Month: November 2022

Zhang, Kai published the artcileEfficient and Reversible Absorption of CO₂ by Functional Deep Eutectic Solvents, Formula: C6H20Cl2N4, the publication is Energy & Fuels (2018), 32(7), 7727-7733, database is CAplus.

Extremely low-volatility functional deep eutectic solvents (DESs), based on ethylene glycol (EG) and diethylene glycol (DG) as hydrogen-bond donor and the ammonium salts obtained from triethylenetetramine (TETA) and HCl at different mole ratios as hydrogen-bond acceptor, were designed and used to capture CO₂. All of the designed DESs can efficiently capture CO₂ even at low partial pressures. CO₂ absorption capacity of [TETA]Cl-EG DES with n_[TETA]Cl/n_EG 1:3 is high up to 17.5 wt % (1.456 mol CO₂/mol [TETA]Cl) at 40 ¡ãC and 1 atm. CO₂ absorption capacity decreases with increasing temperature and decreasing CO₂ partial pressure. Regeneration experiments show that CO₂ absorption capacities in [TETA]Cl-EG DES and [TETA]Cl-DG DES do not vary after five absorption/desorption cycles. It is found that EG or DG can increase the absorption capacity via activating -NH- or -NH₂ on [TETA]Cl and enhance the basicity of DESs. In addition, CO₂ absorption mechanism in [TETA]Cl-EG DES based on the change of its viscosity during absorption and FTIR anal. indicates that there is a chem. interaction between CO₂ and [TETA]Cl, and the stoichiometry for the reversible absorption is 1.5 mols. of CO₂ per [TETA]Cl-EG DES mol.

Energy & Fuels published new progress about 38260-01-4. 38260-01-4 belongs to catalysis-chemistry, auxiliary class Chelating Agents, name is N1,N1′-(Ethane-1,2-diyl)bis(ethane-1,2-diamine) dihydrochloride, and the molecular formula is C20H19NO4, Formula: C6H20Cl2N4.

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

Wang, Chong published the artcileBiomimetic donor-acceptor motifs in carbon nitrides: enhancing red-light photocatalytic selective oxidation by rational surface engineering, Product Details of C13H10F2, the publication is Applied Catalysis, B: Environmental (2021), 120259, database is CAplus.

Oxidation, especially selective oxidation by a heterogeneous catalyst with mol. oxygen, is a core technol. for the conversion of petrochem. feedstock to commodity chems. and pharmaceuticals. Existing catalytic approaches for efficient aerobic oxidation normally rely on the engagement of organometallic centers or transition-metal nanoparticles. In light of the necessity to develop sustainable production methodologies, multiple approaches for the metal-free polymeric carbon nitride (PCN) photocatalytic selective oxidation have been evaluated. However, the insufficient visible light optical absorption, poor charge-carriers separation and the weak driving force towards oxidation reaction impart a serious restriction on the efficiency and selectivity of the organic photosynthesis, especially under extended wavelength solar light irradiation Here, we report a surface engineering photochem. modification method to fabricate a donor-acceptor (D-A) functional carbon nitride photocatalyst (ECN) under ambient conditions. The well-developed D-A structure, preserved high crystallinity and enlarged ¦Ð-conjugation framework of the hybrid semiconductor-mol. ECN samples favor the improvement of the optical absorption, as well as the enhanced separation and migration of the photo-generated charge carriers. As a result, the obtained ECN photocatalysts exhibited remarkable enhancement in the photocatalytic aerobic oxidation of alcs., even under an extended light wavelength of 620 nm red-light irradiation The photocatalytic aerobic sulfides and sp³ C-H oxidation reactions were also considerably accelerated over ECN and may serve as a direct approach for the construction of value-added sulfoxide and ketone products.

Applied Catalysis, B: Environmental 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 C10H10O2, Product Details of C13H10F2.

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

Du, Xuxin published the artcileRhodium(III)-Catalyzed Alkynylation of 4-Arylphthalazin-1(2H)-one Scaffolds via C-H Bond Activation, Category: catalysis-chemistry, the publication is European Journal of Organic Chemistry (2020), 2020(9), 1100-1107, database is CAplus.

A rhodium(III)-catalyzed selective C-H bond mono-/bialkynation of 4-aryl phthalazin-1(2H)-ones I (R¹ = 4-Me, 4-F, 3,4-di-Me, etc.) was developed. The silver salt AgSbF₆ is demonstrated to play a vital role in promoting the bialkynation reactions. The present alkynation strategy is simple and efficient and features high functional group tolerance and broad substrate scope under an air atm. Addnl., 6-aryl pyridazin-3(2H)-one scaffolds II (R² = H, OMe, Cl, etc.) are amenable to the selective monoalkynation and sequential bialkynation, resp.

European Journal of Organic Chemistry 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 C10H10O3, Category: catalysis-chemistry.

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

Gao, Jin Sheng published the artcilecatena-Poly[[[tetraaquacobalt(II)]-¦Ì-4,4′-bipyridine-¦Ê²N:N’] 1,2-phenylenedioxydiacetate 4,4′-bipyridine hemisolvate dihydrate], HPLC of Formula: 5411-14-3, the publication is Acta Crystallographica, Section E: Structure Reports Online (2006), 62(11), m2913-m2915, database is CAplus.

In the title compound, {[Co(C₁₀H₈N₂)(H₂O)₄](C₁₀H₈O₆).0.5C₁₀H₈N₂.2H₂O}_n, the Co atoms are bridged into a chain by 4,4′-bipyridine units; both the bridging and the uncoordinated 4,4′-bipyridine mols. are arranged around inversion centers and are centrosym. Two-dimensional fishing-net layers are built up through O-H¡¤¡¤¡¤N H-bond interactions. The diacid anions and uncoordinated H₂O mols. fill the space between the layers. A 3-dimensional supramol. network is built up by O-H¡¤¡¤¡¤O and O-H¡¤¡¤¡¤N H-bond interactions between H₂O mols., anions and 4,4′-bipyridine mols. Crystal data: triclinic, space group P1?, a 9.7417, b 11.443(2), c 13.916(3) ?, ¦Á 73.19(3), ¦Â 80.46(3), ¦Ã 69.63(3)¡ã, Z = 2, d_c = 1.496, 5567 observed reflections with I > 2¦Ò(I), R[F² > 2¦Ò(F²)] = 0.031, wR(F²) = 0.081.

Acta Crystallographica, Section E: Structure Reports Online 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 C10H10O6, HPLC of Formula: 5411-14-3.

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

Du, Manfei published the artcileRegiospecific amino bromine addition of ¦Â-nitrostyrene derivatives with acrylamide and N-bromobutanimide, Related Products of catalysis-chemistry, the publication is Gaodeng Xuexiao Huaxue Xuebao (2016), 37(5), 902-911, database is CAplus.

A new protocol for the high regioselective aminobromination of ¦Â-nitrostyrene derivatives with acrylamide and N-Bromobutanimide (NBS) as nitrogen/bromine sources was developed. ¦Â-Nitrostyrene derivatives reacted with acrylamide and NBS promoted by CH₃CH₂ONa at room temperature (without the protection of an inert gaseous atm.) in CH₂Cl₂, offered vicinal haloamine products in good yields (up to 83%). For the ¦Â-methyl-¦Â-nitrostyrene, the good yields (up to 98%) were also achieved in CH₃OH promoted by Na₂CO₃. Although the strong electron-donating substituents (e.g., OCH₃) on the 4-position of benzene ring could deactivated the reaction activity of ¦Â-nitrostyrene derivatives, the vicinal haloamines were also afforded as the sole addition product. Whereas strong electron-withdrawing substituents (e.g., NO₂) could activated reaction activity remarkably and the vicinal haloamines were afforded as the sole addition product, too. The result revealed that the addition reaction had a nucleophilic addition feature. The aminobromination of 25 examples of ¦Â-nitrostyrenes were investigated and the structure of all products were confirmed by the corresponding NMR (NMR) spectra and high resolution mass spectrometer (HRMS). A possible mechanism involving a nucleophilic conjugate addition was proposed.

Gaodeng Xuexiao Huaxue Xuebao published new progress about 4230-93-7. 4230-93-7 belongs to catalysis-chemistry, auxiliary class Alkenyl,Nitro Compound,Benzene,Ether, name is 1,2-Dimethoxy-4-(2-nitrovinyl)benzene, and the molecular formula is C10H11NO4, Related Products of catalysis-chemistry.

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

Chen, Chaohuang published the artcilePalladium(II)-Catalyzed Aminotrifluoromethoxylation of Alkenes: Mechanistic Insight into the Effect of N-Protecting Groups, Application of 2,2-Diallylpent-4-en-1-amine, the publication is Chinese Journal of Chemistry (2020), 38(4), 346-350, database is CAplus.

An efficient palladium-catalyzed regioselective 5-exo aminotrifluoromethoxylation of alkenes was established herein, which provided a practical route toward the synthesis of OCF₃-containing pyrrolidines such as I [R¹ = H, allyl, 4-ClC₆H₄, etc.; R² = allyl, Bn, 4-FC₆H₄, etc.; R¹R² = (CH₂)₃, (CH₂)₄, (CH₂)₂O(CH₂)₂, etc.] and II. Tert-Butyloxycarbonyl (Boc) as an amino protecting group played a significant role in both chemo- and regioselectivities. In addition, preliminary mechanistic studies revealed that amino protecting group of substrates and counter anion of palladium catalyst play critical roles in reaction efficiency presumably due to an isomerization of alkyl- Pd(II) intermediates. Moreover, the asym. 5-exo aminotrifluoromethoxylation reaction had also been achieved by introducing a sterically bulky pyridinyl-oxazoline ligand.

Chinese Journal of Chemistry published new progress about 928836-00-4. 928836-00-4 belongs to catalysis-chemistry, auxiliary class Alkenyl,Amine,Aliphatic hydrocarbon chain, name is 2,2-Diallylpent-4-en-1-amine, and the molecular formula is C11H19N, Application of 2,2-Diallylpent-4-en-1-amine.

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

Nishiyama, Yoshitake published the artcileSynthesis of benzyl sulfides via substitution reaction at the sulfur of phosphinic acid thioesters, COA of Formula: C18H23OP, the publication is Chemical Communications (Cambridge, United Kingdom) (2020), 56(43), 5771-5774, database is CAplus and MEDLINE.

An ambident electrophilicity of phosphinic acid thioesters RSP(O)(R¹)₂ (R = Me, pent-4-en-1-yl, naphthalen-2-yl, thiophen-3-yl, etc.; R¹ = n-Bu, cyclohexyl, 2-methylphenyl, etc.) is disclosed. Unexpected carbon-sulfur bond formation took place in the reaction between phosphinic acid thioesters and Grignard reagents R²MgCl (R² = Bn, 1-phenylethyl, naphthalen-1-ylmethyl, etc.). The developed method for benzyl sulfides RSR² has a wide substrate scope and was applicable for the synthesis of a drug analog.

Chemical Communications (Cambridge, United Kingdom) 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, COA of Formula: C18H23OP.

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

Kira, Mitsuo published the artcileA new mode of fluoride-ion exchange reactions between tetracoordinate silane and pentacoordinate fluorosilicate, SDS of cas: 312-40-3, the publication is Chemistry Letters (1995), 807-8, database is CAplus.

Intramol. fluoride-ion donor-acceptor systems such as [p- and m-(difluorophenylsilyl)phenyl]trifluorophenylsilicates showed a new mode of fluoride-ion exchange reactions in solution, for which a concerted bimol. exchange mechanism through cyclophane-like transition states was proposed on the basis of a dynamic ¹³C NMR anal. of rates and activation parameters.

Chemistry Letters 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, SDS of cas: 312-40-3.

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

Morin, Frederick G. published the artcileCarbon-13 magnetic resonance of hydroaromatics. II. Conformation of Tetralin and tetrahydroanthracene and their methyl derivatives, Related Products of catalysis-chemistry, the publication is Journal of the American Chemical Society (1983), 105(12), 3992-8, database is CAplus.

¹³C NMR chem. shifts are determined for 36 methylated tetralins and tetrahydroanthracenes. A least-squares regression anal. of the ring C atoms in compounds of unequivocal conformation is used to estimate Me substituent parameters for the 2 distinct aliphatic positions, and the results are used to estimate the position of equilibrium of conformationally mobile compounds 1-Methyltetralin exists in essentially equally populated conformers at room temperature; the 2-Me derivative is dominated by the conformation with an equatorial Me group. Substituent parameters are compared with those previously determined for methylated cyclohexanes. A similar anal. of the Me chem. shifts was unsuccessful due, in part, to the highly flexible nature of the saturated ring.

Journal of the American Chemical Society published new progress about 1949-41-3. 1949-41-3 belongs to catalysis-chemistry, auxiliary class Carboxylic acid,Benzene, name is 2-Methyl-4-phenylbutanoic acid, and the molecular formula is C11H14O2, Related Products of catalysis-chemistry.

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

Destro, Gianluca published the artcileTransition-Metal-Free Carbon Isotope Exchange of Phenyl Acetic Acids, Safety of 4-Nitrophenylacetic acid, the publication is Angewandte Chemie, International Edition (2020), 59(32), 13490-13495, database is CAplus and MEDLINE.

A transition-metal-free carbon isotope exchange procedure on Ph acetic acids is described. Utilizing the universal precursor CO₂, this protocol allows the carbon isotope to be inserted into the carboxylic acid position, with no need of precursor synthesis. This procedure enabled the labeling of 15 pharmaceuticals and was compatible with carbon isotopes [¹⁴C] and [¹³C]. A proof of concept with [¹¹C] was also obtained with low molar activity valuable for distribution studies.

Angewandte Chemie, International Edition published new progress about 104-03-0. 104-03-0 belongs to catalysis-chemistry, auxiliary class Nitro Compound,Carboxylic acid,Benzene, name is 4-Nitrophenylacetic acid, and the molecular formula is C8H7NO4, Safety of 4-Nitrophenylacetic acid.

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