Month: December 2022

Gaiti, A. published the artcileEffects of butyric acid derivatives on membrane-bound and soluble hydroxymethylglutaryl coenzyme A reductase of rat liver, Product Details of C11H14O2, the publication is Archives Internationales de Physiologie et de Biochimie (1971), 79(3), 555-63, database is CAplus and MEDLINE.

The effect of ¦Â-benzylidenebutyric acid (3-methyl-4-phenyl-4-butenoic acid, I) on 3-hydroxy-3-methylglutaryl-CoA reductase (II) was studied in rat liver microsomes and a soluble preparation in order to identify the site of inhibition of cholesterol synthesis by I. 3-Hydroxy-3-methyl glutaric acid-3-14C was converted to the CoA derivative for assay of II; the product of II activity, mevalonic acid, was separated by Celite column chromatog. I inhibited the soluble form of II, as did 2-hydroxy-I, 2-methyl-4-phenylbutanoic acid and 3-phenylisopentanoic acid. The same compounds did not affect the membrane-bound enzyme, perhaps because of a nonspecific effect of drugs on the permeability of the membrane to substrate.

Archives Internationales de Physiologie et de Biochimie 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, Product Details of C11H14O2.

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

Ji, Kegong published the artcileGold-catalyzed regioselective oxidation of propargylic carboxylates: a reliable access to ¦Á-carboxy-¦Á,¦Â-unsaturated ketones/aldehydes, Application In Synthesis of 1237588-12-3, the publication is Beilstein Journal of Organic Chemistry (2013), 1925-1930, 6 pp., database is CAplus and MEDLINE.

Gold-catalyzed intermol. oxidation of carboxylates of primary or secondary propargylic alcs. are realized with excellent regioselectivity, which is ascribed to inductive polarization of the C-C triple bond by the electron-withdrawing carboxy group. The gold carbene intermediates thus generated undergo selective 1,2-acyloxy migration over a 1,2-C-H insertion, and the selectivities could be dramatically improved using a P,S-bidentate ligand, which is proposed to enable the formation of tris-coordinated and hence less electrophilic gold carbene species. ¦Á-Carboxy ¦Á,¦Â-unsaturated ketones/aldehydes can be obtained with fair to excellent yields.

Beilstein Journal of Organic Chemistry published new progress about 1237588-12-3. 1237588-12-3 belongs to catalysis-chemistry, auxiliary class Mono-phosphine Ligands, name is 4-(2-(Di(adamantan-1-yl)phosphino)phenyl)morpholine, and the molecular formula is C30H42NOP, Application In Synthesis of 1237588-12-3.

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

Francis, Daniel published the artcileSynthesis of ¦Â-Diamine Building Blocks by Photocatalytic Hydroamination of Enecarbamates with Amines, Ammonia and N-H Heterocycles, SDS of cas: 22693-41-0, the publication is Chemistry – A European Journal (2020), 26(65), 14861-14865, database is CAplus and MEDLINE.

3-Amino-substituted saturated nitrogen heterocycles were an important subclass of ¦Â-diamines, appearing in a number of clin. agents. A unified approach to these products based upon the regioselective photoredox-mediated hydroamination of enecarbamates was discussed. The amine coupling partner was encompass diversed amine types under a single set of reaction conditions, including primary alkyl amines, ammonia, aryl and heteroaryl amines, and N-H heterocycles. The method enabled the synthesis of a wide range of pharmaceutically relevant building blocks.

Chemistry – A European Journal 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, SDS of cas: 22693-41-0.

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

Vakarelska, Ekaterina published the artcilePersistent organic pollutants (POPs) – QSPR classification models by means of Machine learning strategies, Name: Coronene, the publication is Chemosphere (2022), 287(Part_2), 132189, database is CAplus and MEDLINE.

Persistent Organic pollutants (POPs) are toxic chems. with a shallow degradation rate and global neg. impact. Their physicochem. is combined with the complex effects of long-term POPs accumulation in the environment and transport function through the food chain. That is why POPs have been linked to adverse effects on human health and animals. They circulate globally via different environmental pathways, and could be detected in regions far from their source of origin. The primary goal of the present study is to carry out classification of various representatives of POPs using different theor. descriptors (mol., structural) to develop quant. structure-properties relationship (QSPR) models for predicting important properties POPs. Multivariate statistical methods such as hierarchical cluster anal., principal components anal. and self-organizing maps were applied to reach excellent partitioning of 149 representatives of POPs into 4 classes using ten most appropriate descriptors (out of 63) defined by variable reduction procedure. The predictive capabilities of the defined classes could be applied as a pattern recognition for new and unidentified POPs, based only on structural properties that similar mols. may have. The addnl. self-organizing maps technique made it possible to visualize the feature-space and investigate possible patterns and similarities between POPs mols. It contributes to confirmation of the proper classification into four classes. Based on SOM results, the effect of each variable and pattern formation has been presented.

Chemosphere 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 C2H4ClNO, Name: Coronene.

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

Bi, Yubai published the artcileA Visible Light Initiating System for Free Radical Promoted Cationic Polymerization, Application In Synthesis of 2909-77-5, the publication is Macromolecules (1994), 27(14), 3683-93, database is CAplus.

A visible light initiator system (containing a xanthene dye, an aromatic amine, and a diaryliodonium salt) for the photoinduced cationic polymerization of epoxides is reported. The polymerization in the radicals generated from the visible-light absorber starts a chain process which, after oxidation of the formed radicals, produces a cationic chain initiating carbocation. The system can efficiently photoinitiate the polymerization of certain cyclic ethers at any wavelength of the visible spectrum depending on the dye’s absorption spectrum and its oxidation/reduction potentials. Epoxides do not polymerize in the absence of any of the 3 components or in the absence of light. Aromatic amines of low basicity containing ¦Á-Hs are the preferred coinitiators for the polymerization of cyclohexene oxide (I). Studies on photochem. reactions between each 2 of the 3 components demonstrate that both oxidative bleaching of the dye by the diaryliodonium salt and reductive bleaching by the aromatic amine contribute to ¦Á-amino radical formation. The radical formed can be easily oxidized into an ¦Á-aminocarbocation by an onium salt of proper potential. Characterization of the polymer formed from I indicates that all the xanthene dye and appreciable amounts of the aromatic amine are incorporated in the polymer. It is believed that the ¦Á-aminocarbocation initiates the ring opening cationic polymerization Dye mols. are incorporated into the polymer in chain-terminating processes.

Macromolecules published new progress about 2909-77-5. 2909-77-5 belongs to catalysis-chemistry, auxiliary class Amine,Benzene, name is 2,6-Diisopropyl-N,N-dimethylaniline, and the molecular formula is C14H23N, Application In Synthesis of 2909-77-5.

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

Torres-Filho, A. published the artcileMechanical Properties of Acrylate Networks Formed by Visible Laser-Induced Polymerization. 2. Control of the Mechanical Properties, Category: catalysis-chemistry, the publication is Chemistry of Materials (1995), 7(4), 744-53, database is CAplus.

The mech. properties of some acrylate networks formed by visible laser-induced polymerization were studied as a function of the initial mol. composition of the reacting mixture The study included, besides some changes in the monomer composition, the influence of the acidity of the medium when ionizable dyes were used as photoinitiators. It was also shown that the mech. strength of the network polymers can be significantly improved by the addition of inorganic fillers which have been surface treated with silane coupling agents containing polymerizable groups or by adding to the multifunctional acrylate monomers a solution containing a stronger performed polymer. It was further observed that some of the phys. properties of the parts formed may be anisotropic depending on the direction of laser scanning for photopolymer formation. The work also describes different attempts to obtain an elastomeric material by copolymerizing a flexible acrylated oligomer with the networking monomers.

Chemistry of Materials published new progress about 2909-77-5. 2909-77-5 belongs to catalysis-chemistry, auxiliary class Amine,Benzene, name is 2,6-Diisopropyl-N,N-dimethylaniline, and the molecular formula is C6H8O6, Category: catalysis-chemistry.

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

Torres-Filho, a. published the artcileMechanical properties of acrylate networks formed by visible laser-induced polymerization. I. Dependence on photopolymerization parameters, Recommanded Product: 2,6-Diisopropyl-N,N-dimethylaniline, the publication is Journal of Applied Polymer Science (1994), 51(5), 931-7, database is CAplus.

The mech. properties of network mol. systems, prepared through visible (Ar⁺) laser-induced polymerization of multifunctional acrylates, were studied as a function of some of the photopolymerization parameters. Acrylate monomers used were 1,6-hexanediol diacrylate, trimethylolpropane triacrylate, dipentaerythritol pentaacrylate, and polyethylene glycol diacrylate. The properties investigated were the Young’s modulus of elasticity and the stress-at-break, both derived from the stress vs. strain test of dogbone-shaped photopolymerized samples. The parameters studied included the fluorone dye and co-initiator concentrations, and the laser power. The authors also compared the mech. properties of samples made using different types of fluorone dyes and using two different amines as co-initiator. Better polymers are formed by dyes with lower fluorescence quantum yield. The three photopolymerization parameters modify the mech. properties in a very similar way: they initially tend to increase both the Young’s modulus and the stress-at-break but have a deleterious effect on the material strength if used in excess. N-phenylglycine used as a co-initiator formed stronger polymers (higher Young’s modulus) than N,N-dimethyl-2,6-diisopropylaniline. The authors discussed possible mol. mechanisms for such observations.

Journal of Applied Polymer Science published new progress about 2909-77-5. 2909-77-5 belongs to catalysis-chemistry, auxiliary class Amine,Benzene, name is 2,6-Diisopropyl-N,N-dimethylaniline, and the molecular formula is C15H24O2, Recommanded Product: 2,6-Diisopropyl-N,N-dimethylaniline.

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

Shou, Hansen published the artcileFormation of multicolor polymeric objects by laser-initiated photopolymerization, Related Products of catalysis-chemistry, the publication is Journal of Imaging Science and Technology (1995), 39(1), 18-26, database is CAplus.

The formation of multicolor polymeric objects by laser-induced photopolymerization of photocurable compositions is reported. The formation of a colored plastic object results from: (1) a combination of photobleachable initiators that react at different rates as a function of differing wavelengths of irradiation; (2) an indicator and a photoacid-generating compound used in combination with a photocuring process or thereafter; or (3) a photochromic material used in combination with a photopolymerizable monomeric system. The influence of the factors affecting color formation and the photostability of the formed color polymeric film are evaluated.

Journal of Imaging Science and Technology published new progress about 2909-77-5. 2909-77-5 belongs to catalysis-chemistry, auxiliary class Amine,Benzene, name is 2,6-Diisopropyl-N,N-dimethylaniline, and the molecular formula is C10H16O2, Related Products of catalysis-chemistry.

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

Hassoon, Salah published the artcileElectron Transfer Photoreduction of 5,7-Diiodo-3-butoxy-6-fluorone with Tetrabutylammonium Triphenylbutylborate and N,N-Dimethyl-2,6-diisopropylaniline, Computed Properties of 2909-77-5, the publication is Journal of Physical Chemistry (1995), 99(23), 9416-24, database is CAplus.

The photoreduction of 5,7-diiodo-3-butoxy-6-fluorone (DIBF) in the presence of the electron donors, tetrabutylammonium triphenylbutylborate (BORATE), and N,N-dimethyl-2,6-diisopropylaniline (DIDMA) was studied in acetonitrile solution The transient phenomena examined using nanosecond laser flash photolysis confirm that the reduction is a one-electron transfer process from the electron donor to the excited triplet state of the dye. Triplet quenching rate constants were measured for BORATE and DIDMA as well as oxygen. The relative quenching rates for oxygen and DIDMA are ¡Ö20:1. The electron transfer rates calculated are 6.7 ¡Á 10⁷ and 1.2 ¡Á 10⁸ s^-1 in the BORATE and DIDMA systems, resp. The dye radical anion (DIBF^?, ¦Ë_max ¡Ö 420 nm) formed by the electron transfer reaction is the only product obtained in the BORATE case. However, with DIDMA the dye “neutral” radical (DIBF^?, ¦Ë_max ¡Ö 360 nm) was detected as the only product. DIBF^? formed after protonation of DIBF^?- by proton transfer from the amino cation radical. This implies that the proton transfer is too fast to measure on the nanosecond time scale. This is the first such observation in these systems. Singlet oxygen formed by oxygen quenching of the dye triplet was found to be quenched by the electron donors via an electron transfer process also. No quenching of DIBF triplet occurred in the presence of the electron acceptor (4-octyloxyphenyl)phenyliodonium hexafluoroantimonate (OPPI). The principal photobleached products detected by HPLC were reduced quinomethines in the DIDMA case and the ammonium salts of the reduced quinomethines in the BORATE case. Reoxygenation of these products regenerates the original dye in a reaction the rate of which depends on the polarity of the solution However, the reoxygenation of the quinomethines is faster than that of their ammonium salts under the same conditions.

Journal of Physical Chemistry published new progress about 2909-77-5. 2909-77-5 belongs to catalysis-chemistry, auxiliary class Amine,Benzene, name is 2,6-Diisopropyl-N,N-dimethylaniline, and the molecular formula is C14H23N, Computed Properties of 2909-77-5.

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

Harvey, Mack C. published the artcileSilicon-phenyl asymmetrical stretching vibration, Synthetic Route of 312-40-3, the publication is Applied Spectroscopy (1962), 12-14, database is CAplus.

The observed spectra of Ph₄X, where X = C, Si, Ge, Sn, or Pb, were studied. The Si-Ph vibration should occur near 515 cm.^-1 A strong band appears there for 22 compounds of the types Ph₄Si, Ph₃SiX, Ph₂SiX₂, Ph₂SiXY, and PhSiX₂Y.

Applied Spectroscopy 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, Synthetic Route of 312-40-3.

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