2909-77-5 belongs to catalysis-chemistry, auxiliary class Amine,Benzene, name is 2,6-Diisopropyl-N,N-dimethylaniline, and the molecular formula is C14H23N, Safety of 2,6-Diisopropyl-N,N-dimethylaniline.

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

Ammann, R. published the artcileIs there a critical composition of reaction products of diphenylamine stabilized nitrocellulose propellants during aging?, SDS of cas: 1821-27-8, the publication is Symposium on Chemical Problems Connected with the Stability of Explosives, [Proceedings] (1977), 9-27, database is CAplus.

Storage of nitrocellulose [9004-70-0] propellants (I) at 90¡ã with a simultaneous tracking of weight loss is described. This method leads to autocatalytic decomposition of the propellants within 1 to 2 months and allows for very sensitive differentiation between different degrees of aging. A quant. thin-layer chromatog. method is also described to determine all the nitro derivatives of the Ph2NH (DPA) [122-39-4] stabilizer, including the tetra- and N-nitroso derivatives The hypothesis that the propellants form a generally very similar critical composition of DPA reaction products was supported, that is, they begin to decompose as soon as the dinitro compounds are exhausted and the trinitro derivatives have almost completed their reaction to the higher-nitrated ones, mainly tetranitro-DPA [1330-01-4].

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 C12H9N3O4, SDS of cas: 1821-27-8.

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

Alm, Anita published the artcileMass spectra of diphenylamine compounds with nitro and nitroso substituents and of tetraphenylhydrazine, Related Products of catalysis-chemistry, the publication is Explosivstoffe (1969), 17(7), 156-64, database is CAplus.

During the decomposition of nitrocellulose in propellants, the oxides of N formed converted the stabilizer, Ph2NH, into a number of nitro and nitroso compounds, the nature and amounts of which are important in surveillance of the condition of the explosive. To assist in identification of the compounds of interest, the mass spectra of Ph2NH and 10 of its nitroso and nitro derivatives and that of N2Ph4 were determined and the spectra discussed with reference to characteristic peaks. The min. amounts required are important from a safety standpoint. A combination of thin-layer chromatog. and mass spectrometry in the anal. of mixtures in mg and ¦Ìg amounts is feasible.

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 C12H9N3O4, Related Products of catalysis-chemistry.

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

Aledo, Juan Carlos published the artcilePhylogenies from unaligned proteomes using sequence environments of amino acid residues, Recommanded Product: (S)-2-Amino-4-(methylthio)butanoic acid, the publication is Scientific Reports (2022), 12(1), 7497, database is CAplus and MEDLINE.

Alignment-free methods for sequence comparison and phylogeny inference have attracted a great deal of attention in recent years. Several algorithms have been implemented in diverse software packages. Despite the great number of existing methods, most of them are based on word statistics. Although they propose different filtering and weighting strategies and explore different metrics, their performance may be limited by the phylogenetic signal preserved in these words. Herein, we present a different approach based on the species-specific amino acid neighborhood preferences. These differential preferences can be assessed in the context of vector spaces. In this way, a distance-based method to build phylogenies has been developed and implemented into an easy-to-use R package. Tests run on real-world datasets show that this method can reconstruct phylogenetic relationships with high accuracy, and often outperforms other alignment-free approaches. Furthermore, we present evidence that the new method can perform reliably on datasets formed by non-orthologous protein sequences, i.e., the method not only does not require the identification of orthologous proteins, but also does not require their presence in the analyzed dataset. These results suggest that the neighborhood preference of amino acids conveys a phylogenetic signal that may be of great utility in phylogenomics.

Scientific Reports published new progress about 63-68-3. 63-68-3 belongs to catalysis-chemistry, auxiliary class Natural product, name is (S)-2-Amino-4-(methylthio)butanoic acid, and the molecular formula is C5H11NO2S, Recommanded Product: (S)-2-Amino-4-(methylthio)butanoic acid.

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

Alam, Todd M. published the artcileAb initio calculations of possible ¦Ã-gauche effects in the ¹³C-NMR for methine and carbonyl carbons in precise polyethylene acrylic acid copolymers, Safety of 2-Butylhexanoic acid, the publication is Molecules (2013), 9010-9020, database is CAplus and MEDLINE.

The impacts of local polymer chain conformations on the methine and carbonyl ¹³C-NMR chem. shifts for polyethylene acrylic acid p(E-AA) copolymers were predicted using ab initio methods. Using small mol. cluster models, the magnitude and sign of the ¦Ã-gauche torsional angle effect, along with the impact of local tetrahedral structure distortions near the carbonyl group, on the ¹³C-NMR chem. shifts were determined These ¹³C-NMR chem. shift variations were compared to the exptl. trends observed for precise p(E-AA) copolymers as a function acid group spacing and degree of zinc-neutralization in the corresponding p(E-AA) ionomers. These ab initio calculations address the future ability of ¹³C-NMR chem. shift variations to provide information about the local chain conformations in p(E-AA) copolymer materials.

Molecules 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, Safety of 2-Butylhexanoic acid.

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

Akdemir, Ue. published the artcileShear flocculation of fine hematite particles and correlation between flocculation, flotation and contact angle, Related Products of catalysis-chemistry, the publication is Powder Technology (1997), 94(1), 1-4, database is CAplus.

This paper presents a study on the shear flocculation of fine (38 ¦Ìm) hematite using dodecylamine acetate and Aero 801 (a mixture of petroleum sulfonate and mineral oil) as collectors. The effects of pH, collector concentration and stirrer speed were investigated. In addition, contact angle and flotation recoveries of the mineral were determined at different pH values. The results indicated that shear flocculation was possible over a wide pH range with the amine, whereas it was restricted to a narrow pH range (2.5-3.5) with Aero 801. This was attributed to the better hydrophobicity of the mineral, indicated by higher flotation recoveries and contact angles within the same ranges.

Powder Technology 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, Related Products of catalysis-chemistry.

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

Abu-Hashem, Ameen Ali published the artcileSynthesis and antimicrobial activity of new 1,2,4-triazole, 1,3,4-oxadiazole, 1,3,4-thiadiazole, thiopyran, thiazolidinone, and azepine derivatives, SDS of cas: 2051-95-8, the publication is Journal of Heterocyclic Chemistry (2021), 58(1), 74-92, database is CAplus.

The newly prepared heterocyclic compounds such as N-hydrazine-carbothioamides C₆H₅C(O)(CH₂)₂C(O)NHNHC(S)NHR (R = Ph, Bn, Et); 1,2,4-triazoles I; 1,3,4-oxadiazoles; 1,3,4-thiadiazoles II (X = O, S); 4-oxothiazolidines III [R¹ = H, Me; R² = 4-oxo-4-phenylbutanamidyl, (1-chloro-4-oxo-4-phenylbutylidene)azanyl, (1-hydrazinyl-4-oxo-4-phenylbutylidene)azanyl, 4-benzoyl-5-oxothian-2-iminyl]; pyridazine-hydrazono-thiazolidinones IV; oxothiazolidine-azepine-diones V were studied for their activities as antimicrobial. The above synthesized compounds were tested for their antimicrobial activity, and these compounds [pyridazin-hydrazono-thiazolidinones IV, oxothiazolidin-azepinediones V, N-thiazolidine-hydrazon-hydrazides III (R¹ = Me; R² = (1-hydrazinyl-4-oxo-4-phenylbutylidene)azanyl) and thiopyran-hydrazono-thiazolidinones III (R¹ = Me; R² = 4-benzoyl-5-oxothian-2-iminyl)] were considered as the most effective as antimicrobial activity.

Journal of Heterocyclic 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, SDS of cas: 2051-95-8.

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