Category: 613-33-2

Abdus Salam, Muhammad published the artcileElucidating the role of NiMoS-USY during the hydrotreatment of Kraft lignin, Safety of 4,4′-Dimethyldiphenyl, the publication is Chemical Engineering Journal (Amsterdam, Netherlands) (2022), 442(Part_2), 136216, database is CAplus.

Major hurdles in Kraft lignin valorization require selective cleavage of etheric and C-C linkages and subsequent stabilization of the fragments to suppress repolymn. reactions to yield higher monomeric fractions. In this regard, we report the development of efficient NiMo sulfides and ultra-stable Y zeolites for the reductive liquefaction and hydrodeoxygenation of Kraft lignin in a Parr autoclave reactor at 400¡ãC and 35 bar of H₂ (@25¡ãC). Comparing the activity test without/with catalyst, it is revealed that NiMo sulfides over ultra-stable Y zeolites (silica/alumina = 30) achieved a significant reduction (?50%) of the re-polymerized solid residue fraction leading to a detectable liquid product yield of 30.5 wt% with a notable monocyclic and alkylbenzenes selectivity (?61 wt%). A phys. mixture counterpart, consisting of hydrothermally synthesized unsupported NiMoS and Y30, on the other hand, shows lower selectivity for such fractions but higher stabilization of the lignin fragments due to enhanced access to the active sites. Moreover, an extended reaction time with higher catalyst loading of the impregnated NiMoY30 facilitated a remarkable alkylbenzene (72 wt%) selectivity with an increased liquid yield of 38.9 wt% and a reduced solid residue of 16.4 wt%. The reason for the high yield and selectivity over NiMoY30, according to the catalyst characterization (H₂-TPR, XPS, TEM) can be ascribed to enhanced stabilization of depolymerized fragments via H₂-activation at a lower temperature and high hydrodeoxygenation ability. In addition, the better proximity of the acidic and deoxygenation sites in NiMoY30 was beneficial for suppressing the formation of polycyclic aromatics

Chemical Engineering Journal (Amsterdam, Netherlands) 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, Safety of 4,4′-Dimethyldiphenyl.

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

Gao, Mingyang published the artcileZeolite-encaged palladium catalysts for heterogeneous Suzuki-Miyaura cross-coupling reactions, Quality Control of 613-33-2, the publication is Catalysis Today, database is CAplus.

Herein, zeolite-encaged Pd particles, namely Pd@MFI, have been successfully prepared via an in-situ hydrothermal strategy and investigated as promising heterogeneous catalysts for Suzuki-Miyaura cross-coupling reactions. Characterization results demonstrate that high dispersed Pd particles with apparent sizes of 1-2 nm have been encaged in and efficiently stabilized by the matrix of MFI zeolite. The as-prepared Pd@MFI catalysts are active in the Suzuki-Miyaura coupling reaction between bromobenzene and phenylboronic acid, and the presence of basic sites adjacent to Pd sites are crucial to achieving high catalytic activity via effective cooperation. Pd@K-ZSM-5 was optimized for the coupling between bromobenzene and phenylboronic acid and catalyze the reaction with a low apparent activation energy value of 41.2 kJ/mol. Pd@K-ZSM-5 also showed good stability and can be recycled for at least five times without obvious loss in activity, demonstrating its great potential as a heterogeneous catalyst for Suzuki-Miyaura cross-coupling reactions. Encapsulation of metal species in zeolite matrix offers a big opportunity to the heterogenization of homogeneous metal catalysts for practical chem. transformations.

Catalysis Today 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, Quality Control of 613-33-2.

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

Xia, Hongyu published the artcileVisible Light Induced Aerobic Coupling of Arylboronic Acids Promoted by Hydrazone, Quality Control of 613-33-2, the publication is Advanced Synthesis & Catalysis (2022), 364(5), 922-929, database is CAplus.

A visible-light-induced oxidative coupling of arylboronic acids was developed for the synthesis of biaryls Ar¹Ar² [Ar¹ = Ar² = Ph, 4-MeC₆H₄, 4-FC₆H₄, etc.; Ar¹ = 4-BrC₆H₄, 4-MeC₆H₄, 4-FC₆H₄, etc.; Ar₂ = 4-H(O)CC₆H₄, 3-MeOC₆H₄, 4-AcC₆H₄, etc.]. The reaction that employed polydentate hydrazones as the bifunctional catalyst works smoothly under room temperature It was compatible with a wide range of functional group. The study of UV-Vis spectrum indicated that hydrazone and its complex with CuI show major absorptions upon visible-light, which secures the dual role of hydrazone as both ligand and photocatalyst in this reaction. Hence, the reaction was proposed to involve stepwise transmetallations, photo-induced oxidations, and reductive elimination.

Advanced Synthesis & Catalysis 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 C5H7N3O, Quality Control of 613-33-2.

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

Ma, Xufeng published the artcileMixed Alkyl/Aryl Diphos Ligands for Iron-Catalyzed Negishi and Kumada Cross Coupling Towards the Synthesis of Diarylmethane, COA of Formula: C14H14, the publication is ChemCatChem (2021), 13(24), 5134-5140, database is CAplus.

Mixed alkyl/aryl diphos ligands have been prepared and their application in iron-catalyzed cross coupling of benzylic chlorides with diaryl zinc (Negishi) or aryl Grignard reagents (Kumada) towards the synthesis of diarylmethane has been evaluated. The iron-diphos catalytic system exhibited the enhanced activity and selectivity in the two coupling reactions. The electron-rich mixed PPh₂/PCy₂ ligands outperformed their sym. PPh₂ congeners, and led to decreased homocoupling byproduct formation. It indicates that the electronic effect of the ligands plays an important role in the catalytic performance. The Fe catalyst bearing an electron-rich PCy₂ substituent and a sterically demanding tert-Bu on ethene backbone exhibited the best catalytic performance and good functional group tolerance in the two cross coupling reactions.

ChemCatChem 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, COA of Formula: C14H14.

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

Haroon, Haamid published the artcileMetal-Organic Framework-Derived p-Type Cu₃P/Hexagonal Boron Nitride Nanostructures for Photocatalytic Oxidative Coupling of Aryl Halides to Biphenyl Derivatives, Related Products of catalysis-chemistry, the publication is ACS Applied Nano Materials (2022), 5(2), 2006-2017, database is CAplus.

The C-C coupling is an efficient route toward the synthesis of sym. biphenyls from aryl halides. Herein, a cost-effective visible nanophotocatalyst system (Cu₃P/hBN), consisting of heterogeneous, nanoporous, and nanosized Cu₃P (derived from HKUST MOF) and hexagonal boron nitride (hBN), is employed for the photocatalytic coupling of aryl halides. The catalyst efficiently executes the aryl halide coupling to biphenyls under visible light and in the presence of air at room temperature The electron/hole pairs can be readily generated upon visible light excitation of the Cu₃P nanophotocatalyst, but the low band gap of Cu₃P promotes the fast recombination of generated electrons/holes, thereby rendering Cu₃P inefficient for photocatalysis. However, the association of a small amount of hBN, which is a structural analog of graphene and carbon nitride, with Cu₃P to form the Cu₃P/hBN composite promotes the separation of electrons as hBN can provide its surface to the excited electrons of Cu₃P, making them active to act on surface-adsorbed active reactant mols., whereas the holes remain confined to the valence band of Cu₃P. Cu₃P is a P-type semiconductor that provides Cu (+1) active sites that change to Cu (+2) during the photocatalytic cycle. The oxidized active sites consisting of Cu (+2) promote further enhancement of electrostatic interactions between the catalyst and the attached aromatic halide mols. The excited electrons generated in the catalyst upon light exposure act on oxygen mols. to further lead to superoxide radical anion (O₂^-?) radical formation. The formed O₂^-? radicals then act on activated halide mols. and convert them to biphenyls.

ACS Applied Nano Materials 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, Related Products of catalysis-chemistry.

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

Bhat, Sajad published the artcileSuitably Band-aligned MOF-Derived Ni₂P/MnO₂ Heterostructure with Ni(I) Coordination Surface Sites for Self-Coupling of Aryl Halides to Biaryls, Formula: C14H14, the publication is Chemistry – An Asian Journal (2022), 17(4), e202101279, database is CAplus and MEDLINE.

An efficient photo-redox strategy for the aryl-aryl self-coupling of aryl halides through a heterogeneous catalysis route has been demonstrated. A coordinatively unsaturated Ni₂P surface with the enhanced photochem. property upon hetero-structuring with ¦Ä-MnO₂ affects the organic transformation to biaryls with impressive yield and photo-conversion efficiency. The dual-role of the Ni₂P catalyst with its participation as the catalytic active surface and the photo-redox center distinguishes the organic transformation achieved herein with other catalytic and photocatalytic aryl-aryl self-coupling.

Chemistry – An Asian Journal 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, Formula: C14H14.

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

Liu, Yaxu published the artcileVersatile and Highly Efficient trans-[Pd(NHC)Cl₂(DMS/THT)] Precatalysts for C-N and C-C Coupling Reactions in Green Solvents, Synthetic Route of 613-33-2, the publication is European Journal of Organic Chemistry (2022), 2022(14), e202200309, database is CAplus.

A straightforward synthetic procedure to well-defined, air- and moisture- stable trans-[Pd(NHC)Cl₂(DMS/THT)] (NHC=IPr, SIPr, IMes, IPrCl, IPr*, IPr#) pre-catalysts was reported. These complexes were obtained by reacting NHC.HCl imidazolium salts with trans-[PdCl₂(DMS/THT)2] precursors with the assistance of the weak base K₂CO₃ in green acetone at40¡ãC. The scalability of this protocol was demonstrated. The catalytic activity of the synthesized complexes was studied in the Buchwald-Hartwig and Suzuki-Miyaura reactions. Remarkably, most of the synthesized complexes exhibited higher catalytic activity with respect to their PEPPSI congeners in the Buchwald-Hartwig amination in 2-MeTHF. In particular, complex trans-[Pd(IPr#)Cl₂(DMS)] enabled the coupling of various (hetero)aryl chlorides and primary/secondary amines with a 0.2 mol% catalyst loading. In addition, trans-[Pd(IPr)Cl₂(DMS)] showed excellent performance in the room-temperature Suzuki-Miyaura reaction involving various (hetero)aryl chlorides and aryl boronic acids. In summary, the synthesized complexes, especially trans-[Pd(NHC)Cl₂(DMS)], was considered as greener alternatives to classical PEPPSI type catalysts based on the lower toxicity of the throw-away DMS ligand compared to 3-chloropyridine.

European Journal of Organic 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 C14H14, Synthetic Route of 613-33-2.

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

Dorval, Celine published the artcileCobalt-Catalyzed C(sp²)-CN Bond Activation: Cross-Electrophile Coupling for Biaryl Formation and Mechanistic Insight, Application of 4,4′-Dimethyldiphenyl, the publication is ACS Catalysis (2020), 10(21), 12819-12827, database is CAplus.

Herein, we report a cross-electrophile coupling of benzonitrile derivatives and aryl halides with a simple cobalt-based catalytic system under mild conditions to form biaryl compounds Even though the cobalt catalyst is able to activate the C(sp²)-CN bond alone, the use of the AlMe₃ Lewis acid enhances the reactivity of benzonitriles and improves the cross-selectivity with barely any influence on the functional group compatibility. X-ray structure determination of an original low-valent cobalt species combined with catalytic and stoichiometric reactions reveals a catalytically active cobalt(I) species toward the aryl halide partner. On the other hand, exptl. insights, including cyclic voltammetry experiments, suggest the involvement of a cobalt complex of a lower oxidation state to activate the benzonitrile derivative Finally, d. functional theory calculations support the proposed mechanistic cycle involving two low-valent cobalt species of different oxidation states to perform the reaction.

ACS Catalysis 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, Application of 4,4′-Dimethyldiphenyl.

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

Rousseau, Lidie published the artcileRelevance of Single-Transmetalated Resting States in Iron-Mediated Cross-Couplings: Unexpected Role of ¦Ò-Donating Additives, Name: 4,4′-Dimethyldiphenyl, the publication is Inorganic Chemistry (2021), 60(11), 7991-7997, database is CAplus and MEDLINE.

Control of the transmetalation degree of organoiron(II) species is a critical parameter in numerous Fe-catalyzed cross-couplings to ensure the success of the process. In this report, we however demonstrate that the selective formation of a monotransmetalated Fe^II species during the catalytic regime counterintuitively does not alone ensure an efficient suppression of the nucleophile homocoupling side reaction. It is conversely shown that a fine control of the transmetalation degree of the transient Fe^III intermediates obtained after the activation of alkyl electrophiles by a single-electron transfer (SET), achievable using ¦Ò-donating additives, accounts for the selectivity of the cross-coupling pathway. This report shows for the first time that both coordination spheres of Fe^II resting states and Fe^III short-lived intermediates must be efficiently tuned during the catalytic regime to ensure high coupling selectivities.

Inorganic 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 C14H14, Name: 4,4′-Dimethyldiphenyl.

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

Sharma, Deepika published the artcilePd-Au Supported Reduced Graphene Oxide Catalyst for Carbon- Hydrogen Bond Activation in Benzene, Safety of 4,4′-Dimethyldiphenyl, the publication is ChemistrySelect (2021), 6(28), 7111-7117, database is CAplus.

An improved reduced graphene oxide supported bimetallic palladium and gold catalyst was synthesized for the carbon-hydrogen bond activation of un-activated aromatic organic substrate benzene. XPS anal. has revealed that catalyst contained Au(0) nanoparticles with Pd(II) ions on its surface. The surface of rGO was found to be rich in sp² carbon content with >C=O groups that most probably provided supporting sites for the gold and palladium metals. The XRD anal. further confirmed that Au(0) nanoparticles with palladium oxide and palladium nanoparticles were present on rGO surface. The catalytic activity of the material was tested towards activation of benzene to form biphenyl as an end product. D. function theory has revealed that Pd(II) ion was the active component that insert itself in between C-H bond of benzene and showed efficiency to interact with oxygen mols. Simultaneously, Au(0) atoms have the tendency to adsorb on the ¦Ð-bonded surface of the catalyst and extend its conjugation that reduced the HOMO-LUMO gap of the catalyst and provided the good catalytic activity.

ChemistrySelect 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 C6H12Br2, Safety of 4,4′-Dimethyldiphenyl.

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