Catalysis-chemistry

Krylova, O. V. published the artcileVicarious C-amination of nitrobenzene, COA of Formula: C12H9N3O4, the publication is Russian Journal of Organic Chemistry (Translation of Zhurnal Organicheskoi Khimii) (2001), 37(6), 887-888, database is CAplus.

Aromatic amination of nitrobenzene with hydrazinium reagents [Me₃NNH₂]⁺X^– (X = Cl, Br, I) in the presence of tert-BuOK proceeded via a vicarious nucleophilic substitution of hydrogen to give p-nitroaniline and bis(p-nitrophenyl)amine.

Russian Journal of Organic Chemistry (Translation of Zhurnal Organicheskoi Khimii) 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, COA of Formula: C12H9N3O4.

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

Elkhalifa, Mahmoud published the artcileSolid-phase photochemical decarboxylative hydroalkylation of peptides, Application of Fmoc-Pro-OH, the publication is Organic Letters (2021), 23(21), 8219-8223, database is CAplus and MEDLINE.

The compatibility of photochem. with solid-phase peptide synthesis is demonstrated via photochem. hydroalkylation to form C(sp³)-C(sp³) bonds between on-resin Giese acceptors and redox-active esters. Both iridium-based photocatalysts and Hantszch ester led to high yields, with final reaction conditions producing full conversions within 30 min under ambient conditions. The chem. is compatible with a broad range of peptide side chains, redox-active esters, and resin. These conditions represent the first example of photochem. peptide modifications on resin.

Organic Letters published new progress about 71989-31-6. 71989-31-6 belongs to catalysis-chemistry, auxiliary class Amino acide derivatives,pyrrolidine, name is Fmoc-Pro-OH, and the molecular formula is C20H19NO4, Application of Fmoc-Pro-OH.

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

Karunakaran, K. published the artcileKinetics and mechanism of ruthenium(III) catalyzed oxidation of phenoxyacetic acids by lead tetraacetate, Safety of 2-(4-(tert-Butyl)phenoxy)acetic acid, the publication is Oxidation Communications (1994), 17(3-4), 274-81, database is CAplus.

The kinetics of oxidation of a number of ortho-, meta- and para-substituted phenoxyacetic acids by lead tetraacetate to yield ortho and para isomers of acetoxyphenols, has been studied. The reaction is first order each with respect to phenoxyacetic acid, lead tetraacetate, and Ru(III) and is catalyzed by hydrogen ions. The observed solvent effect suggests that the transition state is more polarized than the reactants in a S_N2 type reaction. A fairly large Hammett value (-2.29 at 35¡ãC) indicates an electron deficient transition state. The oxidation rates of ortho-substituted compounds have been analyzed in the light of the application of Taft’s steric energy parameters. A mechanism involving the existence of Ru(V) as an intermediate complex with phenoxyacetic acid, in the rate-determining step, has been proposed.

Oxidation Communications published new progress about 1798-04-5. 1798-04-5 belongs to catalysis-chemistry, auxiliary class Carboxylic acid,Benzene,Ether, name is 2-(4-(tert-Butyl)phenoxy)acetic acid, and the molecular formula is C12H16O3, Safety of 2-(4-(tert-Butyl)phenoxy)acetic acid.

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

Karunakaran, K. published the artcileKinetics of oxidation of phenoxyacetic acids by pyridinium hydrobromide perbromide, Computed Properties of 1798-04-5, the publication is Journal of Physical Organic Chemistry (1996), 9(2), 105-10, database is CAplus.

The oxidation of several monosubstituted phenoxyacetic acids by pyridinium hydrobromide perbromide (PHPB) was studied in aqueous acetic acid. The reaction is first order with respect to PHPB. Michaelis-Menten-type kinetics are observed with respect to phenoxyacetic acids. The oxidation of [2,2-²H₂]phenoxyacetic acid exhibits a substantial kinetic isotopic effect. The effect of solvent composition indicates that the transition state is more polar than the reactants. The formation constants of the intermediate phenoxyacetic acid-PHPB complexes and the rates of their decomposition were determined at different temperatures The rates of oxidation of para- and meta-substituted phenoxyacetic acids were correlated with Hammett’s substituent constants The ¦Ñ value is -2¡¤59 at 35¡ã. The rates of oxidation of ortho-substituted compounds are correlated with Charton’s triparametric equation. A mechanism involving transfer of a hydride ion from the substrate to the oxidant is proposed.

Journal of Physical Organic Chemistry published new progress about 1798-04-5. 1798-04-5 belongs to catalysis-chemistry, auxiliary class Carboxylic acid,Benzene,Ether, name is 2-(4-(tert-Butyl)phenoxy)acetic acid, and the molecular formula is C12H16O3, Computed Properties of 1798-04-5.

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

Muhammad, Amr Fatehy published the artcilePotential for upgrading El-Nakheil oil shale by froth flotation, Formula: C14H31NO2, the publication is Oil Shale (2013), 30(1), 48-59, database is CAplus.

The necessity to satisfy the increasing demand for energy and the progressive depletion of crude oil resources have renewed interest in oil shale as an alternative fuel resource. This paper aims at determining the potential for upgrading El-Nakheil oil shale, Egypt, using froth flotation. Samples were prepared by comminution followed by sieving into different size fractions. The flotation behavior of the material and extent of cleaning were studied with respect to non-ionic and ionic collectors of anionic and cationic types. The organic rich portions of samples could not be rendered sufficiently hydrophobic by the collectors used and the selectivity towards surfactant was very low.

Oil Shale 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, Formula: C14H31NO2.

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

Wakamatsu, T. published the artcileSelective flotation of quartz and feldspar using non-ionic surfactant, Computed Properties of 2016-56-0, the publication is Publications of the Australasian Institute of Mining and Metallurgy (2005), 803-805, database is CAplus.

In order to develop the HF-free flotation reagent system, the main objective of this investigation was to study the possibility of separation of quartz from feldspar using non-ionic surfactants as the collector. The non-ionic surfactants used were polyoxyethyl cetyl ether (PECE) and polyethylene glycol monocetyl ether (PGME). The flotation behavior of quartz and microcline with PECE and PGME was investigated. Each surfactant was a good selective collector for quartz with its recovery being influenced by pH and surfactant concentration Quartz is floated favorably by both types of polyoxyethylene non-ionic surfactant whereas microcline was not so much. The floatability of quartz increases as the oxyethylene length of surfactants increases. Zeta potential measurements in the system of PGME/mineral were also carried out. It was determined that in the absence of PGME the points of zero charge for quartz and microcline should be approx. at pH 2.5 and 1.8, resp. The addition of PGME to the system causes both minerals to become less neg. charged. Differences in the zeta potential value between quartz and microcline, in the presence of PGME, were detected. It can be suggested that the interaction of the oxyethylene group to the microcline surface should not be as strong as that to the quartz surface. In the mixed surfactant system of PGME and dodecylamine acetate (DAA), a small addition of DAA causes drastic enhancement of quartz flotation in the wide pH range of 1 ? 10. In the mixed surfactant system selective flotation of quartz from microcline would be anticipated at pH <3.0. The quartz floatability is thought to be as a result of the hydrophobic interaction between the adsorbed surfactant chains at the mineral-water interface.

Publications of the Australasian Institute of Mining and Metallurgy 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 C8H10O2, Computed Properties of 2016-56-0.

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

Hamdoune, Faouzia published the artcileAmphiphilic and cation-complexing compounds based on peptidoamines, Product Details of C10H6F17N, the publication is New Journal of Chemistry (2000), 24(12), 1037-1042, database is CAplus.

The synthesis of different types of amphiphilic compounds containing peptidoamine groups leads to surfactants with original properties such as the ability to coordinate metal ions. Water soluble acylcarcinine and alkylamidocarnosine surfactants are compared and the preparation of a silyloxyalkylamidocarnosine is described. The latter can be copolymerized with tetraalkoxysilanes to yield amphipathic organo-mineral solids that are also good ligands for metal cations.

New Journal of Chemistry published new progress about 30670-30-5. 30670-30-5 belongs to catalysis-chemistry, auxiliary class Polyfluoroalkanes, name is 3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,10-Heptadecafluorodecan-1-amine, and the molecular formula is C10H6F17N, Product Details of C10H6F17N.

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

Aly, Ashraf A. published the artcileTetracyanoethene and 1-Amino-1,2,2-ethenetricarbonitrile in the Synthesis of Heterocycles of Prospective Antioxidant and Antibacterial, Computed Properties of 6972-05-0, the publication is Journal of Heterocyclic Chemistry (2016), 53(3), 963-969, database is CAplus.

Reaction of 1,1,2,2-ethenetetracarbonitrile (TCNE) with aroyl thioureas in dioxane catalyzed by few drops of piperidine, led to the corresponding 1,2,4-oxathiazoles. Under the same reaction condition, thiosemicarbazide or thiosemicarbazone reacted with either TCNE or 1-amino-1,2,2-ethene-tricarbonitrile. The structures of the products were elucidated via NMR, IR, mass spectra, and elemental analyses. The mechanism of formation was discussed. Biol. (against Gram-pos. and Gram-neg. bacteria) and antioxidant activities were tested. Some of these heterocyclic compounds showed high activity as antioxidant and antibacterial compounds The structure-activity relationship was investigated.

Journal of Heterocyclic Chemistry published new progress about 6972-05-0. 6972-05-0 belongs to catalysis-chemistry, auxiliary class Thiourea,Amine,Aliphatic hydrocarbon chain,Amide, name is 1,1-Dimethylthiourea, and the molecular formula is C3H8N2S, Computed Properties of 6972-05-0.

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

Leeper, Alexandra published the artcileTorula yeast in the diet of Atlantic salmon Salmo salar and the impact on growth performance and gut microbiome, COA of Formula: C5H11NO2S, the publication is Scientific Reports (2022), 12(1), 567, database is CAplus and MEDLINE.

Atlantic salmon aquaculture is expanding, and with it, the need to find suitable replacements for conventional protein sources used in formulated feeds. Torula yeast (Cyberlindnera jadinii), has been identified as a promising alternative protein for feed and can be sustainably cultivated on lignocellulosic biomasses. The present study investigated the impact of torula yeast on the growth performance and gut microbiome of freshwater Atlantic salmon. A marine protein base diet and a mixed marine and plant protein base diet were tested, where conventional proteins were replaced with increasing inclusion levels of torula yeast, (0%, 10%, 20%). This study demonstrated that 20% torula yeast can replace fish meal without alteration to growth performance while leading to potential benefits for the gut microbiome by increasing the presence of bacteria pos. associated with the host. However, when torula yeast replaced plant meal in a mixed protein diet, results suggested that 10% inclusion of yeast produced the best growth performance results but at the 20% inclusion level of yeast, potentially neg. changes were observed in the gut microbial community, such as a decrease in lactic acid bacteria. This study supports the continued investigation of torula yeast for Atlantic salmon as a partial replacement for conventional proteins.

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, COA of Formula: C5H11NO2S.

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

Bohn, Manfred A. published the artcileKinetic modeling of the stabilizer consumption and the secondary stabilizers in a gun propellant, Recommanded Product: Bis(4-nitrophenyl)amine, the publication is International Annual Conference of ICT (1996), 96.1-96.18, database is CAplus.

Diphenylamine stabilizer (especially for solid propellants based on nitrocellulose) reacts with the decomposition products of nitrocellulose to form products with also act as stabilizers (i.e., mono-, di-, and trinitrodiphenylamines). The kinetics of these stabilizing reactions were described by various reaction schemes. The least squares fit of the calculated reaction profiles (from exptl. data of F. Volk) was used to evaluate the schemes and to derive reaction constants

International Annual Conference of ICT 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, Recommanded Product: Bis(4-nitrophenyl)amine.

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