Month: December 2022

Hesp, Kevin D. published the artcilePalladium-Catalyzed Mono-¦Á-arylation of Acetone with Aryl Halides and Tosylates, Recommanded Product: 4-(2-(Di(adamantan-1-yl)phosphino)phenyl)morpholine, the publication is Journal of the American Chemical Society (2011), 133(14), 5194-5197, database is CAplus and MEDLINE.

The first example of selective Pd-catalyzed mono-¦Á-arylation of acetone employing aryl chlorides, bromides, iodides, and tosylates is reported. The use of appropriately designed P,N-ligands proved to be the key to controlling the reactivity and selectivity. The reaction affords good yields with substrates containing a range of functional groups at modest Pd loadings using Cs₂CO₃ as the base and employing acetone as both a reagent and the solvent.

Journal of the American Chemical Society 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, Recommanded Product: 4-(2-(Di(adamantan-1-yl)phosphino)phenyl)morpholine.

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

Alsabeh, Pamela G. published the artcilePalladium-catalyzed synthesis of indoles via ammonia cross-coupling-alkyne cyclization, Safety of 4-(2-(Di(adamantan-1-yl)phosphino)phenyl)morpholine, the publication is Chemical Communications (Cambridge, United Kingdom) (2011), 47(24), 6936-6938, database is CAplus and MEDLINE.

The synthesis of indoles via the metal-catalyzed cross-coupling of ammonia is reported for the first time; the developed protocol also allows for the unprecedented use of methylamine or hydrazine as coupling partners. These Pd/Josiphos-catalyzed reactions proceed under relatively mild conditions for a range of 2-alkynylbromoarenes.

Chemical Communications (Cambridge, United Kingdom) 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, Safety of 4-(2-(Di(adamantan-1-yl)phosphino)phenyl)morpholine.

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

Alsabeh, Pamela G. published the artcileAn Examination of the Palladium/Mor-DalPhos Catalyst System in the Context of Selective Ammonia Monoarylation at Room Temperature, Related Products of catalysis-chemistry, the publication is Chemistry – A European Journal (2013), 19(6), 2131-2141, database is CAplus and MEDLINE.

An examination of the [{Pd(cinnamyl)Cl}₂]/Mor-DalPhos (Mor-DalPhos=di(1-adamantyl)-2-morpholinophenylphosphine) catalyst system in Buchwald-Hartwig aminations employing ammonia was conducted to better understand the catalyst formation process and to guide the development of precatalysts for otherwise challenging room-temperature ammonia monoarylations. The combination of [{Pd(cinnamyl)Cl}₂] and Mor-DalPhos afforded [(¦Ê²-P,N-Mor-DalPhos)Pd(¦Ç¹-cinnamyl)Cl] (2), which, in the presence of a base and chlorobenzene, generated [(¦Ê²-P,N-Mor-DalPhos)Pd(Ph)Cl] (1 a). Halide abstraction from 1 a afforded [(¦Ê³-P,N,O-Mor-DalPhos)Pd(Ph)]OTf (5), bringing to light a potential stabilizing interaction that is offered by Mor-DalPhos. An examination of [(¦Ê²-P,N-Mor-DalPhos)Pd(aryl)Cl] and related precatalysts for the coupling of ammonia and chlorobenzene at room temperature established the suitability of 1 a in such challenging applications. The scope of reactivity for the use of 1 a (5 mol %) encompassed a range of (hetero)aryl (pseudo)halides (X=Cl, Br, I, OTs) with diverse substituents (alkyl, aryl, ether, thioether, ketone, amine, fluoro, trifluoromethyl, and nitrile), including chemoselective arylations.

Chemistry – A European Journal 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, Related Products of catalysis-chemistry.

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

Tachikawa, Hiroto published the artcileStructures and electronic states of trimer radical cations of coronene: DFT-ESR simulation study, Related Products of catalysis-chemistry, the publication is Physical Chemistry Chemical Physics (2022), 24(17), 10318-10324, database is CAplus and MEDLINE.

Coronene (C₂₄H₁₂), a charge transfer complex with low-cost and high-performance energy storage, has recently attracted attention as a model mol. of graphene nano-flakes (GNFs). The stacking structures of the trimer radical cation correlate strongly with the conduction states of the GNFs. In the present paper, the structures and electronic states of the monomer, dimer and trimer radical cations of coronene were investigated by means of d. functional theory calculations In particular, the proton hyperfine coupling constants of these species were determined The radical cation of coronene+ (monomer) showed two structures corresponding to the ²A_u and ²B_3u states due to the Jahn-Teller effect. The 2Au state was more stable than the ²B_3u state, although the energy difference between the two states was only 0.03 kcal mol^-1. The dimer and trimer radical cations took stacking structures distorted from a full overlap structure. The intermol. distances of the mol. planes were 3.602 ? (dimer) and 3.564 and 3.600 ? (trimer). The binding energies of the dimer and trimer were calculated to be 8.7 and 13.3 kcal mol^-1, resp. The spin d. was equivalently distributed on both coronene planes in the dimer cation. In contrast, the central plane in the trimer cation had a larger spin d., ¦Ñ = 0.72, than the upper and lower planes, both with ¦Ñ = 0.14. The proton hyperfine coupling constants calculated from these structures and the electronic states of the monomer, dimer, and trimer radical cations of coronene were in excellent agreement with previous ESR spectra of coronene radical cations. The structures and electronic states of (coronene)_n⁺ (n = 1-3) were discussed on the basis of the theor. results.

Physical Chemistry Chemical Physics 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 C26H41N5O7S, Related Products of catalysis-chemistry.

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

Forlani, Luciano published the artcileMechanism of the formation of 1,2,4-thiadiazoles by condensation of aromatic thioamides and of N-substituted thioureas, Application of 1,1-Dimethylthiourea, the publication is Journal of Heterocyclic Chemistry (2000), 37(1), 63-69, database is CAplus.

The condensation reaction of thiobenzamide (as well as thionicotinamide and isothionicotinamide) in the presence of DMSO and of an acid affords 3,5-diphenyl-1,2,4-thiadiazole. Under the same exptl. conditions, N-substituted thioureas are also condensed to 1,2,4-thiadiazole derivatives; their structure is ascertained by spectroscopic properties and by X-ray diffraction. Some information on the mechanism of thiadiazole formation from both starting classes of compounds, thiobenzamides and N-substituted thiourea, is collected and discussed.

Journal of Heterocyclic Chemistry 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, Application of 1,1-Dimethylthiourea.

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

Lickiss, Paul D. published the artcileRate increases in the fluorination of bulky chlorosilanes caused by ultrasound or by water, HPLC of Formula: 312-40-3, the publication is Journal of Organometallic Chemistry (1996), 510(1-2), 167-72, database is CAplus.

The conversion of bulky chlorosilanes to fluorosilanes under anhydrous conditions with hexafluorosilicate salts is accelerated by ultrasound. The fluorination of sterically hindered chlorosilanes such as ^tBuPh₂SiCl, in the absence of ultrasound, is greatly accelerated by the addition of H₂O to the reaction mixture

Journal of Organometallic Chemistry 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, HPLC of Formula: 312-40-3.

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

Fan, Shuang published the artcileMonodispersed poly(4-vinylpyridine) spheres supported Fe(III) material: An efficient and reusable catalyst for benzylic oxidation, Quality Control of 457-68-1, the publication is Journal of Molecular Catalysis A: Chemical (2015), 186-192, database is CAplus.

A novel ferric chloride immobilized poly(4-vinylpyridine) (P4VP) catalyst was developed via a coordination chem.-based approach. The pyridine moiety of poly(4-vinylpyridine) spheres functioned as the nitrogen donor to bind iron ions, as well as to decrease the amount of pyridine used in the catalytic reaction system. The monodispersed catalyst was well dispersed in the organic solvent during the catalytic procedure, taking advantage of its nanomorphol. and uniform size. The catalytic activity of various monodispersed catalysts based different mass fractions of the divinylbenzene (DVB) was investigated, meanwhile the capacities of supported Fe(III) in the various catalysts were also discussed. The P4VPDVB_10%-Fe(III) catalyst exhibited high catalytic activity in the benzylic oxidation of benzylic methylenes and secondary benzylic alcs. It was easily separated from the reaction system and reused several times without obvious degradation of catalytic activity. Moreover, leaching tests suggested that the as-synthesized P4VPDVB_10%-Fe(III) catalyst was a true heterogeneous catalyst without significant metal leaching.

Journal of Molecular Catalysis A: Chemical published new progress about 457-68-1. 457-68-1 belongs to catalysis-chemistry, auxiliary class Fluoride,Benzene, name is Bis(4-fluorophenyl)methane, and the molecular formula is C13H10F2, Quality Control of 457-68-1.

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

Sun, Lixin published the artcileCopolymerization of ethylene and butadiene with supported titanium catalyst, Application In Synthesis of 312-40-3, the publication is Journal of Polymer Science, Part B: Polymer Physics (1988), 26(10), 2113-26, database is CAplus.

The copolymerization of ethylene and butadiene with a supported titanium catalyst (TiCl₄/MgCl₂/Et benzoate/Ph₂SiCl₂/AlEt₃) was described. The resulting products were characterized by IR, ¹³C NMR, x-ray diffraction, differential thermal anal., electron microscopy, and solvent extraction The butadiene units were substantially in trans-1,4-configuration and blocked sequences. Both ethylene and butadiene blocks formed crystalline phases. The presence of unsaturated bonds made it possible to graft Me methacrylate and maleic anhydride. The influences of monomer composition, temperature, Al/Ti ratio, catalyst concentration, and solvents on the copolymerization were investigated.

Journal of Polymer Science, Part B: Polymer Physics 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 C6H3ClFNO2, Application In Synthesis of 312-40-3.

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

Wang, Chao-Nan published the artcileElectrochemical coupling halobenzene into biphenyl on a reusable Pd nanoparticle-coated carbon-paper electrode at ambient conditions, Quality Control of 613-33-2, the publication is New Journal of Chemistry (2021), 45(8), 3997-4003, database is CAplus.

Electrochem. organic synthesis (EOS) employing electrons to directly activate the reactants can readily complete the chem. conversion under mild conditions. Here, it presented an efficient electrochem. coupling halobenzene into biphenyl on a Pd nanoparticle-coated cathode. The biphenyl product can be obtained with a yield up to 77% at 35 mA, 6 h (3.9 F mol^-1). In addition, after consecutive fifth run of the coupling reaction, the yield still remained at ca. 40%, suggesting its considerable recyclable capacity. In addition, the preliminary kinetics study via the off-line gas chromatog. anal. of the reaction mixture shows a two-section reaction process, including the introduction process (IP) and fast conversion process (FCP). Further, the estimated reaction kinetics constant value of 0.196 min^-1 for FCP suggests a more effective conversion than that obtained by the previous study. This study adopts a simple way to fabricate a low-cost and reusable Pd electrode, achieving a high-efficiency electrochem. strategy for the Ullmann-type coupling reaction at mild conditions, and holds a great promise to extend this synthesis route to other important organic synthesis.

New Journal of Chemistry 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 C48H47FeP, Quality Control of 613-33-2.

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

Meng, Ting published the artcileSelf-Assembly of Triphenylamine Macrocycles and Co-assembly with Guest Molecules at the Liquid-Solid Interface Studied by STM: Influence of Different Side Chains on Host-Guest Interaction, Safety of Coronene, the publication is Langmuir (2022), 38(11), 3568-3574, database is CAplus and MEDLINE.

The side chains of macrocyclic mols. have a non-negligible effect on the two-dimensional (2D) supramol. networks at the liquid/solid interface. In this study, we investigated the self-assembly behaviors of two conjugated triphenylamine (TPA) macrocycles modified with different alkyl chains, and constructed the host-guest supramol. nanopatterns on the highly oriented pyrolytic graphite (HOPG) by scanning tunneling microscope (STM). Combined with d. functional theory (DFT) calculations, how different side chains affected the host-guest interaction were discussed. This work will provide insights into constructing 2D host-guest dynamic coassembly on the surface.

Langmuir 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, Safety of Coronene.

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