Catalysis-chemistry

Kashiwabara, Taigo published the artcilePd-catalyzed desulfonylative homocoupling of arenesulfonyl chlorides in the presence of hexamethyldisilane forming biaryls, COA of Formula: C9H9F5Si, the publication is Tetrahedron Letters (2005), 46(42), 7125-7128, database is CAplus.

Arenesulfonyl chlorides undergo desulfonylative homo-coupling upon heating with hexamethyldisilane in the presence of Pd₂(dibenzylideneacetone)₃.CHCl₃ as a precatalyst to afford biaryls. Diaryl sulfides are occasionally formed as byproducts.

Tetrahedron Letters published new progress about 1206-46-8. 1206-46-8 belongs to catalysis-chemistry, auxiliary class Organic Silicones, name is Trimethyl(perfluorophenyl)silane, and the molecular formula is C9H9F5Si, COA of Formula: C9H9F5Si.

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

Kashiwabara, Taigo published the artcileDecarbonylative Coupling of Fluorobenzoyl Chlorides with Hexamethyldisilane in the Presence of a Palladium Complex Catalyst: Extremely Facile Decarbonylation of Pentafluorobenzoyl-Pd Complex Relevant to C₆F₅SiMe₃ Formation, Application of Trimethyl(perfluorophenyl)silane, the publication is Organometallics (2006), 25(19), 4648-4652, database is CAplus.

Pd-phosphite complexes (PdCl₂(PhCN)₂ + P(OEt₃)₃ or P(OPr)₃ most effective) catalyze the reaction of pentafluorobenzoyl chloride with hexamethyldisilane to selectively form pentafluorophenyltrimethylsilane as virtually the sole product. The reaction of 3,5-difluoro- or 4-fluorobenzoyl chloride was less selective, giving a mixture of corresponding benzoyl- and phenylsilanes. Oxidative addition of pentafluorobenzoyl chloride with Pd(PPh₃)₄ or with Pd[P(OEt)₃]₂ generated in situ proceeds readily, but decarbonylation occurs, giving trans-C₆F₅PdClL₂ (L = PPh₃, P(OEt)₃), selectively. The crystal and mol. structures of trans-C₆F₅PdCl(PPh₃)₂ were determined by x-ray crystallog.

Organometallics published new progress about 1206-46-8. 1206-46-8 belongs to catalysis-chemistry, auxiliary class Organic Silicones, name is Trimethyl(perfluorophenyl)silane, and the molecular formula is C9H9F5Si, Application of Trimethyl(perfluorophenyl)silane.

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

Kozuka, Hiroto published the artcileEnhancement of thermal stability of structural color by the substituent effect in polyhedral oligomeric silsesquioxane in block copolymers, Related Products of catalysis-chemistry, the publication is European Polymer Journal (2022), 111360, database is CAplus.

We prepared high-mol.-weight block copolymers (BCPs) composed of polystyrene (PS) brush blocks and polyhedral oligomeric silsesquioxane (POSS)-tethered polynorbornenes with variable composition ratios. By changing the substituents at the vertex of POSS from iso-Bu groups to cyclopentyl ones, we evaluated the substituent effect on structural color and thermal stability against annealing. The BCPs modified with iso-Bu groups showed clear structural color, while color changes were observed after annealing. By replacing to cyclopentyl groups, structural color was also presented, and improvement of thermal resistance was observed by heating. From the series of thermal analyses, it was proposed that thermal enhancement of cyclopentyl-substituted POSS domains could be responsible for the improvement of thermal stability of structural color.

European Polymer Journal published new progress about 13822-56-5. 13822-56-5 belongs to catalysis-chemistry, auxiliary class Organic Silicones, name is 3-(Trimethoxysilyl)propan-1-amine, and the molecular formula is C6H17NO3Si, Related Products of catalysis-chemistry.

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

Kaiho, Kunio published the artcileVolcanic temperature changes modulated volatile release and climate fluctuations at the end-Triassic mass extinction, Recommanded Product: Coronene, the publication is Earth and Planetary Science Letters (2022), 117364, database is CAplus.

Emplacement of the Central Atlantic Magmatic Province (CAMP) is thought to have triggered global environmental changes and the end-Triassic mass extinction (ETE). However, the mechanisms linking volcanism and environmental change are unclear. Here we provide new insight into these linkages by measuring the abundance of both sedimentary five- to six-ring polycyclic aromatic hydrocarbons (PAHs) and mercury from strata deposited in shallow marine environments across the ETE at the GSSP Kuhjoch section in Austria and St. Audrie’s Bay section in the UK. To contextualize these data, we report results from laboratory experiments measuring the production of SO₂ and CO₂ during heating of limestone and mudstone. ETE sediments record parallel enrichments of mercury and five- to six-ring PAHs, which could have been produced by intrusive magma (mainly sills) and lava flows during the early stage of the CAMP emplacement; these data indicate a direct link between massive gas emission from sill contact metamorphism and the ETE. The fraction of coronene – a highly condensed six-ring PAH that requires greater energy to form compared to smaller PAHs – accumulated in the sediments during these initial volcanic events is low, and it coincides with the terrestrial plant turnover and initial marine extinction. Coronene increases to medium values coinciding with the final marine extinction level. Our heating experiments of typical carbonate and mudstone materials show that relatively low temperature heating (>350¡ãC) by sills releases massive amounts of SO₂ on a 100 yr time scale, whereas higher temperature heating (500-600¡ãC) forms more CO₂ on the same time scale. The combination of our end-Triassic geochem. data and laboratory results implies that low heating by sills caused SO₂-dominated gas emission to the stratosphere and low CO₂ emission, inducing global cooling that could have precipitated the mass extinction. The subsequent increase in coronene content indicates higher volcanic temperature that would have volatilized CO₂ rich gas; the consequence was a switch to greater CO₂ release and long-term (>105 yr) global warming.

Earth and Planetary Science Letters 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, Recommanded Product: Coronene.

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

Ohshita, Joji published the artcileSynthesis and Chromic Behaviors of Dithienosiloles with Push-Pull Substituents Toward VOC Detection, Related Products of catalysis-chemistry, the publication is Molecular Crystals and Liquid Crystals (2010), 1-9, database is CAplus.

2-Methylthio- and 2-n-hexylthienyl-6-(tricyanoethenyl)-4,4-diphenyldithienosilole were prepared as novel push-pull type compounds These compounds exhibit solvatochromic behaviors with respect to their UV-vis absorption and emission spectra. Clear vapor chromism is also observed for their thin solid films and the color changed clearly on exposure of the films to organic solvent vapors, indicating the potential applications to VOC sensors.

Molecular Crystals and Liquid Crystals 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, Related Products of catalysis-chemistry.

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

Zhao, Hang published the artcileEfficient broadband terahertz generation from organic crystal BNA using near infrared pump, Application of N-Benzyl-2-methyl-4-nitroaniline, the publication is Applied Physics Letters (2019), 114(24), 241101/1-241101/4, database is CAplus.

We report on terahertz (THz) generation from organic crystal N-benzyl-2-methyl-4-nitroaniline using a 1.15-1.55 ¦Ìm near IR pump. We observed a very large emission spectrum extending up to 7 THz, compared to 2.5 THz from a Ti:Sa pump in previous reports. The maximum optical-to-THz conversion efficiency in our experiment was 0.8% at a repetition rate of 1 kHz and without saturation, leading to a peak elec. field of 1 GV/m. Our results show pronounced phase matching privilege for intense terahertz generation using a pump in the 1.15-1.25 ¦Ìm range where high energy near IR pump sources operate. (c) 2019 American Institute of Physics.

Applied Physics Letters 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 C4HN5, Application of N-Benzyl-2-methyl-4-nitroaniline.

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

Shi, Yongjie published the artcileDirect Synthesis of Chiral NH Lactams via Ru-Catalyzed Asymmetric Reductive Amination/Cyclization Cascade of Keto Acids/Esters, Safety of 3-Benzoylpropionicacid, the publication is Organic Letters (2020), 22(7), 2707-2713, database is CAplus and MEDLINE.

A broadly applicable synthesis of enantioenriched NH lactams e.g., I through a one-pot asym. reductive amination/cyclization sequence of easily available keto acids/esters e.g., C₆H₅C(O)(CH₂)₂C(O)OMe was reported. Such cascade processes alleviate the demand for protecting group manipulations as well as intermediate purification This strategy is capable of constructing enantioenriched lactams e.g., I in generally high yield and with excellent enantioselectivities (up to 97% ee). Scalable and concise syntheses of key drug intermediates have further displayed the importance of this methodol.

Organic Letters published new progress about 2051-95-8. 2051-95-8 belongs to catalysis-chemistry, auxiliary class Carboxylic acid,Benzene,Ketone, name is 3-Benzoylpropionicacid, and the molecular formula is C3H5F3O, Safety of 3-Benzoylpropionicacid.

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

Wang, Chang-Sheng published the artcileRegio- and Stereoselective Synthesis of Enol Carboxylate, Phosphate, and Sulfonate Esters via Iodo(III)functionalization of Alkynes, Related Products of catalysis-chemistry, the publication is Organic Letters (2022), 24(1), 430-434, database is CAplus and MEDLINE.

Synthesis of ¦Â-Iodo(III)enol carboxylates, I (R¹ = Et, Me, Bu, t-Bu; R² = Et, Ph, thiophen-2-yl, etc.; R³ = 4-oxopentanoyl, benzoyl, 2,2-dimethylpropyl, etc.) phosphates, I (R³ = diethoxyphosphoroso, diphenoxyphosphoroso, dimethoxyphosphoroso, diphenylphosphoroso) and tosylates I (R³ = Ts) can be efficiently performed through regio- and stereoselective iodo(III)functionalization of alkynes R¹CCR². The combination of 1,2-benziodoxole, 1-chloro-1,3-dihydro-3,3-bis(trifluoromethyl)- and silver salt has proven to generate a versatile cationic iodine(III) electrophile to activate alkynes and engage various carboxylic acids R⁴COOH (R⁴ = Me, Ph, 2-phenylethenyl, etc.), tri-Et phosphate and p-toluenesulfonic acid as nucleophiles. The ¦Â-iodo(III)enol esters serve as starting materials for the synthesis of multisubstituted alkenes I through sequential cross-coupling of the C-I(III) and C-O bonds.

Organic Letters published new progress about 118-90-1. 118-90-1 belongs to catalysis-chemistry, auxiliary class Carboxylic acid,Benzene,Natural product, name is 2-Methylbenzoic acid, and the molecular formula is C12H16N2O2, Related Products of catalysis-chemistry.

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

Nemati, Mohammad published the artcileImmobilization of Gd(III) complex on Fe₃O₄: A novel and recyclable catalyst for synthesis of tetrazole and S-S coupling, COA of Formula: C14H10O4S2, the publication is Polyhedron (2019), 75-84, database is CAplus.

A novel catalysts was prepared by anchoring a Gd(III) complex with OH groups on the surface of Fe₃O₄. The catalysts was characterized by FTIR, TGA, XRD, EDX, VSM, and ICP-OES techniques and tested in the synthesis of tetrazoles and S-S coupling. The catalyst has several advantages including easily recovery from the reaction mixture by magnetic field, several consecutive cycles without noticeable change in its catalytic activity, the use of green solvent, the use of aspartic acid as green ligand, chem. and phys. stability of the obtained catalyst, short reaction time and good to excellent isolated yields of all products.

Polyhedron published new progress about 119-80-2. 119-80-2 belongs to catalysis-chemistry, auxiliary class sulfides,Carboxylic acid,Benzene, name is 2,2′-Dithiodibenzoic acid, and the molecular formula is C14H10O4S2, COA of Formula: C14H10O4S2.

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

Molaei, Somayeh published the artcileSynthesis and characterization of MCM-41@AMPD@Zn as a novel and recoverable mesostructured catalyst for oxidation of sulfur containing compounds and synthesis of 5-substituted tetrazoles, SDS of cas: 119-80-2, the publication is Microporous and Mesoporous Materials (2018), 241-250, database is CAplus.

Zinc bound to mesoporous silica MCM-41 functionalized with (3-chloropropyl)trimethoxysilane and 2-amino-2-methyl-1,3-propanediol was prepared as a recyclable catalyst for solvent-free oxidation of sulfides and thiols with H₂O₂ to form sulfides and disulfides, resp., and for the cycloaddition of NaN₃ to nitriles in PEG-400 to yield tetrazoles. The catalyst was used eight times for oxidation and cycloaddition reactions with < 10% decrease in yield over the eight reaction cycles.

Microporous and Mesoporous Materials published new progress about 119-80-2. 119-80-2 belongs to catalysis-chemistry, auxiliary class sulfides,Carboxylic acid,Benzene, name is 2,2′-Dithiodibenzoic acid, and the molecular formula is C14H10O4S2, SDS of cas: 119-80-2.

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