Catalysis-chemistry

Selvaraj, Pravinraj published the artcileA comparative study on electro-optic effects of organic n-benzyl-2-methyl-4-nitroaniline and morpholinium 2-chloro-4-nitrobenzoate doped in nematic liquid crystals e7, Safety of N-Benzyl-2-methyl-4-nitroaniline, the publication is Polymers (Basel, Switzerland) (2020), 12(12), 2977, database is CAplus and MEDLINE.

Improvements in electro-optical responses of LC devices by doping organic N-benzyl-2- methyl-4-nitroaniline (BNA) and Morpholinium 2-chloro-4-nitrobenzoate (M2C4N) in nematic liquid crystals (LCs) have been reported in this study. BNA and M2C4N-doped LC cells have the fall time that is fivefold and threefold faster than the pristine LC cell, resp. The superior performance in fall time of BNA-doped LC cell is attributed to the significant decrements in the rotational viscosity and threshold voltage by 44% and 25%, resp., and a strong addnl. restoring force resulted from the spontaneous polarization elec. field of BNA. On the other hand, the dielec. anisotropy (¦¤¦Å) of LC mixture is increased by 16% and 6%, resp., with M2C4N and BNA dopants. M2C4N dopant induces a large dielec. anisotropy, because the phenylamine/hydroxyl in M2C4N induces a strong intermol. interaction with LCs. Furthermore, BNA dopant causes a strong absorbance near the wavelength of 400 nm that filters the blue light. The results indicate that M2C4N doping can be used to develop a high ¦¤¦Å of LC mixture, and BNA doping is appropriate to fabricate a fast response and blue-light filtering LC device. D. Functional Theory calculation also confirms that BNA and M2C4N increase the dipole moment, polarization anisotropy, and hence ¦¤¦Å of LC mixture

Polymers (Basel, Switzerland) 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 C23H28N2O4, Safety of N-Benzyl-2-methyl-4-nitroaniline.

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

Selvaraj, Pravinraj published the artcileElectro-optical effects of organic N-benzyl-2-methyl-4-nitroaniline dispersion in nematic liquid crystals, Computed Properties of 201157-13-3, the publication is Scientific Reports (2020), 10(1), 14273, database is CAplus and MEDLINE.

The dispersion of organic N-benzyl-2-methyl-4-nitroaniline (BNA) in nematic liquid crystals (LCs) is studied. BNA doping decreases the threshold voltage of cell because of the reduced splay elastic constant and increased dielec. anisotropy of the LC mixture When operated in the high voltage difference condition, the BNA-doped LC cell has a fall time that is five times faster than that of the pure one because of the decrements in the threshold voltage of the cell and rotational viscosity of the LC mixture The addnl. restoring force induced by the BNA’s spontaneous polarization elec. field (SPEF) also assists to decrease the fall time of the LC cell. The decreased viscosity can be deduced from the decrements in phase transition temperature and associated order parameter of the LC mixture D. functional theory calculation demonstrates that the BNA dopant strengthens the absorbance for blue light, enhances the mol. interaction energy and dipole moment, decreases the mol. energy gap, and thus increases the permittivity of the LC mixture The calculation also shows that the increased dipole moment, polarizability, and polarizability anisotropy increase the dielec. anisotropy of the LC mixture, which agrees with the exptl. results well. BNA doping has a promising application to the fields of LC devices and displays.

Scientific Reports 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 C9H5FO2, Computed Properties of 201157-13-3.

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

Millwalla, Razia H. H. published the artcileProperties of N-fatty amine salts and their aqueous solutions, Safety of Dodecylamineacetate, the publication is Journal of the Indian Chemical Society (1988), 65(4), 263-5, database is CAplus.

H(CH₂)_nNH₂ (I; n = 11-18) were prepared and converted to H(CH₂)_nNH₃⁺ AcO^– (II; same n) and H(CH₂)_nNH₃⁺ EtCO₂^– (III; same n). The m.ps. of I–III (n = even) and I–III (n = odd) alternate, as do those of fatty acids; in a plot of m.p. vs. number of C atoms, the points for I–III (n = even) lie on a higher curve than those for I–III (n = odd). The Krafft points and critical micelle concentrations of II and III were determined The nature of the alkyl chain (even or odd number of C atoms) also appears to affect micellization behavior.

Journal of the Indian Chemical Society 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, Safety of Dodecylamineacetate.

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

Huang, Qiang published the artcileIron-Catalyzed Vinylzincation of Terminal Alkynes, Recommanded Product: 4,4′-Dimethyldiphenyl, the publication is Journal of the American Chemical Society (2022), 144(1), 515-526, database is CAplus and MEDLINE.

Organozinc reagents are among the most commonly used organometallic reagents in modern synthetic chem., and multifunctionalized organozinc reagents can be synthesized from structurally simple, readily available ones by alkyne carbozincation. However, this method suffers from poor tolerance for terminal alkynes, and transformation of the newly introduced organic groups is difficult, which limits its applications. Herein, the authors report a method for vinylzincation of terminal alkynes catalyzed by newly developed Fe catalysts bearing 1,10-phenanthroline-imine ligands. This method provides efficient access to novel organozinc reagents with a diverse array of structures and functional groups from readily available vinylzinc reagents and terminal alkynes. The method features excellent functional group tolerance (tolerated functional groups include amino, amide, cyano, ester, hydroxyl, sulfonyl, acetal, phosphono, pyridyl), a good substrate scope (suitable terminal alkynes include aryl, alkenyl, and alkyl acetylenes bearing various functional groups), and high chemoselectivity, regioselectivity, and stereoselectivity. The method could significantly improve the synthetic efficiency of various important bioactive mols., including vitamin A. Mechanistic studies indicate that the new Fe-1,10-phenanthroline-imine catalysts developed in this study has an extremely crowded reaction pocket, which promotes efficient transfer of the vinyl group to the alkynes, disfavors substitution reactions between the Zn reagent and the terminal C-H bond of the alkynes, and prevents the further reactions of the products. The authors’ findings show that Fe catalysts can be superior to other metal catalysts in terms of activity, chemoselectivity, regioselectivity, and stereoselectivity when suitable ligands were used.

Journal of the American Chemical Society published new progress about 613-33-2. 613-33-2 belongs to catalysis-chemistry, auxiliary class Benzene, name is 4,4′-Dimethyldiphenyl, and the molecular formula is C14H14, Recommanded Product: 4,4′-Dimethyldiphenyl.

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

Mangion, Ian published the artcileDynamic kinetic asymmetric allylation of hydrazines and hydroxylamines, Synthetic Route of 6084-58-8, the publication is Organic Letters (2009), 11(15), 3258-3260, database is CAplus and MEDLINE.

Hydrazines and hydroxylamines have been found to be excellent nucleophiles for the palladium-catalyzed dynamic asym. allylic amination of vinyl epoxide, with good yields and enantioselectivities of up to 97% ee. This method is applicable to acyclic and heterocyclic amines and was applied toward a five-step synthesis of (R)-piperazic acid.

Organic Letters 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, Synthetic Route of 6084-58-8.

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

Randall, William C. published the artcileQuantitative structure-activity relationships involving the inhibition of glycolic acid oxidase by derivatives of glycolic and glyoxylic acids, Related Products of catalysis-chemistry, the publication is Journal of Medicinal Chemistry (1979), 22(6), 608-13, database is CAplus and MEDLINE.

Seventy substituted glycolic, oxyacetic, and glyoxylic acids [RCH(OH)CO₂H, RCOCO₂H, and ROCH₂CO₂H where R = alkyl, substituted alkyl, Ph, aryl, or substituted aryl] including 6 new glycolic and glyoxylic acids were investigated as inhibitors of glycolate oxidase [9028-71-1], an enzyme involved in the metabolic production of oxalate. Such inhibitors are important in the treatment of genetic hyperoxalurias, diseases in which the overproduction of oxalate leads to systemic deposits of CaC₂O₄. Regression anal. and quant. structure-activity relations were used. The best overall correlation with inhibition was with the Hansch parameter ¦Ð.

Journal of Medicinal 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, Related Products of catalysis-chemistry.

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

Feigel, M. published the artcileA semiempirical AM1, MNDO and PM3 study of the rotational barriers of various ureas, thioureas, amides and thioamides, HPLC of Formula: 6972-05-0, the publication is Journal of Molecular Structure: THEOCHEM (1993), 33-48, database is CAplus.

AM1 was more than MNDO, or PM3 for calculating rotational barriers of compounds containing a RRN-CX-R linkage (amides, thioamides, ureas and thioureas). The barriers calculated with AM1 must be corrected using the equation ¦¤G_liquid^? = 1.6¦¤H_(AM1)^? + 4.5 kcal mol^-1 to obtain the best coincidence with exptl. values. Another equation, ¦¤H_ab?_initio^? = 1.35¦¤H_(AM1)^? + 2.05 kcal mol^-1 reproduces recent ab initio data well.

Journal of Molecular Structure: THEOCHEM published new progress about 6972-05-0. 6972-05-0 belongs to catalysis-chemistry, auxiliary class Thiourea,Amine,Aliphatic hydrocarbon chain,Amide, name is 1,1-Dimethylthiourea, and the molecular formula is C3H8N2S, HPLC of Formula: 6972-05-0.

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

Duhme, Anne Kathrin published the artcileLigand-deficient complexes of cadmium. Synthesis and spectroscopic characterization of molecular pentafluorophenyl cadmium thiolates and the structure of the cubane complex [{Cd(C₆F₅)(SBu^t)}₄], HPLC of Formula: 22693-41-0, the publication is Zeitschrift fuer Naturforschung, B: Chemical Sciences (1994), 49(1), 119-27, database is CAplus.

In toluene, bis(pentafluorophenyl)cadmium(II) and thiols RSH (R = Bu^t, 2,4,6-Prⁱ₃C₆H₂, 2,4,6-Bu^t₃C₆H₂) react to give soluble pentafluorophenyl cadmium thiolates [{Cd(C₆F₅)(SR)}_n]. The compounds [{Cd(C₆F₅)(SBu^t)}₄] (1).0.5 C₆H₅CH₃, [{Cd(C₆F₅)(SC₆H₂Prⁱ₃-2,4,6)}_n] (2).ca. 0.25 n C₆H₅CH₃, and [{Cd(C₆F₅)(SC₆H₂Bu^t₃-2,4,6)}_n] (3).ca. 0.25 n C₆H₅CH₃ were prepared in 65, 59 and 78% yields, resp. The structure of 1.0.5 C₆H₅CH₃ was determined by x-ray crystallog. 1 Is a cubane-type complex with a {Cd₄(¦Ì₃-SBu^t)₄}⁴⁺ core. Each Cd atom is coordinated by three bridging thiolato ligands and one terminal C₆F₅ group (Cd-S 2.62 ?, Cd-C 2.15 ? (mean values)). The central C atoms of the Bu^tS^– ligands of 1 show a remarkable low-field shift of their ¹³C NMR resonance (12.3 ppm relative to the value of the free thiol). A characteristic spectral feature of {Cd(C₆F₅)}⁺ complexes is the large value of the coupling constant ²J(¹⁹F,¹³C) of the ipso-C atom (1, 2: 68 Hz; 3: 67 Hz). The complexes [Cd(C₆F₅)(SR) + H]⁺, [Cd(SR)₂+H]⁺, and [Cd₂(SR)₃]⁺ were identified in the CI mass spectra (iso-butane) of 2 and 3.

Zeitschrift fuer Naturforschung, B: Chemical Sciences 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, HPLC of Formula: 22693-41-0.

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

Klingberg, Jenny published the artcilePolycyclic aromatic hydrocarbon (PAH) accumulation in Quercus palustris and Pinus nigra in the urban landscape of Gothenburg, Sweden, Application In Synthesis of 191-07-1, the publication is Science of the Total Environment (2022), 150163, database is CAplus and MEDLINE.

Trees have the potential to improve urban air quality as leaves and needles capture air pollutants from the air, but further empirical data was requested to quantify these effects. We measured the concentration of 32 polycyclic aromatic hydrocarbons (PAHs) in leaves of pin oak (Quercus palustris) and needles of black pine (Pinus nigra) in the City of Gothenburg, Sweden, during the summer of 2018. Oak leaves were collected twice (June, Sept.), while one-year-old (C + 1) and three-year-old (C + 3) pine needles were sampled in June to study the temporal development of leaf/needle PAH concentrations Specific leaf area (SLA) was estimated, which permitted calculation of leaf/needle area-based PAH content that were compared with the mass-based concentration In addition, the air concentration of PAHs and NO₂ was measured using passive samplers. There was a strong correlation between air concentrations of PAH and NO₂, indicating that the pollutants to a large degree originate from the same sources. In the oak leaves there was a significant decrease in low mol. mass PAHs (L-PAH, mainly gaseous) between June and Sept., but a significant increase in high mol. mass PAHs (H-PAH, mainly particle-bound). There was a strong correlation between L-PAH concentration in leaves and in air indicating an influence of equilibrium processes between ambient air and leaf. In the pine needles, there was a significant increase of both L-PAH and H-PAH in three-year-old needles compared to one-year-old needles. Pine was superior to oak in accumulating PAHs from the air, especially for L-PAHs when comparing area-based content. However, H-PAH concentrations were higher in oak leaves compared to pine needles on a leaf mass basis, emphasizing the importance of how concentrations are expressed. The results from this study can contribute to the development of urban planning strategies regarding the effect of vegetation on air quality.

Science of the Total Environment 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 C24H12, Application In Synthesis of 191-07-1.

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

Tardiff, Bennett J. published the artcileBuchwald-Hartwig amination of (hetero)aryl chlorides by employing Mor-DalPhos under aqueous and solvent-free conditions, Recommanded Product: 4-(2-(Di(adamantan-1-yl)phosphino)phenyl)morpholine, the publication is European Journal of Organic Chemistry (2012), 2012(21), 3972-3977, S3972/1-S3972/127, database is CAplus.

Aryl amines e. g., I are prepared via Buchwald-Hartwig amination of (hetero)aryl chlorides with primary or secondary amines conducted either under aqueous conditions without the use of co-solvents and/or surfactants or under solvent-free conditions using [Pd(cinnamyl)Cl]₂/Mor-DalPhos catalyst system. We have established that reactions of this type can be conducted without the rigorous exclusion of air, and in the case of the solvent-free reactions, we have demonstrated that appropriately selected liquid and solid reagents can be employed successfully.

European 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 C13H13N5O, Recommanded Product: 4-(2-(Di(adamantan-1-yl)phosphino)phenyl)morpholine.

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