Month: November 2022

Akai, Shuji published the artcileSynthesis of Long-Chain [¹⁸F]Deoxyfluoropoly(ethylene glycol) Methyl Ethers and Their Noninvasive Pharmacokinetic Analysis by Positron Emission Tomography, COA of Formula: C17H37NO3, the publication is Molecular Pharmaceutics (2011), 8(1), 302-308, database is CAplus and MEDLINE.

[¹⁸F]DeoxyfluoroPEG Me ethers with an average mol. weight of 2 kDa and 10 kDa were synthesized by the fluorination of the tosylates with [¹⁸F]nBu₄NF at 80 ¡ãC for 20 min followed by flash filtration through a Sep-Pak Plus Alumina-N cartridge. After the i.v. administration to rats, their pharmacokinetics was analyzed by noninvasive, real-time, whole-living-body monitoring using positron imaging technol. The effect of PEG’s mol. weight on their blood circulation and organ clearance were quant. visualized for the first time.

Molecular Pharmaceutics published new progress about 17351-62-1. 17351-62-1 belongs to catalysis-chemistry, auxiliary class Salt,Amine, name is Tetrabutylammonium hydrogencarbonate, and the molecular formula is C17H37NO3, COA of Formula: C17H37NO3.

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

Szpera, Robert published the artcileSynthesis of Fluorinated Alkyl Aryl Ethers by Palladium-Catalyzed C-O Cross-Coupling, Computed Properties of 17351-62-1, the publication is Organic Letters (2020), 22(16), 6573-6577, database is CAplus and MEDLINE.

Herein, we report a highly effective protocol for the cross-coupling of (hetero)aryl bromides with fluorinated alcs. using the com. available precatalyst ^tBuBrettPhos Pd G3 and Cs₂CO₃ in toluene. This Pd-catalyzed coupling features a short reaction time, excellent functional group tolerance, and compatibility with electron-rich and -poor (hetero)arenes. The method provides access to ¹⁸F-labeled trifluoroethyl ethers by cross-coupling with [¹⁸F]trifluoroethanol. Safety: 2-fluoroethanol is highly toxic.

Organic Letters published new progress about 17351-62-1. 17351-62-1 belongs to catalysis-chemistry, auxiliary class Salt,Amine, name is Tetrabutylammonium hydrogencarbonate, and the molecular formula is C12H9NO, Computed Properties of 17351-62-1.

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

Palotash, L. published the artcileProduction and properties of several aryloxycarboxylic acids, Application of 2-(4-(tert-Butyl)phenoxy)acetic acid, the publication is Nauch.-Tekh. Konf., Moskov. Neftekhim. i Gaz. Prom. Inst., 11-ya[Odinnadtsataya]i 12-ya[Dvenadtsataya] (1958), 205-14, database is CAplus.

In the search for dicarboxylic acids (like terephthalic acid) to use in the production of synthetic fibers, o-C₆H₄(CO₂H)OCH₂CO₂H was prepared Salicylic acid (10 g.) was treated with 35 g. 33.3% NaOH. After addition of 25 g. ClCH₂CO₂H (50% solution), the mixture was heated 2 hrs. on a water bath, cooled, neutralized with dilute HCl (1:1), extracted with Et₂O, and the product precipitated with soda. Acidification of the Na salt yielded 60% white needles, m. 151¡ã (H₂O). Me₂C(C₆H₄OCH₂CO₂H-4)₂, m. 165¡ã, was also prepared

Nauch.-Tekh. Konf., Moskov. Neftekhim. i Gaz. Prom. Inst., 11-ya[Odinnadtsataya]i 12-ya[Dvenadtsataya] 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, Application of 2-(4-(tert-Butyl)phenoxy)acetic acid.

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

Ismail, Rehana published the artcileCationic imidazolium polymer monoliths for efficient solvent exchange, activation and fluorination on a continuous flow system, Application of Tetraethylammonium hydrogencarbonate, the publication is RSC Advances (2014), 4(48), 25348-25356, database is CAplus.

Polystyrene-imidazolium (PS-Im+Cl-) monolith was synthesized within a flow-through microfluidic chip and Teflon tubing for activating [¹⁸F]fluoride ions. The [¹⁸F]fluoride ions were trapped on the PS-Im+ monolith and were subsequently released with various phase-transfer catalysts (PTC) and carbonate or bicarbonate bases in microliter volumes of organic solvents containing 0.5% of water. The activated [¹⁸F]fluoride complex released from the PS-Im+ monolith was used to fluorinate various known PET probe precursors with diverse reactivity in a subsequent flow-through microfluidic chip without performing addnl. azeotropic distillation The fluorination yields under the optimized condition for the protected [¹⁸F]FDG, protected [¹⁸F]FLT, 4-[¹⁸F]fluoroethylbenzoate, and [¹⁸F]fallypride were 93%, 96%, 77% and 73%, resp. This method, utilizing the PS-Im+ monolith on a flow through microfluidic platform, enables the entire fluorine-18 radiochem. to be performed on a flow-through microfluidic device within a shorter synthesis time and with fluorination efficiency that is comparable to or higher than conventional means.

RSC Advances published new progress about 17351-61-0. 17351-61-0 belongs to catalysis-chemistry, auxiliary class Phase Transfer Catalyst, name is Tetraethylammonium hydrogencarbonate, and the molecular formula is C9H21NO3, Application of Tetraethylammonium hydrogencarbonate.

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

Ishibashi, Masataka published the artcileDiethylhydrogensilyl-cyclic diethylsilylene derivatives in the gas chromatography-mass spectrometry of hydroxylated steroids. IV. Hydrocortisone, Related Products of catalysis-chemistry, the publication is Journal of Chromatography (1987), 197-206, database is CAplus.

The 3,20-bismethyloxime-11-diethylhydrogensilyl-17,21-cyclic diethylsilylene derivative of hydrocortisone (HC) was obtained by treating HC with O-methylhydroxylamine-HCl and then with N,O-bis(diethylhydrogensilyl)trifluoroacetamide. This derivative gave a single peak without resolution of its structural isomers. The electron-impact mass spectrum of the HC derivative was characterized by the appearance of an intense mol. ion peak and principal ion peak of [M – OCH₃]⁺ at m/z 559. The detection limit was 10 pg with a signal-to-noise ratio of >10 when gas chromatog. (GC)-selected ion monitoring was carried out at the mol. ion of m/z 590. On the other hand, GC-metastable peak monitoring, based on the metastable peak corresponding to the transition ions from m/z 590 to 559, showed a detection limit of ?10 pg with a signal-to-noise ratio of >5.

Journal of Chromatography published new progress about 6084-58-8. 6084-58-8 belongs to catalysis-chemistry, auxiliary class Salt,Amine,Aliphatic hydrocarbon chain, name is O-Isobutylhydroxylamine hydrochloride, and the molecular formula is C4H12ClNO, Related Products of catalysis-chemistry.

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

Tamaki, Kunio published the artcileHeats of solutions of bolaform electrolytes in water, Product Details of C3H12Cl2N2, the publication is Bulletin of the Chemical Society of Japan (1983), 56(9), 2831-2, database is CAplus.

The heats of solutions of polymethylene-diammonium dichlorides, [H₃N(CH₂)_nNH₃]Cl₂ (n = 2-8, 10, and 12) and disodium polymethylene disulfates, Na₂[O₃SO(CH₂)_nOSO₃] (n = 2-6, 8, and 10), in water were measured at 15, 25, and 35¡ã. The changes in the heat capacity for dissolution, ¦¤C_p⁰, were obtained from the relation between the heats of solution and the temperature and the results were compared with the ¦¤C_p⁰ values for alkylammonium chlorides and Na alkyl sulfates previously reported.

Bulletin of the Chemical Society of Japan published new progress about 10517-44-9. 10517-44-9 belongs to catalysis-chemistry, auxiliary class Salt,Amine,Aliphatic hydrocarbon chain, name is Propane-1,3-diamine dihydrochloride, and the molecular formula is C3H12Cl2N2, Product Details of C3H12Cl2N2.

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

Olaizola, Olatz published the artcileBronsted Base Catalyzed One-Pot Synthesis of Stereodefined Six-Member Carbocycles Featuring Transient Trienolates and a Key Intramolecular 1,6-Addition, Name: 2,4,6-Triisopropylbenzenethiol, the publication is Angewandte Chemie, International Edition (2019), 58(40), 14250-14254, database is CAplus and MEDLINE.

A catalyst-driven one-pot reaction sequence is developed for the enantio- and diastereoselective synthesis of tetrasubstituted cyclohexenes from simple unsaturated ketones or thioesters. The method involves a tertiary amine/squaramide-catalyzed ¦Á-selective addition of transiently generated trienolates to nitroolefins, subsequent base-catalyzed double bond isomerization, and an intramol. (vinylogous) 1,6-addition reaction, a rare key carbocyclization step that proceeded with essentially perfect stereocontrol.

Angewandte Chemie, International Edition 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, Name: 2,4,6-Triisopropylbenzenethiol.

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

Tamoradi, Taiebeh published the artcileLa complex supported on magnetic nanoparticles: green, efficient, novel and reusable nanocatalyst for the synthesis of 5-substituted tetrazoles and the oxidation reactions in neat condition, Application of 2,2′-Dithiodibenzoic acid, the publication is Journal of the Iranian Chemical Society (2019), 16(8), 1723-1733, database is CAplus.

In the present work, we were interested in the synthesis of green and novel magnetic nanocatalyst by anchoring La complex on Fe₃O₄. The nanocatalyst was successfully synthesized and characterized by FT-IR, SEM, TGA, XRD, EDX, and ICP techniques. The designed procedure shows many benefits such as short reaction time, high yield, excellent purity, eco-friendly catalyst, easy workup and easy recovery from the reaction mixture by external magnet.

Journal of the Iranian Chemical Society published new progress about 119-80-2. 119-80-2 belongs to catalysis-chemistry, auxiliary class sulfides,Carboxylic acid,Benzene, name is 2,2′-Dithiodibenzoic acid, and the molecular formula is C15H12O6, Application of 2,2′-Dithiodibenzoic acid.

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

Ueda, Naomi published the artcileImprovement of conservation for waterlogged woods using polyethylene glycol (PEG) (treatment with cationic surfactants), Recommanded Product: Dodecylamineacetate, the publication is Zairyo (1992), 41(461), 148-52, database is CAplus.

In the conventional polyethylene glycol (I) method for conservation of waterlogged wood, it is sometimes difficult for I to penetrate into the wood, depending on wood species or the degree of deterioration, and shrinkage (e.g., maximum 20 ? 30% in tangential direction) or warp of specimens occurs. In order to maintain its dimensions and mech. strength, Akagashi (Quercus?acuta?Thunb.) wood was treated with some cationic surfactants which were easily adsorbed on cellulose and thus lowered surface tension of water. With the surfactant treatment it was expected that possible shrinkage accompanied by water evaporation could be decreased. The wood samples were soaked in a dilute cationic surfactant solution, followed by immersion in I solution with gradual increase of its concentration The variations of dimension and weight were monitored periodically. The surfactant treatment allowed I to penetrate easily into waterlogged wood. Furthermore, it was noticed that the shrinkage and change in shape could be minimized, and the dimensions were maintained without any significant change. In addition, by using the present treatment, one can expect that the penetration time in PEG treatment will be shortened.

Zairyo 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 C18H25BN2O3, Recommanded Product: Dodecylamineacetate.

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

Takazawa, Ken published the artcilePhase-transition-induced jumping, bending, and wriggling of single crystal nanofibers of coronene, HPLC of Formula: 191-07-1, the publication is Scientific Reports (2021), 11(1), 3175, database is CAplus and MEDLINE.

For decades, it has been reported that some organic crystals suddenly crack, break, or jump when they are heated from room temperature Recently, such crystals have been intensively studied both in fundamental science and for high-speed mech. device applications. According to these studies, the sudden crystal motions have been attributed to structural phase transitions induced by heating. Stress created by the phase transition is released through the sudden and rapid motion of the crystals. Here we report that single crystal nanofibers of coronene exhibit a new type of ultrafast motion when they are cooled from room temperature and subsequently heated to room temperature The nanofibers make centimeter-scale jumps accompanied by surprisingly unique behaviors such as sharp bending and wriggling. We found that the motions are caused by a significantly fast structural phase transition between two polymorphs of coronene. A theor. investigation revealed that the sudden force generated by the phase transition together with the nanoscale dimensions and elastic properties create dynamical instability in the nanofibers that results in the motions. Our finding demonstrates the novel mechanism that leads to ultrafast, large deformation of organic crystals.

Scientific Reports published new progress about 191-07-1. 191-07-1 belongs to catalysis-chemistry, auxiliary class Electronic Materials, name is Coronene, and the molecular formula is C18H10, HPLC of Formula: 191-07-1.

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