Catalysis-chemistry

Tangen, Isaac C. published the artcileComprehensive characterization of terahertz generation with the organic crystal BNA, Quality Control of 201157-13-3, the publication is Journal of the Optical Society of America B: Optical Physics (2021), 38(9), 420597, database is CAplus.

We characterize the terahertz (THz) generation of N-benzyl-2-methyl-4-nitroaniline (BNA), with crystals ranging in thickness from 123 to 700¦Ìm. We compare excitation using 800 nm and 1250 to 1500 nm wavelengths. Pumping BNA with 800 nm wavelengths and longer near-IR wavelengths results in a broad spectrum, producing out to 6 THz using a 100 fs pump, provided the BNA crystal is thin enough. ~200¦Ìm or thinner crystals are required to produce a broad spectrum with an 800 nm pump, whereas ~300¦Ìm thick crystals are optimal for broadband THz generation using the longer wavelengths. We report the favorable THz generation and optical characteristics of our BNA crystals that make them attractive for broadband, high-field THz generation, and we also compare differences in THz properties relative to BNA characteristics reported in other works.

Journal of the Optical Society of America B: Optical Physics 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 C25H34N4O2S, Quality Control of 201157-13-3.

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

Naksomboon, Kananat published the artcileS,O-Ligand-Promoted Palladium-Catalyzed C-H Functionalization Reactions of Nondirected Arenes, Product Details of C9H12O3S, the publication is ACS Catalysis (2017), 7(9), 6342-6346, database is CAplus and MEDLINE.

Pd(II)-catalyzed C-H functionalization of nondirected arenes has been realized using an inexpensive and easily accessible type of bidentate S,O-ligand. The catalytic system shows high efficiency in the C-H olefination reaction of electron-rich and electron-poor arenes. This methodol. is operationally simple, scalable, and can be used in late-stage functionalization of complex mols. The broad applicability of this catalyst has been showcased in other transformations such as Pd(II)-catalyzed C-H acetoxylation and allylation reactions.

ACS Catalysis published new progress about 77189-99-2. 77189-99-2 belongs to catalysis-chemistry, auxiliary class Thiophenol,Benzene,Ether, name is 2,4,6-Trimethoxybenzenethiol, and the molecular formula is C9H12O3S, Product Details of C9H12O3S.

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

Titova, I. A. published the artcileVicarious nucleophilic C-amination of nitrobenzene and 5- and 6-nitro-1-methylbenzimidazoles, Recommanded Product: Bis(4-nitrophenyl)amine, the publication is Russian Journal of Organic Chemistry (2005), 41(9), 1306-1315, database is CAplus.

Vicarious nucleophilic C-amination of nitrobenzene, 1-methyl-5-nitrobenzimidazole, and 1-methyl-6-nitrobenzimidazole in superbasic medium (potassium tert-butoxide-dimethyl sulfoxide) gave the corresponding amino-substituted derivatives The yield of the amination product of 1-methyl-5-nitrobenzimidazole considerably increased in the presence of CuCl. ESR monitoring of these reactions revealed formation of primary radical anions from the substrates. Possible reaction mechanisms are discussed.

Russian Journal of Organic Chemistry published new progress about 1821-27-8. 1821-27-8 belongs to catalysis-chemistry, auxiliary class Nitro Compound,Amine,Benzene, name is Bis(4-nitrophenyl)amine, and the molecular formula is C10H10O2, Recommanded Product: Bis(4-nitrophenyl)amine.

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

Schneider, Astrid published the artcileStructural modeling of alcohol dehydrogenase. Zinc complexes of acetyl- and benzoyl-pyridine, Quality Control of 22693-41-0, the publication is Zeitschrift fuer Anorganische und Allgemeine Chemie (2003), 629(12-13), 2122-2126, database is CAplus.

The N,O chelate ligands acetyl- and benzoyl-pyridine (L) react with ZnCl₂ to form 5- and 6-coordinate complexes of the compositions L₂ZnCl₂ and [L₂ZnCl]⁺. The Zn pentafluorothiophenolate and 2,4,6-triisopropylthiophenolate, however, yield tetrahedral complexes of composition L?Zn(SR)₂. These are structural models of the Zn(NOS₂) bonding situation during aldehyde attachment in the active center of the enzyme alc. dehydrogenase.

Zeitschrift fuer Anorganische und Allgemeine Chemie 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, Quality Control of 22693-41-0.

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

Schneider, Astrid published the artcileA thiolate-zinc complex with a Zn₄O₄ bicyclooctane framework, Application of 2,4,6-Triisopropylbenzenethiol, the publication is Zeitschrift fuer Anorganische und Allgemeine Chemie (2001), 627(8), 1771-1774, database is CAplus.

The reaction of ZnEt₂ with 2,4,6-triisopropylthiophenol (HSR^*) and N-methyl-2-hydroxymethylimidazole (ImCH₂OH) in MeOH yields the complex Zn₄(SR^*)₄(ImCH₂O)₃(OMe) with terminal SR^* and bridging ImCH₂O and MeO ligands. The structure of its Zn₄O₄ framework is that of a bicyclo[2.2.2]octane with Zn and O at the two apices. Crystal data: triclinic, P1?, a = 15.293(3), b = 17.453(4), c = 18.894(4) ?, ¦Á = 74.24(3), ¦Â = 71.44(3), ¦Ã = 73.15(3)¡ã, V = 4485.2(2) ?³, Z = 2, ¦Ñ_c = 1.29 g/cm³, ¦Ì(MoK¦Á) = 1.32 mm^-1, 6487 observed reflections with I > 2¦Ò(I), 901 refined parameters, R₁ = 0.091, wR₂ (all data) = 0.323.

Zeitschrift fuer Anorganische und Allgemeine Chemie 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, Application of 2,4,6-Triisopropylbenzenethiol.

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

Poliak, Peter published the artcileSubstitution and torsional effects on the energetics of homolytic N-H bond cleavage in diphenylamines, Application In Synthesis of 1821-27-8, the publication is Polymer Degradation and Stability (2015), 37-44, database is CAplus.

The systematic study of substituent effects and torsional deformation on the N-H bond dissociation enthalpies (BDE) in diphenylamine (DPA) and 33 mono-, 33 di- and 22 tetrasubstituted diphenylamines is presented. The DPA and its derivatives were studied by means of (U)B3LYP/6-311++G** quantum-chem. method. Calculated gas-phase bond dissociation enthalpies approximated from the total electronic energies are in very good agreement with available exptl. solution-phase data. The substitution in the ortho and para position(s) can considerably alter the N-H BDE. The largest N-H BDE decrease is caused by the hydrogen bond forming substituents (-OH, -NH₂) in the ortho positions and strong electron-donating groups placed in the para positions. Therefore, the improvement of the DPA antioxidant effectiveness, i.e. N-H BDE decrease, can be accomplished by the substitution in ortho or para position(s). The changes in mutual aromatic rings orientation in DPA mol. and studied derivatives affect the N-H BDE values considerably (increase by up to 28 kJ mol^-1). Hence, the mutual aromatic rings orientation alterations may induce neg. effect on the antioxidant ability of DPA based antioxidants. Presented results indicate that the deviations of the antioxidant activity in various solid-phase matrixes could have origin also in the mutual benzene ring orientation of the antioxidant mol.

Polymer Degradation and Stability published new progress about 1821-27-8. 1821-27-8 belongs to catalysis-chemistry, auxiliary class Nitro Compound,Amine,Benzene, name is Bis(4-nitrophenyl)amine, and the molecular formula is C12H9N3O4, Application In Synthesis of 1821-27-8.

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

Takeda, Susumu published the artcileFlotation separation of coarse-grained quartz from a mixture with hematite fines in alkaline media in relation to the adsorption of dodecylammonium acetate, Application In Synthesis of 2016-56-0, the publication is Nippon Kogyo Kaishi (1987), 103(1198), 859-64, database is CAplus.

Flotation separation of coarse-grained quartz with dodecylammonium acetate as the collector is interfered with when fine-grained hematites coexist. The reason for this was investigated. Both quartz and hematite become hydrophobic by adsorption of dodecylammonium acetate, and the hematite fines coat the surfaces of the quartz grains. The slime coating may cause the depression of quartz flotation.

Nippon Kogyo Kaishi 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 C9H5ClO2, Application In Synthesis of 2016-56-0.

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

Takeda, S. published the artcileCationic flotation of quartz from an artificial mixture with hematite using hexylamine, Category: catalysis-chemistry, the publication is Colloids and Surfaces (1988), 29(2), 221-32, database is CAplus.

The cationic flotation of quartz was carried out from an artificial mixture (1:1 by weight) of fine grained (-10 ¦Ìm) quartz and hematite, using hexylamine acetate (HAA) and dodecylamine acetate (DAA) as collectors. Selective flotation of quartz was possible in the pH range 9-10 using HAA. The adsorption densities of DAA and HAA on quartz and hematite were measured at pH 9.8 and the relation between the flotation behavior of both minerals and the surface coverage of collectors was established. Complete flotation of quartz and hematite required a surface coverage (¦È) of DAA of ?100% at pH 9.8, while complete flotation of quartz took place at ¦È ? 10% with HAA. The flotation behavior with DAA was explained by considering the adsorption of undissociated free amine. Zeta potential measurements were incorporated to interpret the difference in the adsorption behavior of both collectors on quartz and hematite.

Colloids and Surfaces 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 C10H10N2, Category: catalysis-chemistry.

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

Ritchie, Calvin D. published the artcileAcidity in nonaqueous solvents. VI. Further studies of weak acids in dimethyl sulfoxide solution, Name: Bis(4-nitrophenyl)amine, the publication is Journal of the American Chemical Society (1968), 90(11), 2821-4, database is CAplus.

The potentiometric method, employing a glass electrode, was used to determine the acidities of a series of benzoic acids, several hydrocarbon acids, and some aniline indicators in pure Me2SO solutions The data provide evidence for an important effect of H bonding in protic solvents which decreases the effect of substituents on the acidities of benzoic acids. Studies of the hydrocarbon acids indicate that dispersion interactions of the conjugate bases with Me2SO cause a greater dissociation in this solvent than in protic solvents such as MeOH. The data for the aniline indicators provide a partial check on the validity of the H-acidity function generated by their use.

Journal of the American Chemical Society published new progress about 1821-27-8. 1821-27-8 belongs to catalysis-chemistry, auxiliary class Nitro Compound,Amine,Benzene, name is Bis(4-nitrophenyl)amine, and the molecular formula is C12H9N3O4, Name: Bis(4-nitrophenyl)amine.

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

Nishimura, Kazutoshi published the artcilePhosphenium-Cation-Mediated Formal Cycloaddition Approach to Benzophospholes, SDS of cas: 23897-16-7, the publication is Chemistry – A European Journal (2018), 24(50), 13089-13092, database is CAplus and MEDLINE.

A phosphenium-cation-mediated formal [3+2]-cycloaddition reaction of internal alkynes is reported. The reaction proceeds under metal-free conditions to give the corresponding C-P rearranged benzophospholes regioselectively, even when ortho- and para-substituted arylphosphine oxides are starting substrates. Mechanistic studies by ³¹P{¹H} NMR anal. suggest an involvement of three-membered phosphirenium cation species and C-P rearrangement prior to a ring closure for benzophosphole skeleton formation.

Chemistry – A European Journal published new progress about 23897-16-7. 23897-16-7 belongs to catalysis-chemistry, auxiliary class Aryl phosphine ligand,Mono-phosphine Ligands, name is Dimesitylphosphine oxide, and the molecular formula is C18H23OP, SDS of cas: 23897-16-7.

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