Catalysis-chemistry

Tamaki, Airi published the artcileExamination of Pyridazine as a Possible Scaffold for Nucleophilic Catalysis, Safety of N1,N2-Dibenzylethane-1,2-diamine, the publication is Journal of Organic Chemistry (2016), 81(19), 8710-8721, database is CAplus and MEDLINE.

Pyridazines with amino groups positioned para to each aromatic ring nitrogen and fixed in six-membered rings were prepared The representative sym. amino N-Et derivative was found to slightly exceed DMAP in catalytic activity in the acetylation reaction of a tertiary alc. in C₆D₆. Nucleophilicity eclipsing that of DMAP was established in competitive reactions using phenacyl bromide as the electrophile, and the unsym. N-Et derivative was revealed to have even higher nucleophilicity.

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 C13H10F2, Safety of N1,N2-Dibenzylethane-1,2-diamine.

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

Kouchi, Zen published the artcileFunction of SYDE C2-RhoGAP family as signaling hubs for neuronal development deduced by computational analysis, SDS of cas: 63-68-3, the publication is Scientific Reports (2022), 12(1), 4325, database is CAplus and MEDLINE.

Recent investigations of neurol. developmental disorders have revealed the Rho-family modulators such as Syde and its interactors as the candidate genes. Although the mammalian Syde proteins are reported to possess GTPase-accelerating activity for RhoA-family proteins, diverse species-specific substrate selectivities and binding partners have been described, presumably based on their evolutionary variance in the mol. organization. A comprehensive in silico anal. of Syde family proteins was performed to elucidate their mol. functions and neurodevelopmental networks. Predicted structural modeling of the RhoGAP domain may account for the mol. constraints to substrate specificity among Rho-family proteins. Deducing conserved binding motifs can extend the Syde interaction network and highlight diverse but Syde isoform-specific signaling pathways in neuronal homeostasis, differentiation, and synaptic plasticity from novel aspects of post-translational modification and proteolysis.

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, SDS of cas: 63-68-3.

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

Tremblay, Luc published the artcileEffects of lipids on the sorption of hydrophobic organic compounds on geosorbents: a case study using phenanthrene, Computed Properties of 457-68-1, the publication is Chemosphere (2005), 58(11), 1609-1620, database is CAplus and MEDLINE.

The effect of the lipid fraction of natural geosorbents on the sorption of a polycyclic aromatic hydrocarbon was assessed using several experiments In the 1st set of experiments phenanthrene was sorbed on a coastal sediment as well as on its humin and humic acid fractions before and after lipid extraction Before lipid extraction, sorption shows dominantly partitioning characteristics. However, the extraction of lipids from sediment and humin drastically increases, by ¡Ü1 order of magnitude, their sorption affinity for phenanthrene at low sorbate concentrations, resulting in increased isotherm nonlinearity. This effect is less pronounced for humic acids. One mechanism proposed for the increasing sorption is that lipids, despite their very low relative abundance in the sediments, can compete with phenanthrene for specific high affinity sorption sites (e.g., matrix pores and adsorption sites). This competition is not surprising considering the similar hydrophobic nature of lipids and phenanthrene. Lipids, or any non-polar mols., could also act like plasticizers by swelling rigid domains and disrupting high affinity sites. In both cases, the removal of lipids (and extraction solvents) makes those sites available for phenanthrene. These provide alternative explanations to the previously proposed solvent conditioning effect believed to occur when geosorbents are treated with non-polar solvents modifying the matrix structure, an effect yet to be proven at mol. scale. To further study the impact of lipids on sorption, other independent experiments were performed. In a 2nd experiment, re-addition of lipids to the extracted sediment restored the sorption isotherm linearity observed in the native material supporting the absence of irreversible extraction artifacts. However, high addition of lipids (i.e., after saturation of high affinity sites) seems to also enlarge the low affinity partitioning domain. These results are consistent with dual-mode, hole-filling, sorption models involving diffusion. In the final set of experiments, solid-state ¹⁹F-NMR using F-labeled lipids sorbed onto the sediments confirmed that lipids may be in different domains (mobile or rigid) that interact or not with phenanthrene. The possible effects of lipid removal on sorption have been overlooked and should be considered when geosorbents are pretreated.

Chemosphere 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 C10H11ClO2S, Computed Properties of 457-68-1.

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

Arakawa, Youichi published the artcileAmmonium nitrate based composite solid propellant. 2. Effects of the addition of surfactants on viscosity of uncured propellant, Quality Control of 2016-56-0, the publication is Kayaku Gakkaishi (1997), 58(2), 83-88, database is CAplus.

Effects of the addition of surfactants on viscosity and shearing stress of uncured ammonium nitrate (AN) based propellant were studied. Viscosity could not be decreased by the addition of surfactants such as sodium myristate, sodium stearate and sodium linoleate. Lauryl amine was most effective for decreasing viscosity. By addition of lauryl amine, the propellant of 85 weight% AN content could be casted. Burning rate of the propellant of 85 weight% AN content was about 1.4 times bigger than that of the propellant of 81 weight% AN content.

Kayaku Gakkaishi 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, Quality Control of 2016-56-0.

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

Furusawa, Yuka published the artcilePossibility of using the tips obtained from the “Uradome” of moso bamboo (Phyllostachys pubescens) as a food source, COA of Formula: C5H11NO2S, the publication is Journal of Wood Science (2022), 68(1), 23, database is CAplus.

In the cultivation of bamboo shoots in snow-covered areas, uradome is known to prevent snow damage. Although tips can be obtained by uradome, these are currently considered unutilized. Like bamboo shoots, uradome has the potential to be a source of food. Therefore, to explore the possibility of using uradome tips as food, we evaluated their egumi and umami taste, investigated the free amino acid content, and compared these parameters with those of bamboo shoots. The results showed that the egumi taste of uradome tips was weaker than that of bamboo shoots. The umami taste at first taste was weaker than that of bamboo shoots, while the umami and richness that remained after swallowing was stronger than that of bamboo shoots. The presence of a total of 18 free amino acids was evaluated in the uradome tips and bamboo shoots, and 17 free amino acids were detected in the samples, with cystine being the exception. Eleven of these free amino acids were found to be more abundant in the uradome tips. In addition, eight of the nine essential amino acids (excluding tryptophan) were found in the uradome tips and were in approx. the same amounts as in the bamboo shoots. Furthermore, leucine, a commonly known branched-chain amino acid, was present only in the uradome tips. Overall, the results suggest that uradome tips could be used as a food source.

Journal of Wood Science 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

Bjorgaard, Josiah A. published the artcileAmplified quenching of conjugated polymer nanoparticle photoluminescence for robust measurement of exciton diffusion length, Safety of 5,9-Diaminobenzo[a]phenoxazin-7-ium acetate, the publication is Journal of Applied Physics (Melville, NY, United States) (2013), 113(20), 203707/1-203707/6, database is CAplus.

A new method for measuring exciton diffusion length in nanoparticles (NPs) of conjugated materials is presented. Cationic acceptor dyes are used to quench the photoluminescence in NPs of the prototypical conjugated polymer poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV). Amplified quenching of MEH-PPV emission is observed with an initial Stern-Volmer constant >10⁵ M^-1. Stern-Volmer plots are nonlinear with 2 distinct quenching regimes, hinting saturation of NP surfaces with acceptor mols. at some point during titration experiments Using an assumption that highly efficient quenching of excitons occurs after saturation with acceptors at the NP surfaces, the amount of maximum emission quenching can be compared with a model of exciton diffusion to determine exciton diffusion length. By assuming quenching efficiency >80%, the measured 3 dimensional exciton diffusion length is 12 ¡À 1 nm. This result is in the lower region of reported values ranging from 10 to 25 nm in MEH-PPV thin films. Both the derived model and the exptl. methodol. allow robust measurement of exciton diffusion length for any luminescent conjugated material from which NPs can be prepared (c) 2013 American Institute of Physics.

Journal of Applied Physics (Melville, NY, United States) 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, Safety of 5,9-Diaminobenzo[a]phenoxazin-7-ium acetate.

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

van der Cruijsen, Elwin A. W. published the artcileBiomolecular DNP-Supported NMR Spectroscopy using Site-Directed Spin Labeling, Computed Properties of 215297-17-9, the publication is Chemistry – A European Journal (2015), 21(37), 12971-12977, database is CAplus and MEDLINE.

Dynamic nuclear polarization (DNP) has been shown to greatly enhance spectroscopic sensitivity, creating novel opportunities for NMR studies on complex and large mol. assemblies in life and material sciences. In such applications, however, site-specificity and spectroscopic resolution become critical factors that are usually difficult to control by current DNP-based approaches. We have examined in detail the effect of directly attaching mono- or biradicals to induce local paramagnetic relaxation effects and, at the same time, to produce sizable DNP enhancements. Using a membrane-embedded ion channel as an example, we varied the degree of paramagnetic labeling and the location of the DNP probes. Our results show that the creation of local spin clusters can generate sizable DNP enhancements while preserving the intrinsic benefits of paramagnetic relaxation enhancement (PRE)-based NMR approaches. DNP using chem. labeling may hence provide an attractive route to introduce mol. specificity into DNP studies in life science applications and beyond.

Chemistry – A European Journal published new progress about 215297-17-9. 215297-17-9 belongs to catalysis-chemistry, auxiliary class Linker,PROTAC Linker, name is 2-(2-((tert-Butyldimethylsilyl)oxy)ethoxy)ethan-1-amine, and the molecular formula is C11H15NO2, Computed Properties of 215297-17-9.

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

Schaetti, Jonas published the artcileMatter-wave interference and deflection of tripeptides decorated with fluorinated alkyl chains, Safety of 3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,10-Heptadecafluorodecan-1-amine, the publication is Journal of Mass Spectrometry (2020), 55(6), e4514, database is CAplus and MEDLINE.

Studies of neutral biomols. in the gas phase allow for the study of mol. properties in the absence of solvent and charge effects, thus complementing spectroscopic and anal. methods in solution or in ion traps. Some properties, such as the static electronic susceptibility, are best accessed in experiments that act on the motion of the neutral mols. in an elec. field. Here, the authors screen seven peptides for their thermal stability and electron impact ionizability. The authors identify two tripeptides as sufficiently volatile and thermostable to be evaporated and interfered in the long-baseline universal matter-wave interferometer. Monitoring the deflection of the interferometric mol. nanopattern in a tailored external elec. field allows the authors to measure the static mol. susceptibility of Ala-Trp-Ala and Ala-Ala-Trp bearing fluorinated alkyl chains at C- and N-termini. The resp. values are 4¦Ð¦Å0 ¡Á 330 ¡À 150 ?3 and 4¦Ð¦Å0 ¡Á 270 ¡À 80 ?3.

Journal of Mass Spectrometry 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, Safety of 3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,10-Heptadecafluorodecan-1-amine.

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

Nuna, Nobumitsu published the artcileDetection of tetramethylthiuram disulfide and related compounds using the chemiluminescence of tris (2,2′-bipyridyl) ruthenium (III) cation, Related Products of catalysis-chemistry, the publication is Bunseki Kagaku (2003), 52(9), 763-767, database is CAplus.

The chemiluminescence (CL) of tris(2,2′-bipyridyl)ruthenium(III) cation was applied to the determination of tetramethylthiuram disulfide (TMTD). A sample was injected to an HPLC system with Chromolith Performance RP-18e. The eluted sample and CL reagent were mixed, and sent to a CL-detector. The detection limit of TMTD using the HPLC system was 0.15 pmol (S/N= 3). The calibration curve was linear over the injection amount range from 0.6 to 20 pmol. To improve the sensitivity of the CL method, the water that generated the background was removed from the system. As a result, the sensitivity was improved.

Bunseki Kagaku 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, Related Products of catalysis-chemistry.

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

Lutskii, A. E. published the artcileDipole moments of some substituted diphenylamines, Name: Bis(4-nitrophenyl)amine, the publication is Zhurnal Obshchei Khimii (1963), 33(3), 985-7, database is CAplus.

The following values of dipole moments (in D.) were determined from dielec. constants of solutions in C₆H₆ at 25¡ã (p,p’-dihydroxy and the nitro derivatives were examined in dioxane) in a group of substituted Ph₂NH [substituents and dipole moments (D.) shown]: 3-HO, 1.98; 4-HO, 1.95; 3-MeO, 1.70; 4-MeO, 1.79; 2,2′-(HO)₂, 3.69; 4,4′-(HO)₂, 3.50; 4,4′-HO(MeO), 2.32; 4,4′-(MeO)₂, 2.06; N,4- Ph(MeO), 2.09; N,4,4′- Ph(MeO)₂, 2.49; N,4- Ac(AcO), 4.14; N,4,4′-Ac(AcO)₂, 4.50; 2,2′-(NO₂)₂, 6.28; 4,4′(NO₂)₂, 5.13; 2,2′, 4,4′-(NO₂)₂Me(MeO), 6.47; 2,2′,4,4′-(NO₂)₂Me(MeO), 6.79. The aryl group introduced at the N atom of PhNH₂ tended to disperse the effects of conjugation of the NH₂ group among the aromatic nuclei. Diphenylamines with groups m both Ph rings showed the competing effect of these rings with the unshared electron pair of the central N atom, manifested by a neg. moment of group interaction as estimated from the dipole moments.

Zhurnal Obshchei 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, Name: Bis(4-nitrophenyl)amine.

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