Catalysis-chemistry

Wong, Marie L. J. published the artcileDirect catalytic asymmetric synthesis of ¦Á-chiral bicyclo[1.1.1]pentanes, HPLC of Formula: 22693-41-0, the publication is Nature Communications (2021), 12(1), 1644, database is CAplus and MEDLINE.

An approach to synthesize ¦Á-chiral bicyclo[1.1.1]pentanes I (R = Me, Bn, thiophen-2-yl, etc.) (BCPs) involving the direct, asym. addition of simple aldehydes RCH₂CHO to [1.1.1]propellane, the predominant BCP precursor was described. This is achieved by combining a photocatalyst and an organocatalyst to generate a chiral ¦Á-iminyl radical cation intermediate, which installs a stereocenter simultaneously with ring-opening of [1.1.1]propellane. The reaction proceeds under mild conditions, displays broad scope, and provides an array of ¦Á-chiral BCPs I in high yield and enantioselectivity. They also present a theor. model for stereoinduction in this mode of photoredox organocatalysis.

Nature Communications 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 C8H7NO4, HPLC of Formula: 22693-41-0.

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

Poklukar, Gasper published the artcileModular 1,1′-Ferrocenediyl-cored P-Stereogenic Diphosphines: ”JDayPhos” Series and its Use in Rhodium(I)-Catalyzed Hydrogenation, HPLC of Formula: 15732-75-9, the publication is Advanced Synthesis & Catalysis (2018), 360(13), 2566-2570, database is CAplus.

A novel ferrocene-based P-stereogenic diphospine ligand series dubbed JDayPhos was developed, which rhodium(I) complexes of some of its members exhibited excellent enantioselectivity (up to >99% ee) and high activity in asym. hydrogenation of ¦Â-unsubstituted or -substituted itaconates and ¦Á-methylene-¦Ã-oxo-carboxylates.

Advanced Synthesis & Catalysis published new progress about 15732-75-9. 15732-75-9 belongs to catalysis-chemistry, auxiliary class Alkenyl,Carboxylic acid,Benzene,Ketone, name is 2-Methylene-4-oxo-4-phenylbutanoic acid, and the molecular formula is C11H10O3, HPLC of Formula: 15732-75-9.

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

Uhl, Werner published the artcileGa-Ga Bonds as Key Building Blocks for the Formation of Supramolecular Entities – Unusual Macrocyclic Tetra- and Octagallium Compounds, Application of 2,2-(1,2-Phenylenebis(oxy))diacetic acid, the publication is European Journal of Inorganic Chemistry (2017), 2017(15), 2270-2278, database is CAplus.

Treatment of the digallium compound R₂Ga-GaR₂ (1) [R = CH(SiMe₃)₂] with the dicarboxylic acids 1,2- and 1,4-(HO₂CCH₂O)₂C₆H₄ afforded, by the release of H₂C(SiMe₃)₂, macrocyclic compounds 2a and 2c, in which two organic spacer ligands connect two metal-metal bonds. Two CO₂ groups bridge each Ga-Ga bond, and different structures resulted with a parallel or perpendicular arrangement of the bridging ligands. The resorcinol derivative 1,3-(HO₂CCH₂O)₂C₆H₄ yielded the unique compound 2b, in which four Ga-Ga bonds are bridged by four spacer ligands. The organic groups form loops, which are alternately arranged above and below the mol. plane with four saddle points and a structure approaching 4 symmetry. The 1,2- and 1,4-diacids afforded tetrakis(digallium) compounds 3a and 3c in the presence of water. In both cases carboxylate groups and hydroxido ligands bridge two Ga atoms of two different Ga-Ga bonds. The spacer ligands connect two of these fragments and adopt parallel orientations to form mol. boxes. Again, the 1,3-diacid afforded a unique structural motif in which a Ga₄O₆ skeleton (two Ga-Ga bonds) is bridged by a single organic spacer, reminiscent of the handle of a basket.

European Journal of Inorganic Chemistry 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 C18H35NO, Application of 2,2-(1,2-Phenylenebis(oxy))diacetic acid.

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

Nawrocka, Wanda P. published the artcileSynthesis of New 4(3H)-Quinazolinone Derivatives by Reaction of 3-Amino-2(1H)-thioxo-4(3H)-quinazolinone with Selected Substituted Cinnamic Acids and Halogenoketones, Application In Synthesis of 16909-09-4, the publication is Phosphorus, Sulfur and Silicon and the Related Elements (2008), 183(6), 1379-1387, database is CAplus.

Two series of N-acylated and S-alkylated 4(3H)-quinazolinone derivatives, e.g., I (R = H, Me, MeO, F, Cl, Br, NO₂), have been synthesized by reaction of 3-amino-2(1H)-thioxo-4(3H)-quinazolinone with substituted cinnamic acids or halogenoketones (phenacyl bromides), resp.

Phosphorus, Sulfur and Silicon and the Related Elements published new progress about 16909-09-4. 16909-09-4 belongs to catalysis-chemistry, auxiliary class Alkenyl,Carboxylic acid,Benzene,Ether, name is (E)-3-(2,4-Dimethoxyphenyl)acrylic acid, and the molecular formula is C11H12O4, Application In Synthesis of 16909-09-4.

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

Lanigan, Rachel M. published the artcileDirect Synthesis of Amides from Carboxylic Acids and Amines Using B(OCH₂CF₃)₃, HPLC of Formula: 1772-76-5, the publication is Journal of Organic Chemistry (2013), 78(9), 4512-4523, database is CAplus and MEDLINE.

B(OCH₂CF₃)₃, prepared from readily available B₂O₃ and 2,2,2-trifluoroethanol, is as an effective reagent for the direct amidation of a variety of carboxylic acids with a broad range of amines. In most cases, the amide products can be purified by a simple filtration procedure using com. available resins, with no need for aqueous workup or chromatog. The amidation of N-protected amino acids with both primary and secondary amines proceeds effectively, with very low levels of racemization. B(OCH₂CF₃)₃ can also be used for the formylation of a range of amines in good to excellent yield, via transamidation of DMF.

Journal of Organic Chemistry published new progress about 1772-76-5. 1772-76-5 belongs to catalysis-chemistry, auxiliary class Benzenes, name is (E)-3-(3-Nitrophenyl)acrylic acid, and the molecular formula is C9H7NO4, HPLC of Formula: 1772-76-5.

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

Solomon, Michael published the artcileA coupled fluorometric rate assay for pyruvate dehydrogenase in cultured human fibroblasts, Category: catalysis-chemistry, the publication is Analytical Biochemistry (1984), 141(2), 337-43, database is CAplus and MEDLINE.

A method for measuring the activity of the pyruvate dehydrogenase complex (PDC) by coupling acetyl-CoA production to acetylation of a fluorescent dye is described. Acetylation of cresyl violet acetate by pigeon liver acetyltransferase results in a shift of its fluorescence spectrum from ¦Ë_ex?_max = 575, ¦Ë_em?_max = 620 nm to ¦Ë_ex?_max = 475, ¦Ë_em?_max = 575 nm (where ¦Ë = wavelength and ex and em = excitation and emission, resp.). The rate of appearance of acetylated dye was followed fluorometrically and was proportional to PDC activity in extracts of cultured human fibroblasts. The assay showed appropriate substrate and cofactor dependence and had a working range between 0.04 and 70 milliunits. It is 10-fold more sensitive than the spectrophotometric assay on which it is based (working range 0.4-31 milliunits) and is equally convenient. Unactivated PDC activity in fibroblast extracts was 0.75 (0.60-0.92) milliunits/mg protein (mean and range for 6 cell lines).

Analytical Biochemistry 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 C17H20ClN3, Category: catalysis-chemistry.

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

Wlodarczyk, Katarzyna published the artcileIntramolecular cationic cyclization of ¦Â-hydroxyalkylphosphine oxides-a route towards the benzophosphorinane core, Safety of Allyldiphenylphosphine oxide, the publication is Tetrahedron (2016), 72(33), 5074-5090, database is CAplus.

Intramol. cationic cyclization of ¦Â-hydroxyalkylphosphine oxides in the presence of an acid gives fused bicyclic compounds with an incorporated P atom. Depending on the structure of the starting compound the formation of either phosphaindane or benzophosphorinane oxides was observed The key difference in the reactivity arises from the substitution pattern at the carbinolic C atom of ¦Â-hydroxyalkylphosphine oxide.

Tetrahedron 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 C7H5Br2F, Safety of Allyldiphenylphosphine oxide.

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

Candish, Lisa published the artcileCatalytic Access to Alkyl Bromides, Chlorides and Iodides via Visible Light-Promoted Decarboxylative Halogenation, Formula: C11H14O2, the publication is Chemistry – A European Journal (2016), 22(29), 9971-9974, database is CAplus and MEDLINE.

The catalytic, visible light-promoted, decarboxylative halogenation (bromination, chlorination, and iodination) of aliphatic carboxylic acids such as 4-(4-bromophenoxy)butanoic acid, 1-tosylpiperidine-4-carboxylic acid, adamantan-1-carboxylic acid are reported. This operationally-simple reaction tolerates a range of functional groups, proceeds at room temperature, and is redox neutral. By employing an iridium photocatalyst in concert with a halogen atom source, the use of stoichiometric metals such as silver, mercury, thallium, and lead can be circumvented. This reaction grants access to valuable synthetic building blocks from the large pool of cheap, readily available carboxylic acids.

Chemistry – A European Journal 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, Formula: C11H14O2.

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

Palaniappan, An. published the artcileKinetics and mechanism of oxidation of some meta- and para- substituted phenoxyacetic acids by N-chloropiperazine-2,5-dione in non-aqueous medium, SDS of cas: 1798-04-5, the publication is Asian Journal of Chemistry (2002), 14(2), 607-613, database is CAplus.

The kinetics of oxidation of a number of meta- and para- substituted phenoxyacetic acids by N-chloropiperazine-2,5-dione (NCPD) were studied in methanol medium. The reaction shows unit order dependence with respect to oxidant and the order with respect to substrate varies depending on the nature of the substituent present in the ring. The rate is showing an inverse order of dependence with respect to [TsOH]. The rate increases with decrease in the percentage of methanol. Increase in ionic strength has no effect on the reaction rate. From the kinetic data obtained the activation parameters were computed and a suitable mechanism was proposed in accordance with multiparameter correlation anal.

Asian Journal of Chemistry 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

Kalaivanan, Raju published the artcileEffective Separation of N-benzyl-2-methyl-4-nitroaniline (BNA) Polymorphs through Antisolvent Crystallization Method, Application In Synthesis of 201157-13-3, the publication is Crystal Research and Technology (2018), 53(7), n/a, database is CAplus.

The Influence of antisolvent water on the polymorphic nucleation of N-benzyl-2-methyl-4-nitroaniline (BNA) during its crystallization from methanol solution is revealed. The solubility of BNA in methanol-water solvent mixtures is determined by gravimetric method and the variation in the level of supersaturation generated with respect to antisolvent concentration is assessed at different volume combinations of saturated methanol BNA solution and water. The supersaturation dependent polymorphic nucleation of orthorhombic and monoclinic forms and their growth morphologies such as platy-like orthorhombic and needle-like monoclinic are examined through in-situ optical microscopy. Single crystals of the grown polymorphs are successfully separated and their structural, thermal, spectroscopic and optical transmittance properties are confirmed through PXRD, DSC, FTIR and UV-Vis-near IR analyses resp.

Crystal Research and Technology 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, Application In Synthesis of 201157-13-3.

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