Month: December 2022

Li, Jiaqiang published the artcileEthers as hydrogen sources in BF₃¡¤OEt₂ promoted reduction of diphenylmethyl alcohols, ethers and esters to hydrocarbons, Quality Control of 457-68-1, the publication is RSC Advances (2015), 5(104), 85291-85295, database is CAplus.

A novel ether/BF₃ reductive system has been described, in which diphenylmethanols and their ether and ester derivatives are used as starting materials. Reductions are performed in ether under reflux and an argon atm., and the addition of extra water is beneficial to this reduction A series of alkanes are able to be prepared with good to excellent yields. A deuterated experiment exhibits that the reductive hydrogen is generated from ether. The mechanism is discussed in detail to explain the observed reactivity.

RSC Advances 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

Ji, Jing published the artcilePeroxide promoted tunable decarboxylative alkylation of cinnamic acids to form alkenes or ketones under metal-free conditions, Formula: C11H12O4, the publication is Chemical Communications (Cambridge, United Kingdom) (2015), 51(35), 7546-7549, database is CAplus and MEDLINE.

A tunable decarboxylative alkylation of cinnamic acids with alkanes was developed to form alkenes or ketones under transition metal-free conditions. In the presence of DTBP or DTBP/TBHP, the reaction gave alkenes and ketones resp. via a radical mechanism in moderate to good yields.

Chemical Communications (Cambridge, United Kingdom) published new progress about 16909-09-4. 16909-09-4 belongs to catalysis-chemistry, auxiliary class Alkenyl,Carboxylic acid,Benzene,Ether, name is (E)-3-(2,4-Dimethoxyphenyl)acrylic acid, and the molecular formula is C11H12O4, Formula: C11H12O4.

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

Fukui, Yuki published the artcileTunable Arylative Cyclization of 1,6-Enynes Triggered by Rhodium(III)-Catalyzed C-H Activation, Recommanded Product: O-Pivaloylhydroxylamine trifluoromethanesulfonate, the publication is Journal of the American Chemical Society (2014), 136(44), 15607-15614, database is CAplus and MEDLINE.

Two tunable arylative cyclizations of cyclohexadienone-containing 1,6-enynes, e.g., I, are reported via rhodium(III)-catalyzed C-H activation of O-substituted N-hydroxybenzamides. The use of different O substituents, i.e., O-Piv and O-Me, on the directing group allows the formation of either tetracyclic isoquinolones, e.g., II, through an N-Michael addition process or hydrobenzofurans, e.g., III, through a C-Michael addition process. Mechanistic investigations of these two cascade reactions clearly indicated that the C-H bond cleavage process was involved in the turnover-limiting step. Furthermore, the cyclization products could be subjected to various transformations for elaborating the pharmaceutically and synthetically valuable potential. This is the first example of a rhodium(III)-catalyzed arylative cyclization reaction of 1,6-enynes, and the results extend the application realm of Cp*Rh^III-catalyzed C-H activation cascade reactions.

Journal of the American Chemical Society published new progress about 1293990-73-4. 1293990-73-4 belongs to catalysis-chemistry, auxiliary class Aliphatic Chain, name is O-Pivaloylhydroxylamine trifluoromethanesulfonate, and the molecular formula is C6H12F3NO5S, Recommanded Product: O-Pivaloylhydroxylamine trifluoromethanesulfonate.

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

Wang, Xiaolu published the artcileCu(I) Coordination Polymers as the Green Heterogeneous Catalysts for Direct C-H Bonds Activation of Arylalkanes to Ketones in Water with Spatial Confinement Effect, Safety of Bis(4-fluorophenyl)methane, the publication is Inorganic Chemistry (2017), 56(21), 13329-13336, database is CAplus and MEDLINE.

To develop coordination polymers (CPs) as catalysts to selectively catalyze the reaction of C-H bond activation of arylalkanes to their homologous ketones, three new Cu(I)-based coordination polymers (Cu^I-CPs) [CuI(aas-TPB)]_n (1), [CuBr(ass-TPB)CH₃CN]_n (2), and {[Cu(ass-TPB)]Cl}_n (3) (TPB = N,N,N-tris(3-pyridinyl)-1,3,5-benzenetricarboxamide) were synthesized. Structural variations from a herringbone fashion 1-dimensional framework of 1 to a two-dimensional framework of 2 containing a 48-membered macrocycle and a cationic three-dimensional framework of 3 filled with Cl^– anions were observed arising from the different halogen ions (I^–, Br^–, and Cl^–). 1–3 Were used as the green heterogeneous catalysts to catalyze direct C-H bond activation reactions of arylalkanes to ketones under mild reaction conditions with H₂O as solvent. Handy product separation, convenient reaction procedures, and recyclability of these catalysts make the catalytic system fascinating. Also, the Cu^I-CPs performed the reaction with high regioselectivity due to the unique spatial confinement effect of CPs.

Inorganic Chemistry 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 C7H5Br2I, Safety of Bis(4-fluorophenyl)methane.

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

Zhang, Hanyun published the artcileSynthesis of diamides containing of 2-aryloxyacetyl and meta-trifluoromethylphenyl moieties and their herbicidal activity, Quality Control of 1798-04-5, the publication is Yingyong Huaxue (2016), 33(6), 668-676, database is CAplus.

Based on the combination of different active groups with different herbicidal modes of action, a series of diamide compounds containing 2-(aryloxy)acetyl and meta-trifluoromethylphenyl moieties were designed and synthesized via the four-component Ugi reaction. Their structures were characterized by IR, ¹H NMR, EI-MS, and elemental analyses. The glass house bioassay (in vivo) shows that some of compounds 3 exhibit moderate to good herbicidal activities against B. campestris, A. retroflexus, E. crusgalli, and D. sanguinalis at a dose of 1.5 kg/ha. For example, compound 3r displays 100% inhibition against both of A. retroflexus and D. sanguinalis in the pre-emergence treatment, it also exhibits 100% inhibition against D. sanguinalis in the post-emergence treatment. In addition, the preliminary structure-activity relationships are also discussed.

Yingyong Huaxue 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 C15H24S, Quality Control of 1798-04-5.

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

Su, Mingyue published the artcileSynthesis and fluorescence spectrum of Eu complex and Eu-L (L=La, Y, Yb and Nd) complex with 1,2-phenylenedioxydiacetic acid and dibenzoylmethane, Quality Control of 5411-14-3, the publication is Fenzi Kexue Xuebao (2012), 28(3), 227-231, database is CAplus.

A new ternary rare earth complex Eu-BDDA-DBM and the one with 1/2 Eu³⁺ ions and 1/2 L ions (L=La³⁺, Y³⁺, Yb³⁺, and Nd³⁺) were synthesized in the alc. solution using the reaction of rare earth chloride 1,2-phenylenedioxydiacetic acid and dibenzoylmethane as raw materials. The complexes were characterized by IR spectra, UV spectra, TG anal., fluorescence excitation, and emission spectra. The IR spectra indicate that the white complex has a similar coordination structure with the doped complex. The fluorescence spectra show that the fluorescence intensity of complexes of europium is increased after doped by La³⁺ and Nd³⁺, and among them the La³⁺ containing complex has the strongest fluorescence intensity.

Fenzi Kexue Xuebao published new progress about 5411-14-3. 5411-14-3 belongs to catalysis-chemistry, auxiliary class Carboxylic acid,Benzene,Ether, name is 2,2-(1,2-Phenylenebis(oxy))diacetic acid, and the molecular formula is C15H24O2, Quality Control of 5411-14-3.

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

Wang, Xing published the artcileFacile one-pot palladium-catalyzed sequential coupling to diarylmethanes by using aryl methyl ketones as the methylene donors, Category: catalysis-chemistry, the publication is European Journal of Organic Chemistry (2013), 2013(30), 6870-6877, database is CAplus.

A novel palladium-catalyzed coupling reaction of an aryl Me ketone with two mols. of an aryl halide to yield sym. diarylmethanes is described. In the facile one-pot reaction, the aryl Me ketone acts as a formal methylene donor. The exptl. facts, including TLC monitoring, speculated intermediates as the raw materials, anal. of the cesium benzoate coproduct by ex situ IR spectroscopy, and the cross-coupling reactions of two different aryl halides, indicate a mechanism involving a palladium-catalyzed sequential two-step coupling process, in which the presence of a trace amount of H₂O is indispensable. The reaction is applicable to a broad spectrum of substrates and delivers the products in good to excellent yields. Access to unsym. diarylmethanes with this method is also explored and various factors are discussed.

European Journal of Organic Chemistry 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 C6H10O7, Category: catalysis-chemistry.

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

Tai, Xi-Shi published the artcileSynthesis, spectral characterization, and electrochemical property of Cu(II) complex with 1,2-phenylenedioxydiacetic acid and 1,10-phenanthroline, Category: catalysis-chemistry, the publication is Research on Chemical Intermediates (2015), 41(11), 8279-8287, database is CAplus.

A novel dinuclear Cu(II) complex, [Cu₂L(phen)₄]¡¤L (1) [H₂L (2) = 1,2-phenylenedioxydiacetic acid], was obtained by the self-assembly of 1,2-phenylenedioxydiacetic acid, phen and Cu(CH₃COO)₂¡¤H₂O in CH₃OH/H₂O (v:v = 1:1) solution containing MgCl₂. The Cu(II) complex was characterized by elemental anal., IR, UV, and x-ray single-crystal diffraction anal. The crystal belongs to triclinic, space group P – 1 with a 13.090(3), b 14.211(3), c 19.255(4) ?, ¦Á 92.91(3), ¦Â 91.29(3), ¦Ã 110.01(3)¡ã, V = 3358.2(13) ?³, Z = 2, d_c = 1.282 g cm^-3, ¦Ì = 0.698 mm^-1, F (000) = 1332, and final R = 0.0744, ¦ØR = 0.2109. In the crystal structure, each Cu(II) atom is five-coordinated in a distorted square pyramid coordination environment. The mols. form one-dimensional chain structure by ¦Ð-¦Ð stack. The electrochem. properties of the Cu(II) complex were studied.

Research on Chemical Intermediates published new progress about 5411-14-3. 5411-14-3 belongs to catalysis-chemistry, auxiliary class Carboxylic acid,Benzene,Ether, name is 2,2-(1,2-Phenylenebis(oxy))diacetic acid, and the molecular formula is C14H26O2, Category: catalysis-chemistry.

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

Ramineni, Kishore published the artcileSynchronized C-H Activations at Proximate Dinuclear Pd²⁺ Sites on Silicotungstate for Oxidative C-C Coupling, Formula: C14H14, the publication is ACS Catalysis (2021), 11(6), 3455-3465, database is CAplus.

Carbon-carbon (C-C) coupling is critically important in organic synthesis. Direct C-C coupling to replace two C-H bonds is preferred over coupling of two prefunctionalized C-intermediates but is synthetically challenging. While such coupling is feasible through homogeneous catalysis, the mechanism regarding how the two C-H bonds are activated and coupled by heterogeneous active metal atoms remains not well understood. This work demonstrates the need for a proximate metal-metal dimer site to facilitate heterogeneously catalyzed C-C coupling reactions. We demonstrate that dinuclear Pd²⁺ sites in (Pd²⁺)₂-silicotungstate (Pd₂ST) catalyzed oxidative C-C coupling of 2-methylfuran by O₂ through synchronized double C-H activations under ambient conditions, selectively producing 5,5′-dimethyl-2,2′-bifuran (DMBF). Mononuclear Pd²⁺ ions in Pd₁H₂ST and H₄ST are not active. The ¹³C NMR and DRIFT spectroscopies of adsorbed ¹³CO, combined with DFT and theor. ¹³C NMR calculations, determined that dinuclear Pd²⁺ ions are separated by ~3.5 ? on Pd₂ST and 3.1 ? in the Pd²⁺-C(=O)-Pd²⁺ complex. XRD and TEM are used to confirm that the most active Pd₂ST/SiO₂ catalyst has near monolayer dispersion. ²⁹Si MAS NMR is used to confirm the presence of the silicotungstate structure after calcination. The original silicotungstate Keggin structure is maintained after the Pd₂ST/SiO₂ is calcined.

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, Formula: C14H14.

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

Cai, Mingli published the artcileMechanism of P-H insertion of ¦Á-imino copper carbenes: 1,1-Insertion or 1,3-insertion?, Recommanded Product: Dimesitylphosphine oxide, the publication is Chemical Physics Letters (2021), 139126, database is CAplus.

The reaction mechanisms of P-H insertion of ¦Á -imino copper carbenes with H-phosphine oxides were theor. investigated by the d. functional theory (DFT). The results revealed that 1,3-insertion was the most preferred pathway due to the strong proton capture ability of the Schiff base, which lowered the energy barrier of P-H insertion. In addition, the effects of substituents on the reactivity of H-phosphine oxides were investigated. For phosphinous acids, the intermol. p-p interaction and ¦Ð-¦Ð packing interaction of phosphine oxide exhibited pos. effects on the reactivity. For diphenylphosphinous acids, the electron-withdrawing substituent resulted in improving the reactivity of diphenylphosphinous acids.

Chemical Physics Letters 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, Recommanded Product: Dimesitylphosphine oxide.

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