Tag: M.W=200-250

Hu, Yuehua published the artcileRole of macromolecules in kaolinite flotation, HPLC of Formula: 2016-56-0, the publication is Minerals Engineering (2004), 17(9-10), 1017-1022, database is CAplus.

Flotation tests show that the floatability of kaolinite is much better in an acidic than in an alk. medium containing cationic collectors. The (001) basal planes of kaolinite are found to adsorb cationic collectors favorably, which render the surface hydrophobic. The (001) planes interact with macromols. carrying groups containing -O-, -N-, and/or -F- of high electronegativity, and the resultant flocculation minimizes the exposure of hydrophilic (001) planes. As a result, the cationic flotation of kaolinite is enhanced by the addition of these types of macromols. The zeta potential measurement and macromol. adsorption study indicate that the adsorption of anionic PAM on kaolinite is dominated mainly by hydrogen bonding interactions.

Minerals Engineering 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, HPLC of Formula: 2016-56-0.

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

Wang, Xicun published the artcilePhase transfer catalyzed synthesis of N,N-diaryl-1,2-phenylene dioxydiacetamides, Safety of 2,2-(1,2-Phenylenebis(oxy))diacetic acid, the publication is Synthetic Communications (1996), 26(14), 2765-2773, database is CAplus.

The reaction of 2,2′-[1,2-phenylenebis(oxy)]bis[acetic chloride] with arylamines gave 2,2′-[1,2-phenylenebis(oxy)]bis[N-arylacetamides] I (R = Ph, thiazolyl, naphthalenyl, etc.). The reactions were carried out under liquid-liquid phase transfer conditions, using polyethylene glycol-400 as a catalyst.

Synthetic Communications published new progress about 5411-14-3. 5411-14-3 belongs to catalysis-chemistry, auxiliary class Carboxylic acid,Benzene,Ether, name is 2,2-(1,2-Phenylenebis(oxy))diacetic acid, and the molecular formula is C18H10F3NO3S2, Safety of 2,2-(1,2-Phenylenebis(oxy))diacetic acid.

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

Cui, Wen-hui published the artcileSynthesis of 1,1′-[1,4-phenylenebis(methylene)]bis[1H-benzimidazole] isomers under microwave irradiation conditions, SDS of cas: 5411-14-3, the publication is Huaxue Shiji (2007), 29(8), 487-489, database is CAplus.

The title compounds were synthesized under microwave-irradiation conditions using benzenediamine and 2,2′-[phenylenebis(oxy)]bis[acetic acid] isomers as starting materials in the presence of polyphosphoric acid (PPA) and 4 mol/L hydrochloric acid as catalyst. The power of microwave irradiation applied was 650-850 W. The reaction time was 10-15 min. Product structures were confirmed by IR, ¹HNMR, ¹³CNMR, MS and elementary anal.

Huaxue Shiji published new progress about 5411-14-3. 5411-14-3 belongs to catalysis-chemistry, auxiliary class Carboxylic acid,Benzene,Ether, name is 2,2-(1,2-Phenylenebis(oxy))diacetic acid, and the molecular formula is C10H10O6, SDS of cas: 5411-14-3.

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

Wang, Xu-Dong published the artcileSynthesis, molecular docking and biological evaluation of 3-arylfuran-2(5H)-ones as anti-gastric ulcer agent, Name: 2-(3-(Benzyloxy)phenyl)acetic acid, the publication is Bioorganic & Medicinal Chemistry (2015), 23(15), 4860-4865, database is CAplus and MEDLINE.

3-Arylfuran-2(5H)-one derivatives show good antibacterial activity and were determined as tyrosyl-tRNA synthetase (TyrRS) inhibitors. In a systematic medicinal chem. exploration, we demonstrated chem. opportunities to treat infections caused by Helicobacter pylori. Twenty 3-arylfuran-2(5H)-ones were synthesized and evaluated for anti-H. pylori, antioxidant and anti-urease activities which are closely interconnected with H. pylori infection. The results displayed that some of the compounds show excellent antioxidant activity, and good anti-H. pylori and urease inhibitory activities. Out of these compounds, 3-(3-methylphenyl)furan-2(5H)-one (I) showed the most potent antioxidant activity (IC₅₀ = 8.2 ¦ÌM) and good anti-H. pylori activity (MIC₅₀ = 2.6 ¦Ìg/mL), and it can be used as a good candidate for discovering novel anti-gastric ulcer agent.

Bioorganic & Medicinal Chemistry published new progress about 1860-58-8. 1860-58-8 belongs to catalysis-chemistry, auxiliary class Carboxylic acid,Benzene,Ether, name is 2-(3-(Benzyloxy)phenyl)acetic acid, and the molecular formula is C8H11BO2, Name: 2-(3-(Benzyloxy)phenyl)acetic acid.

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

Takacs, James M. published the artcileCatalytic Iron-Mediated Enediene Carbocyclizations: Investigations into the Stereoselective Formation of Bicyclic Ring Systems, Name: Allyldiphenylphosphine oxide, the publication is Journal of Organic Chemistry (1995), 60(11), 3473-86, database is CAplus.

Trienes in which the requisite 1,3-diene and allylic ether moieties are appended to a pre-existing ring system afford bicyclic ring systems upon iron-catalyzed cyclization. The efficiency and stereoselectivity of the cyclization are dramatically influenced by the nature of the ring system to which the diene and alkene subunits are appended. Certain bicyclic ring systems are formed in good yield; most notably, substrates bearing a basic nitrogen are well-tolerated and certain indolizidine and quinolizidine ring systems are accessible using this methodol. The efficiency and stereoselectivity of the cyclization is also markedly dependent on the ligand used to modify the iron catalyst, and in this regard, a bisoxazoline-modified iron catalyst system is generally superior to what was the standard bipyridine-modified catalyst. In the course of these studies a difference spin polarization transfer (DSPT) experiment proved very useful for the stereochem. anal. of compounds that exhibit very crowded high field NMR spectra.

Journal of Organic Chemistry published new progress about 4141-48-4. 4141-48-4 belongs to catalysis-chemistry, auxiliary class Aryl phosphine ligand,Mono-phosphine Ligands, name is Allyldiphenylphosphine oxide, and the molecular formula is C10H10O4, Name: Allyldiphenylphosphine oxide.

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

Hyvonen, Mervi T. published the artcileMetabolism of triethylenetetramine and 1,12-diamino-3,6,9-triazadodecane by the spermidine/spermine-N¹-acetyltransferase and thialysine acetyltransferase, Recommanded Product: N1,N1′-(Ethane-1,2-diyl)bis(ethane-1,2-diamine) dihydrochloride, the publication is Drug Metabolism & Disposition (2013), 41(1), 30-32, database is CAplus and MEDLINE.

Triethylenetetramine (TETA; Syprine; Merck Rahway, NJ), a drug for Wilson’s disease, is a copper chelator and a charge-deficient analog of polyamine spermidine. We recently showed that TETA is metabolized in vitro by polyamine catabolic enzyme spermidine/spermine-N¹-acetyltransferase (SSAT1) and by thialysine acetyltransferase (SSAT2) to its monoacetylated derivative (MAT). The acetylation of TETA is increased in SSAT1-overexpressing mice compared with wild-type mice. However, SSAT1-deficient mice metabolize TETA at the same rate as the wild-type mice, indicating the existence of another N-acetylase respons 2ible for its metabolism in mice. Here, we show that siRNA-mediated knockdown of SSAT2 in HEPG2 cells and in primary hepatocytes from the SSAT1-deficient or wild-type mice reduced the metabolism of TETA to MAT. By contrast, 1,12-diamino-3,6,9-triazadodecane(SpmTrien), a charge-deficient spermine analog, was an extremely poor substrate of human recombinant SSAT2 and was metabolized by SSAT1 in HEPG2 cells and in wild-type primary hepatocytes. Thus, despite the similar structures of TETA and SpmTrien, SSAT2 is the main acetylator of TETA, whereas SpmTrien is primarily acetylated by SSAT1.

Drug Metabolism & Disposition 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, Recommanded Product: N1,N1′-(Ethane-1,2-diyl)bis(ethane-1,2-diamine) dihydrochloride.

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

Yang, Bo published the artcileNi-Catalyzed C-P Coupling of Aryl, Benzyl, or Allyl Ammonium Salts with P(O)H Compounds, Product Details of C15H15OP, the publication is Journal of Organic Chemistry (2019), 84(3), 1500-1509, database is CAplus and MEDLINE.

A methodol. that allows for the construction of C-P bonds via the nickel-catalyzed cross-coupling of organoammonium salts with appropriate phosphorus nucleophiles has been developed. Aryl-, pyridyl-, benzyl-, and allyl-ammonium triflates can be employed as the electrophiles. The employed phosphorus-based nucleophiles included diaryl/dibutyl phosphine oxide, dialkyl phosphonates, and Et phenylphosphinate. Functional groups OMe, CN, CF₃, F, Cl, C(O)NMe₂, and C(O)^tBu were tolerated.

Journal of Organic Chemistry published new progress about 4141-48-4. 4141-48-4 belongs to catalysis-chemistry, auxiliary class Aryl phosphine ligand,Mono-phosphine Ligands, name is Allyldiphenylphosphine oxide, and the molecular formula is C12H17NS2, Product Details of C15H15OP.

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

Satchell, D. P. N. published the artcileQuantitative aspects of Lewis acidity. I. A spectroscopic study of the equilibrium in solution between stannic halides and aromatic amines, Safety of 2-(4-(tert-Butyl)phenoxy)acetic acid, the publication is Journal of the Chemical Society (1964), 4134-42, database is CAplus.

Stannic chloride, bromide, and iodide, and substituted anilines (B) interact reversibly, in dilute solution in o-dichlorobenzene, to form 1B:1SnHal₄ adducts. From concentrated solutions, solids are precipitated These are normally brightly colored, and for the primary anilines studied have a 2B:1SnHal₄ stoichiometry. For secondary and tertiary anilines the stoichiometry found was 1:1. Steric factors probably prevent octahedral structures involving 2 bulkily substituted N atoms. Equilibrium constants were measured for the interactions in solution and, in all, 23 bases were studied, mostly with stannic chloride. The general order of increasing basicity toward a given stannic halide is very similar to that exhibited toward Broensted acids, though relative basicities are by no means exactly the same. The order of acid strength is SnCl₄ > SnBr₄ > SnI₄ and toward a given base the resp. equilibrium constants are roughly in the ratios 20,000:20:1. From a spectroscopic and structural viewpoint, the adducts fall into 2 types: “anilinium” type species involving spectral behavior similar to that attendant on anilinium-ion formation, and charge-transfer species which exhibit new, long-wavelength absorption. The former adducts result from strong acid-strong base pairs, while progressive weakening of either partner favors charge-transfer interaction. Solvent effects on the charge-transfer absorption and the related equilibrium constants were studied. A number of new pK_a values for aqueous solution are also reported.

Journal of the Chemical Society 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

Armstrong, Susan K. published the artcileStereocontrolled synthesis of homoallylic amines using phosphine oxides and isoxazolines, Category: catalysis-chemistry, the publication is Tetrahedron Letters (1991), 32(33), 4171-4, database is CAplus.

Allylic diphenylphosphine oxides, e.g., Ph₂P(O)CHMeCH:CH₂, undergo stereoselective 1,3-dipolar cycloadditions with nitrile oxides, e.g., PhCNO to give ¦¤²-isoxazolines, e.g., I. These may be reduced, also stereoselectively, to ¦Ä-amino-¦Â-hydroxyalkyldiphenylphosphine oxides, e.g., II. Stereospecific Wittig-Horner type elimination of Ph₂PO₂^– from the amino alcs., e.g., II, gives homoallylic amines, e.g., III, with controlled double bond geometry.

Tetrahedron Letters published new progress about 4141-48-4. 4141-48-4 belongs to catalysis-chemistry, auxiliary class Aryl phosphine ligand,Mono-phosphine Ligands, name is Allyldiphenylphosphine oxide, and the molecular formula is C15H15OP, Category: catalysis-chemistry.

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

Grayson, J. Ian published the artcile[(Phenylthio)allyl]- and [(phenylthio)vinyl]phosphine oxides. Synthesis of 1-(phenylthio)butadienes and a three-component synthesis of ketones, Synthetic Route of 4141-48-4, the publication is Journal of the Chemical Society, Perkin Transactions 1: Organic and Bio-Organic Chemistry (1972-1999) (1987), 967-76, database is CAplus.

The functionalization of some substituted allyl- and vinyldiphenylphosphine oxides is explored and routes to substituted ¦Ã-phenylthioallyl- and ¦Ã-phenylthiovinylphosphine oxides are described. These reagents are used in the synthesis of the title compounds Thus, reaction of Ph₂P(O)CHMeSPh (I) with Ac₂O for 8 days under acidic conditions gives 65% Ph₂P(O)C(SPh):CH₂ (II). I also forms 66% II by direct chlorination with N-chlorosuccinimide in CCl₄ and subsequent HCl elimination on silica. Treatment of II with RLi (R = Me, Bu, Me₂CHCH₂) followed with NH₄Cl-H₂O affords Ph₂P(O)CH(CH₂R)SPh. Addition of MeLi to II followed with PhCHO gives PhSC(CH₂Me):CHPh, which is hydrolyzed to give MeCH₂COCH₂Ph. The deprotonation and subsequent alkylation or thiolation reactions are presented for a variety of alkenyldiphenylphosphine oxides.

Journal of the Chemical Society, Perkin Transactions 1: Organic and Bio-Organic Chemistry (1972-1999) published new progress about 4141-48-4. 4141-48-4 belongs to catalysis-chemistry, auxiliary class Aryl phosphine ligand,Mono-phosphine Ligands, name is Allyldiphenylphosphine oxide, and the molecular formula is C15H15OP, Synthetic Route of 4141-48-4.

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