Tag: M.W=200-250

Qian, Xin published the artcileCatalytic double C-Cl bond activation in CH₂Cl₂ by iron(III) salts with Grignard reagents, Computed Properties of 457-68-1, the publication is Synlett (2011), 852-856, database is CAplus.

Cross-coupling of Grignard reagents with dichloromethane is achieved using iron(III) catalysts. Aryl- and benzyl-magnesium bromides show a range of activity toward double C-Cl bond activation resulting in the insertion of methylene fragments between two equivalent of the nucleophilic partner.

Synlett 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, Computed Properties of 457-68-1.

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

Piela, Katarzyna published the artcileLow temperature emission spectra of optically nonlinear N-benzyl-2-methyl-4-nitroaniline crystal, Recommanded Product: N-Benzyl-2-methyl-4-nitroaniline, the publication is Chemical Physics (2012), 28-32, database is CAplus.

The fluorescence and phosphorescence spectra of N-benzyl-2-methyl-4-nitroaniline (BNA) orthorhombic crystal were measured between 5 and 200 K. The fluorescence spectrum of BNA in a Shpol’skii matrix of n-heptane was also recorded at 5 K. The electronic absorption spectra parameters such as singlet and triplet state energies, dipole moments and oscillator strengths were calculated by semi-empirical and TD DFT methods. The calculated energies of singlet and triplet states and electronic transitions in the BNA mol. were compared with the exptl. results. The phosphorescence decay time was estimated to be 270 ms at 5 K. It is presumed that the disappearance of vibronic structure above 30 K observed in the fluorescence spectra is caused by the nitro group vibrations while the structured phosphorescence originates from the trap states. The role of mol. shape towards emission processes in BNA crystal in terms of structure-property relationship is discussed.

Chemical Physics published new progress about 201157-13-3. 201157-13-3 belongs to catalysis-chemistry, auxiliary class Nitro Compound,Amine,Benzene, name is N-Benzyl-2-methyl-4-nitroaniline, and the molecular formula is C14H14N2O2, Recommanded Product: N-Benzyl-2-methyl-4-nitroaniline.

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

Levin, Vitalij V. published the artcileNucleophilic fluoroalkylation of iminium salts, Quality Control of 1206-46-8, the publication is Tetrahedron Letters (2008), 49(19), 3108-3111, database is CAplus.

Iminium cations generated by the coupling of aldehydes, N-trimethylsilylamines and TMSOTf or by the methylation of imines with MeOTf smoothly react with silanes of a general formula Me₃SiR_f (R _f = CF₃, CCl₂F, C₆F₅) to afford the corresponding tertiary amines having a fluorinated substituent. The key step, involving C-C bond formation, is promoted by NaOAc or KF in DMF as a solvent.

Tetrahedron Letters published new progress about 1206-46-8. 1206-46-8 belongs to catalysis-chemistry, auxiliary class Organic Silicones, name is Trimethyl(perfluorophenyl)silane, and the molecular formula is C9H9F5Si, Quality Control of 1206-46-8.

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

Csiba, I. published the artcileSolubilization properties of some water-soluble aryl alkyl ether derivatives. I. Preparation and solubilization properties of aryloxyacetic acids, SDS of cas: 1798-04-5, the publication is Cesko-Slovenska Farmacie (1968), 17(1), 28-33, database is CAplus and MEDLINE.

Aryloxyacetic acids of the general formula I were prepared by heating a mixture of the appropriate Na phenolate (II) and ClCH2CO2H on a boiling water bath, and extracting the reaction mixture with Et2O and saturated NaHCO3 solution In cases when II was not soluble, EtOH was added to the reaction mixture I prepared were (R1, R2, R3, R4, R5, % yield, and m.p. given): H, Me, H, H, H, 71.9, 101¡ã; H, H, Me, H, H, 72.3, 125¡ã; Et, H, H, H, H, 51.5, 138-40¡ã; NO2, H, H, H, H, 25, 152¡ã; H, H, NO2, H, H, (Ia), 50.1, 182¡ã; H, H, Cl, H, H, 61.5, 158-9¡ã; H, H, tert-Bu, H, H, (IIb), 54.2, 86¡ã; H, H, tert-C8H17, H, H (IIc), 48.3, 106-8¡ã; Ph, H, H, H, H, 28.8, 98-100¡ã; OMe, H, H, H, H, 68.3, 128¡ã; H, OMe, H, H, H, 54.5, 114-15¡ã; H, H, OMe, H, H, 35, 110-12¡ã; EtCO, H, H, H, H, 22.2, 127-9¡ã; H, H, EtCO, H, H, 61.5, 125-7¡ã; Me, Me, H, H, H, 60, 160; Me, H, Me, H, H, 48.6, 140¡ã; Me, H, H, Me, H, 34.5, 118¡ã; Cl, H, Cl, H, H, 56, 138-9¡ã; Me, H, H, iso-Pr, H, 53.8, 149¡ã; iso-Pr, H, H, Me, H, 62.4, 148¡ã; OMe, H, H, CHO, H, 57.5, 175-7¡ã; H, OMe, H, OMe, H, 32.6, 143-4¡ã; Me, H, Me, H, H, 76, 117¡ã; Cl, H, Cl, H, Cl, 49.3, 153-4¡ã; H, Me, Cl, Me, H, 54, 148-5¡ã. Ia (40 g.) and 394.86 g. FeSO4¡¤7H2O in 310 ml. 25% NH4OH was refluxed, and the mixture acidified with AcOH to give 66% I (R1 = R2 = R4 = R5 = H, R3 = NH2), m. 220-2¡ã. Na, K, or Li salts of I were prepared by treating an alc. solution of the appropriate I with alc. metallic hydroxide or alcoholate. Solubility of caffeine and (or) 8-methylcaffeine in solutions of I alkali salts was determined I with substituents having +I and +M effects had higher dissolution power than unsubstituted PhOCH2CO2H (III). IIb, and IIc, resp. acted as surfactants but their dissolution power was lower than that of III.

Cesko-Slovenska Farmacie 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, SDS of cas: 1798-04-5.

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

Drozdov, V. A. published the artcileAcid-base properties of alkyl(aryl)fluorosilanes in nonaqueous media, Computed Properties of 312-40-3, the publication is Zhurnal Obshchei Khimii (1970), 40(1), 104-9, database is CAplus.

Conventional syntheses gave the following: Me2EtSiF, b. 51¡ã, d20 -, n20D – (n15D 1.3570); Me2PrSiF, b. 77¡ã, -, 1.3708; Me2PhSiF, b. 155-7¡ã, -, 1.5471; (PhCH2)SiMe2F, b98 104¡ã, 0.9743, 1.4838; MeEt(PhCH2)SiF, b. 200-2¡ã, 0.9663, 1.4792; MePh(PhCH2)SiF, b. 117¡ã, 1.0610, 1.5481; MePh2SiF, b43 164.5¡ã, 1.077, 1.5482; Et3SiF, b. 109-10¡ã, 0.8392, 1.3906; Et2PhSiF, b8 77-8¡ã, 0.9837, 1.4880; Et2(PhCH2)SiF, b95 96¡ã, 0.9828, 1.4942; PhSiFCl2, b. 157-9¡ã, -, 1.5293; Ph2SiFCl, b10 131-2¡ã, -, 1.5471; MePhSiF2, b4 108-10¡ã, 1.2000, 1.5339; PhSiF2Cl, b. 129-30¡ã, -, 1.4575; PhSiF3, b. 102-3¡ã, 1.2270, 1.4106; and PhSiCl3, b100 225¡ã, 1.2220, 1.5821; also: MePh2SiCl, b45 191¡ã; MePhSiCl2, b100 223-5¡ã; MePh(PhCH2)SiCl, b. 149¡ã; Me2PhSiCl, b. 190-1¡ã; and Et2PhSiCl, b9 100-2¡ã. Ir spectral curves of 12 of these were shown and their thermodynamic acidity was determined by potentiometric titration in dry MeOH and EtOH relative to dry HCl in the same solvents. The relative values of such acidity expressed in units of pK (-SiR3) were, in MeOH and EtOH, resp.: Et3SiF, 10.9, 10.0; MeEt(PhCH2)-SiF 10.2, 9.56; Me2PhSiF 9.55, 9.14; MePh(PhCH2)SiF, 9.29, 8.80; and Me3SiF, 10.43, 9.69. Unlike chlorosilanes, the sub-stituent groups had considerable effect on the acidity of the fluorosilanes. This is ascribed to the low polarizability of these.

Zhurnal Obshchei Khimii published new progress about 312-40-3. 312-40-3 belongs to catalysis-chemistry, auxiliary class Organic Silicones, name is Difluorodiphenylsilane, and the molecular formula is C12H10F2Si, Computed Properties of 312-40-3.

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

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

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

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

Broemmel, Kathrin published the artcileSynthesis and biological evaluation of PET tracers designed for imaging of calcium activated potassium channel 3.1 (K_Ca3.1) channels in vivo, Application of Bis(4-fluorophenyl)methane, the publication is RSC Advances (2021), 11(48), 30295-30304, database is CAplus and MEDLINE.

Expression of the Ca²⁺ activated potassium channel 3.1 (K_Ca3.1) channel (also known as the Gardos channel) is dysregulated in many tumor entities and has predictive power with respect to patient survival. Therefore, a positron emission tomog. (PET) tracer targeting this ion channel could serve as a potential diagnostic tool by imaging the K_Ca3.1 channel in vivo. It was envisaged to synthesize [¹⁸F]senicapoc ([¹⁸F]1) since senicapoc (1) shows high affinity and excellent selectivity towards the K_Ca3.1 channels. Because problems occurred during ¹⁸F-fluorination, the [¹⁸F]fluoroethoxy senicapoc derivative [18F]28 was synthesized to generate an alternative PET tracer targeting the K_Ca3.1 channel. Inhibition of the K_Ca3.1 channel by 28 was confirmed by patch clamp experiments In vitro stability in mouse and human serum was shown for 28. Furthermore, biodistribution experiments in wild type mice were performed. Since [18F]fluoride was detected in vivo after application of [¹⁸F]28, an in vitro metabolism study was conducted. A potential degradation route of fluoroethoxy derivatives in vivo was found which in general should be taken into account when designing new PET tracers for different targets with a [¹⁸F]fluoroethoxy moiety as well as when using the popular prosthetic group [¹⁸F]fluoroethyl tosylate for the alkylation of phenols.

RSC Advances 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, Application of Bis(4-fluorophenyl)methane.

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