Month: November 2022

Barbero, Margherita published the artcileSynthetic and Mechanistic Aspects of Acid-Catalyzed Disproportionation of Dialkyl Diarylmethyl Ethers: A Combined Experimental and Theoretical Study, Safety of Bis(4-fluorophenyl)methane, the publication is European Journal of Organic Chemistry (2009), 4346-4351, S4346/1-S4346/33, database is CAplus.

The disproportionation reactions of various dialkyl diarylmethyl ethers were carried out in the presence of a catalytic amount (10 mol-%) of o-benzenedisulfonimide as a Broensted acid catalyst; the reaction conditions were mild, and the yields of the diarylmethane target products were good. The catalyst was easily recovered and purified, ready to be used in further reactions. The theor. study confirmed that the reaction proceeds in two steps: The formation of a carbocation from the protonated ether followed by hydride transfer. Although the hydride transfer is the rate-determining step, it is the stability of the carbocation that determines the reaction rate and therefore the yields. (© Wiley-VCH Verlag GmbH and Co. KGaA, 69451 Weinheim, Germany, 2009).

European Journal of Organic Chemistry 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 C13H10F2, Safety of Bis(4-fluorophenyl)methane.

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

Moazezi, Mohammad Reza published the artcileHydrothermal liquefaction of Chlorella vulgaris and catalytic upgrading of product: Effect of process parameter on bio-oil yield and thermodynamics modeling, Application In Synthesis of 6972-05-0, the publication is Fuel (2022), 123595, database is CAplus.

Replacing fossil fuel sources with biofuels is one way to degrade greenhouse gas issuance. Recently, the interest, effort, and investment of researchers around the world in biofuel technol., has been focused on microalgae. The aim of the present work was focused on optimizing the biocrude yield of hydrothermal liquefaction (HTL) of Chlorella vulgaris. The effect of temperature, reaction time and the weight ratio of feedstock in different conditions of hydrothermal liquefaction process has been investigated. Optimization of bio-oil performance was done applying design expert software and response surface method (central composite design). The consequences show that the highest yield of bio-oil was obtained from Chlorella vulgaris (56.21% by weight) at 287 °C, reaction time of 40 min, and microalgae to water ratio of 0.07 Anal. of variance (ANOVA), suggests that the liquefaction temperature and reaction time plays the influential role in the bio-oil yield. Ni-Mo/Al₂O₃ was applied as catalyst for upgrading Bio-oil. The amount of sulfur in bio-oil have completely removed and HHV increased 7% (41.11 MJ/Kg) by using catalyst. Moreover, GC/MS anal. illustrates the number of nitrogenous compounds in bio-oil using Ni-Mo/Al₂O₃ was reduced, so that the amount of pyrazine was changed from 4.25% to 2.10% and pyrrole from 4.75% to 3.11%. To thermodn. modeling and predict the phase behavior of the liquefaction process, manipulation of the UNIFAC coefficients equation was model to minimize the Gibbs free energy. The theor. model had a 9.8% prediction error. This generation of bio-oils is expected to be good support for biofuels.

Fuel 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, Application In Synthesis of 6972-05-0.

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

Narayan, Rishikesh published the artcileCatalytic enantioselective synthesis of functionalized tropanes reveals novel inhibitors of hedgehog signaling, Quality Control of 4230-93-7, the publication is Angewandte Chemie, International Edition (2013), 52(49), 12892-12896, database is CAplus and MEDLINE.

We have developed a very efficient Cu(I)- catalyzed highly diastereoselective and enantioselective [3+2] cycloaddition reaction of 1,3-fused cyclic azomethine ylides and nitroalkenes. For the first time, S-shaped azomethine ylides were successfully used in an enantioselective catalytic process. This novel method provides an unprecedented and general access to functionalized tropane scaffolds that embody quaternary and tertiary stereocenters in a stereoselective manner. It allows the generation of stereochem. complex products in a single step under mild reaction conditions, and is characterized by a broad scope and versatility. Furthermore, the investigation of a tropane-inspired compound collection in a process that monitored signaling through the hedgehog pathway revealed a novel class of hedgehog-signaling inhibitors.

Angewandte Chemie, International Edition published new progress about 4230-93-7. 4230-93-7 belongs to catalysis-chemistry, auxiliary class Alkenyl,Nitro Compound,Benzene,Ether, name is 1,2-Dimethoxy-4-(2-nitrovinyl)benzene, and the molecular formula is C10H11NO4, Quality Control of 4230-93-7.

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

Hu, Jiang-Lin published the artcileRuthenium-Catalyzed Enantioselective Addition of Carboxylic Acids to Allenes, HPLC of Formula: 104-03-0, the publication is ACS Catalysis (2021), 11(19), 12301-12306, database is CAplus.

A ruthenium-catalyzed synthetic method for branched allylic esters I [R¹ = TBSO(CH₂)₂, cyclopentyl, Ph(CH₂)₂, etc.; R² = i-Pr, 2-thienyl, Ph, etc.] via addition of carboxylic acids to allenes was reported. Ligands were designed and prepared based on Josiphos skeleton, with which reaction achieved up to 95% yield and up to >99% enantiomeric excess. A deuterium labeling experiment was performed and a plausible mechanism was proposed. Enantiopure lactones of five- and six-membered ring were synthesized via a RCM reaction of branched allylic ester product.

ACS Catalysis published new progress about 104-03-0. 104-03-0 belongs to catalysis-chemistry, auxiliary class Nitro Compound,Carboxylic acid,Benzene, name is 4-Nitrophenylacetic acid, and the molecular formula is C8H7NO4, HPLC of Formula: 104-03-0.

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

Berger, Or published the artcileMussel Adhesive-Inspired Proteomimetic Polymer, Name: Fmoc-Pro-OH, the publication is Journal of the American Chemical Society (2022), 144(10), 4383-4392, database is CAplus and MEDLINE.

Herein, a synthetic polymer proteomimetic is described that reconstitutes the key structural elements and function of mussel adhesive protein. The proteomimetic was prepared via graft-through ring-opening metathesis polymerization of a norbornenyl-peptide monomer. The peptide was derived from the natural underwater glue produced by marine mussels that is composed of a highly repetitive 10 amino acid tandem repeat sequence. The hypothesis was that recapitulation of the repeating unit in this manner would provide a facile route to a nature-inspired adhesive. To this end, the material, in which the arrangement of peptide units was as side chains on a brush polymer rather than in a linear fashion as in the natural protein, was examined and compared to the native protein. Mech. measurements of adhesion forces between solid surfaces revealed improved adhesion properties over the natural protein, making this strategy attractive for diverse applications. One such application is demonstrated, using the polymers as a surface adhesive for the immobilization of live cells.

Journal of the American Chemical Society 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, Name: Fmoc-Pro-OH.

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

Mondal, Biplab published the artcileCopper Nanoclusters for Catalytic Carbon-Carbon and Carbon-Nitrogen Bond Formations, Synthetic Route of 613-33-2, the publication is ACS Applied Nano Materials (2022), 5(6), 7932-7943, database is CAplus.

Newly synthesized blue-emitting few-atom copper nanoclusters (CuNCs) have been successfully utilized for catalyzing C(sp²)-C(sp²) and C(sp²)-N(sp³) bond formations. Various substituted biphenyls and 2° aromatic amines have been synthesized in good yield using this copper catalyst at facile reaction conditions in DMSO. The amount of required nanocatalysts is as low as merely 2 mol % for carrying out these reactions. These types of copper nanoclusters are promising as potential and cheap catalysts for replacing conventional metal nanoparticles and heavy-metal-ion-based organic catalysts. The optimized structure of Cu₆(GS)₂ [GS = C₁₀H₁₆N₃O₆S] from computational studies revealed the perfect arrangements of Cu atoms in CuNCs and their interactions with stabilizing ligands. It is evident from the structure that some free Cu sites are available in the nanocluster species. These kinds of coordinatively unsaturated sites are highly active toward the catalytic reactions. Matrix-assisted laser desorption ionization-time-of-flight (MALDI-TOF) anal. also supports the computational hypothesis. Interestingly, matrix-assisted laser desorption ionization-time-of-flight mass spectrometry (MALDI-TOF MS) and computational studies revealed the formation of several reaction key intermediates in catalyzing C(sp²)-C(sp²) bond formation.

ACS Applied Nano Materials published new progress about 613-33-2. 613-33-2 belongs to catalysis-chemistry, auxiliary class Benzene, name is 4,4′-Dimethyldiphenyl, and the molecular formula is C14H14, Synthetic Route of 613-33-2.

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

Enjalbert, Delphine published the artcileSynthesis of new double-chain cationic and amphoteric F-alkylated amphiphiles derived from N-alkyl N-methyl N-[2-(F-alkyl)ethyl]amines, Related Products of catalysis-chemistry, the publication is Tenside, Surfactants, Detergents (1998), 35(4), 248-253, database is CAplus.

N-alkyl N-Me N-[2-(fluoroalkyl)] amines were prepared and quaternized by Et bromoacetate, propane-1,3-sultone, hydrogen peroxide, and α,ω-dibromoalkanes to give the resp. carboxybetaines, sulfobetaines, amine oxides, and bis-ammonium double-chain F-alkylated surfactants.

Tenside, Surfactants, Detergents 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, Related Products of catalysis-chemistry.

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

Martinetto, Yohan published the artcileSynthesis, physical properties and application of a series of new polyoxometalate-based ionic liquids, HPLC of Formula: 1949-41-3, the publication is Molecules (2021), 26(2), 496, database is CAplus and MEDLINE.

This paper deals with the preparation and the characterization of four new ionic liquids resulting from the pairing of various polyoxotungstates or polyoxomolybdates with the cation trihexyltetradecylphosphonium. The phys. properties measured by different techniques evidence that the viscosity and the rheol. behaviors of such POM-based ionic liquids, POM-ILs, strongly depend on the nature of the POM, especially its charge. Playing on the nature of the POM, we can indeed obtain Newtonian liquids or some much more viscous materials exhibiting characteristics of resins or pseudo-plastics. In a second part of this study, the potentialities of using such materials both as solvent and catalyst for the oxidation of a series of alcs. are presented as proof of concept. This part highlights great differences in strength and selectivity as a function of the POM-IL used. Furthermore, a very simple way to recycle the catalyst is also presented.

Molecules 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, HPLC of Formula: 1949-41-3.

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

Jones, Mark M. published the artcileChelate antidotes for acute nickel(II) intoxication, COA of Formula: C6H20Cl2N4, the publication is Journal of Inorganic and Nuclear Chemistry (1981), 43(7), 1705-10, database is CAplus.

Of 27 chelating agents tested, 13 were excellent antidotes for acute Ni acetate poisoning when given i.p. to mice at 10 times the Ni dose. Log K_NiX/K_CaX ratios for the effective compounds ranged from 3 to 10. Na diethyldithiocarbamate [148-18-5], effective against Ni carbonyl intoxication, was not effective against Ni(II) poisoning. A donor atom appeared essential for activity, with N and O being more effective than S. Zn diethylenetriaminepentaacetate [65229-17-6] was not effective, despite its favorable transformation stability constant, possibly due to its slow rate of transformation.

Journal of Inorganic and Nuclear Chemistry 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

Mori, Ichiro published the artcileStereoselective additions of nucleophilic alkenes to chiral thionium ions, Formula: C15H24S, the publication is Journal of Organic Chemistry (1990), 55(24), 5966-77, database is CAplus.

A convenient one-pot process has been developed for conversion of an aldehyde to an arylthionium ion which can be trapped by a nucleophilic alkene. The stereochem. of the reactions of such chiral and prochiral arylthionium ions with achiral and prochiral nucleophilic alkenes has been studied. The major adducts are those predicted by qual. application of the Cram-Felkin rule. Quant., however, the nature of the thionium aryl group has a marked effect. In reactions between prochiral thionium ions and prochiral enol silanes, good simple (anti) relative stereochem. is observed, especially with enol silane I. Mesitylthionium ions of α-chiral aldehydes react with prochiral enol silanes to give one of the four possible products in predominance. Again, however, enol silane I is found to be a superior reagent, giving II in 97% stereoisomeric purity. The α-methyl-β-arylthio ketones produced in these thionium ion reactions can be transformed by a straightforward process, which includes desulfurization, into chain compounds having anti 1,3-di-Me branches. An iterative application of this scheme can be used to prepare deoxypolypropionate structures.

Journal of Organic Chemistry published new progress about 22693-41-0. 22693-41-0 belongs to catalysis-chemistry, auxiliary class Other Functionalization Reagent, name is 2,4,6-Triisopropylbenzenethiol, and the molecular formula is C15H24S, Formula: C15H24S.

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