Catalysis-chemistry

Sherwood, Trevor C. published the artcileDecarboxylative Intramolecular Arene Alkylation Using N-(Acyloxy)phthalimides, an Organic Photocatalyst, and Visible Light, COA of Formula: C10H10O3, the publication is Journal of Organic Chemistry (2019), 84(13), 8360-8379, database is CAplus and MEDLINE.

An intramol. arene alkylation reaction was developed using the organic photocatalyst 4CzIPN, visible light, and N-(acyloxy)phthalimides as radical precursors. Reaction conditions were optimized via high-throughput experimentation, and electron-rich and electron-deficient arenes and heteroarenes are viable reaction substrates. This reaction enables access to a diverse set of fused, partially saturated cores which are of high interest in synthetic and medicinal chem.

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 C12H17NS2, COA of Formula: C10H10O3.

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

Dong, Qizhi published the artcileLigand-free Cu₂O nanowire catalyzing C-N and C-O coupling reaction, Application In Synthesis of 1821-27-8, the publication is Youji Huaxue (2014), 34(1), 147-154, database is CAplus.

A novel nano-material with Cu₂O nanowires loaded on TiO₂ nanotubes (Cu₂O/TiO₂ NTs) was prepared in this paper. The new type of catalyst was used to catalyze the C-N and C-O coupling of chlorinated aromatics The results showed that this catalyst promised the reaction of not only aryl bromide, but also aryl chloride, and most products, e.g., I, were synthesized in good to excellent yields. Moreover, the reused experiments confirmed that the catalyst can be recycled five times and present stable yields for reaction.

Youji Huaxue published new progress about 1821-27-8. 1821-27-8 belongs to catalysis-chemistry, auxiliary class Nitro Compound,Amine,Benzene, name is Bis(4-nitrophenyl)amine, and the molecular formula is C12H9N3O4, Application In Synthesis of 1821-27-8.

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

Du, Jialei published the artcileA recyclable self-supported nanoporous PdCu heterogeneous catalyst for aqueous Suzuki-Miyaura cross-coupling, Synthetic Route of 613-33-2, the publication is Chemical Communications (Cambridge, United Kingdom) (2021), 57(88), 11641-11644, database is CAplus and MEDLINE.

Nanoporous PdCu (NP-PdCu) was prepared by the dealloying strategy from a PdCuAl ternary alloy precursor and characterized systematically using SEM, TEM, XRD, and XPS. NP-PdCu was demonstrated to be a competent self-supported heterogeneous catalyst for Suzuki-Miyaura cross-coupling, affording a series of synthetically valuable biaryl compounds in good to excellent yields. This catalyst could be easily separated from the product via centrifugation and reused several times without obvious loss of catalytic performance.

Chemical Communications (Cambridge, United Kingdom) 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

Tang, Kaluo published the artcileReactions of mononuclear copper complexes formed by insertion of CS₂ into Cu-S bonds with various solvents. III. Formation and crystal structure of [CuI(PPh₃)(Py)]₂ and [CH₂(C₅H₅N)₂]₂[Cu₂I₆], Synthetic Route of 22693-41-0, the publication is Beijing Daxue Xuebao, Ziran Kexueban (1995), 31(6), 695-702, database is CAplus.

Mononuclear Cu complexes with structures of (Ph₃P)₂Cu(S₂CSR), formed by insertion of CS₂ into Cu-S bonds, can react with a various solvents undergoing some nucleophilic reactions. [CuI(PPh₃)(Py)]₂ (I) and [CH₂(C₅H₅N)₂]₂[Cu₂I₆] (II) were obtained from the reaction of starting material (R = Bu^t, C₆H₂Pr₃ⁱ-2,4,6) with CH₂I₂-acetone mixed-solvent in the presence of pyridine and then self-assembly in the same solution Crystal data for I: space group C₂/c,a = 26.112(6), b 14.499(3), c 11.357(2) ?, ¦Â 95.12(2)¡ã, Dc = 1.650 g/cm¡Þ3, Z = 4, R = 0.0334 fro 2182 independent reflections. Crystal data for II: space group P2₁/n, a 11.389(4), b 11.698(5), c 13.227(7) ?, ¦Â 114.99(4)¡ã, Dc = 2.563 g/cm³, Z = 0.0627 for 1891 independent reflection.

Beijing Daxue Xuebao, Ziran Kexueban published new progress about 22693-41-0. 22693-41-0 belongs to catalysis-chemistry, auxiliary class Other Functionalization Reagent, name is 2,4,6-Triisopropylbenzenethiol, and the molecular formula is C5H6BNO2, Synthetic Route of 22693-41-0.

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

Qu, Le-tian published the artcileEffects of salinity treatment on muscle quality and off-flavour compounds of grass carp (Ctenopharyngodon idella) and black carp (Mylopharyngodon piceus), Name: Docosahexaenoic Acid, the publication is Aquaculture Research (2022), 53(13), 4823-4831, database is CAplus.

To investigate the effects of short-term salinity treatment on muscle quality and earthy and musty off-flavor compounds of freshwater fish, adult grass carp (1.25 ¡À 0.25 kg) and black carp (1.50 ¡À 0.30 kg) were reared at water salinities of 0%, 5% and 7.5%for 48 h. Muscle nutrients, amino acid, and fatty acid contents, texture properties, and earthy and musty off-flavor compounds were then determined The content of total amino acid (TAA), Lys, Arg and essential amino acid index (EAAI) in the muscle of C7.5 group were elevated significantly compared with that in the control group (p < 0.05). The content of delicious amino acids (DAA) and EAAI in the muscle of M7.5 group was significantly higher than M0 and M5 groups (p < 0.05). The fatty acid content of the muscle was affected by salinity. In grass carp, the saturated fatty acid (SFA) content level was decreased significantly in the C5 and C7.5 groups (p < 0.05), while the monounsaturated fatty acid (MUFA) and polyunsaturated fatty acid (PUFA) content levels were increased significantly in the C5 and C7.5 groups (p < 0.05). The ratio of n3/n6 PUFA increased significantly in the C7.5 group (p < 0.05). The PUFA content and the n3/n6 PUFA ratio were increased significantly in the M7.5 group (p < 0.05). With increasing salinity, the relative content levels of volatile compounds causing earthy and musty off-flavor in muscle were decreased significantly in 5% and 7.5% salinity groups both grass carp and black carp (p < 0.05). The textural properties of muscle, such as hardness, springiness, gumminess and chewiness, were improved in the C7.5 and M5 groups. These results suggest that a short-term salinity treatment in freshwater fish prior to selling can effectively improve muscle quality and decrease the content of earthy and musty off-flavor compounds, with ideal salinities of 5% or 7.5% for grass carp and 7.5% for black carp.

Aquaculture Research published new progress about 6217-54-5. 6217-54-5 belongs to catalysis-chemistry, auxiliary class Alkenyl,Carboxylic acid,Aliphatic hydrocarbon chain,Metabolic Enzyme,RAR/RXR,Natural product, name is Docosahexaenoic Acid, and the molecular formula is C22H32O2, Name: Docosahexaenoic Acid.

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

Cheng, Guilin published the artcileChemoenzymatic dynamic kinetic resolution of ¦Á-trifluoromethylated amines: influence of substitutions on the reversed stereoselectivity, Product Details of C3H6F3N, the publication is RSC Advances (2013), 3(25), 9820-9828, database is CAplus.

Enzymic resolution of ¦Á-trifluoromethylated amines via kinetic resolution (KR), dynamic kinetic resolution (DKR) employing Candida antarctica lipase B (CALB)-Pd/Al₂O₃, and a one-pot sequential process of KR/DKR/KR was investigated comparatively for the first time. Although CALB-catalyzed KR of ¦Á-trifluoromethylated amines with substituents of Me (1a), iso-Pr (1c), Ph (1d) and benzyl group (1e) can provide good stereoselectivity factors E from 31 to >200, resp., DKR and sequential process of KR/DKR/KR possess better practical application potential because of the higher conversion (62%-84%) and the similar enantiomeric excesses (90%-99%). The enantio-preference and inversion for the ¦Á-trifluoromethylated amines displayed by CALB were observed and explained by docking modes. Namely, for 1,1,1-trifluoro-2-propylamine (1a), the product amide with R-configuration was obtained, and the enantio-preference was converted to S for the amines (1b-1e) with substituents larger than Me group. The catalysts recycle, and scale-up experiments were demonstrated successfully. All these results indicated the high efficiency and green feature of this enzymic process, and its application significance.

RSC Advances published new progress about 421-49-8. 421-49-8 belongs to catalysis-chemistry, auxiliary class Trifluoromethyl,Fluoride,Amine,Aliphatic hydrocarbon chain, name is 1,1,1-Trifluoropropan-2-amine, and the molecular formula is C3H6F3N, Product Details of C3H6F3N.

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

Wu, Ying published the artcileAxinellasins A-D, immunosuppressive cycloheptapeptide diastereomers, discovered via a precursor ion scanning-supercritical fluid chromatography strategy from the marine sponge Axinella species, SDS of cas: 71989-31-6, the publication is Organic Letters (2022), 24(3), 934-938, database is CAplus and MEDLINE.

The precursor ion scanning-supercritical fluid chromatog. (PI-SFC) method was applied to explore new methionine sulfoxide-containing cycloheptapeptides, axinellasins A-D (1-4), from the marine sponge Axinella sp. Their structures, including absolute configurations, were elucidated by detailed spectroscopic analyses and X-ray crystallog. The total synthesis of axinellasin D was completed via an Fmoc (Fmoc = 9-fluorenylmethoxycarbonyl) solid/solution-phase synthesis. Axinellasins A-D exhibited immunosuppressive effects via inhibition of T and B cell proliferation, and Axinellasin A and D showed better inhibitory activities than their corresponding diastereomers.

Organic Letters published new progress about 71989-31-6. 71989-31-6 belongs to catalysis-chemistry, auxiliary class Amino acide derivatives,pyrrolidine, name is Fmoc-Pro-OH, and the molecular formula is C17H18N2O6, SDS of cas: 71989-31-6.

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

Shen, Shi-Ke published the artcileMonitoring the lipid oxidation and flavor of Russian sturgeon fillets treated with low temperature vacuum heating: formation and relationship, Formula: C22H32O2, the publication is Journal of the Science of Food and Agriculture (2022), 102(11), 4609-4619, database is CAplus and MEDLINE.

Sturgeon is one of the most precious fish resources worldwide. Low temperature vacuum heating (LTVH) has been confirmed as a good way of maintaining food quality. However, there is a lack of in-depth studies assessing the impact of LTVH on lipid oxidation and flavor formation. The present study compared the effect of LTVH and traditional cooking on lipid oxidation and flavor of sturgeon fillets. In total, 13 fatty acids were detected, of which polyunsaturated fatty acids content was the highest (P < 0.05). LTVH prevented the formation of conjugated diene and thiobarbituric acid reactive substances (P < 0.05), as manifested by an increased signal intensity of free radicals of ESR. The characteristic peaks intensity of lipid by Raman at 970 cm-1, 1080 cm-1 and 1655 cm-1 were reduced, whereas peaks at 1068 cm-1 and 1125 cm-1 displayed the opposite trend. Confocal fluorescence microscopy showed that the lipids particles were reduced and distributed more evenly with an increase in heating temperature Principal component anal. of electronic nose cannot effectively sep. all groups; however, gas chromatog.-ion migration spectrometry showed that the volatile flavor compounds were relatively stable during LTVH. Correlation anal. of all the above lipid oxidation indexes and characteristic flavor substances showed that each treatment group was located in different quadrants and demonstrated great differentiation. Overall, the results of the present study support the view that LTVH is a healthier way of cooking.

Journal of the Science of Food and Agriculture published new progress about 6217-54-5. 6217-54-5 belongs to catalysis-chemistry, auxiliary class Alkenyl,Carboxylic acid,Aliphatic hydrocarbon chain,Metabolic Enzyme,RAR/RXR,Natural product, name is Docosahexaenoic Acid, and the molecular formula is C3H6F3N, Formula: C22H32O2.

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

Liu, Xianhu published the artcileQuantum-size-effect accommodation of gold clusters with altered fluorescence of dyes, Application of 5,9-Diaminobenzo[a]phenoxazin-7-ium acetate, the publication is RSC Advances (2015), 5(39), 30610-30616, database is CAplus.

We have synthesized monodispersed Au₂₅ nanoclusters (NCs) stabilized with eco-friendly glutathione and report here an insight into their interactions with dye mols. In the presence of such gold NCs, consistent fluorescence quenching was observed for all the dye mols. that we examined in this study regardless of their maximum emission wavelengths. The steady-state and time-resolved spectroscopic results demonstrate that the weakened luminance is associated with the protective ligand pertaining to a static quenching mechanism. Having expounded this issue, we further employed proper laser irradiation enabling dissociation of Au₂₅(SG)₁₈ so as to attain a transformation of nonplasmonic NCs into plasmonic gold nanoparticles (NPs) via photo-assisted aggregation of the dissociated gold clusters. As a result, emission enhancement for these dyes was observed, which is largely attributed to the local electromagnetic field enhancement of gold NPs. The alternation of fluorescence quenching to emission enhancement reflects an accommodation of quantum size effects upon the ligand-stabilized gold clusters.

RSC Advances published new progress about 10510-54-0. 10510-54-0 belongs to catalysis-chemistry, auxiliary class Other Aromatic Heterocyclic,Salt,Amine,Inhibitor,Inhibitor, name is 5,9-Diaminobenzo[a]phenoxazin-7-ium acetate, and the molecular formula is C18H15N3O3, Application of 5,9-Diaminobenzo[a]phenoxazin-7-ium acetate.

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

Li, Wen-Duo published the artcileBoryl Radical Activation of Benzylic C-OH Bond: Cross-Electrophile Coupling of Free Alcohols and CO₂ via Photoredox Catalysis, Product Details of C14H14, the publication is Journal of the American Chemical Society (2022), 144(19), 8551-8559, database is CAplus and MEDLINE.

A new strategy for the direct cleavage of the C(sp³)-OH bond was developed via activation of free alcs. with neutral di-Ph boryl radical generated from sodium tetraphenylborate under mild visible light photoredox conditions. This strategy was verified by cross-electrophile coupling of free alcs. and carbon dioxide for the synthesis of carboxylic acids. Direct transformation of a range of primary, secondary, and tertiary benzyl alcs. to acids was achieved. Control experiments and computational studies indicate that activation of alcs. with neutral boryl radical undergoes homolysis of the C(sp³)-OH bond, generating alkyl radicals. After reducing the alkyl radical into carbon anion under photoredox conditions, the following carboxylation with CO₂ affords the coupling product.

Journal of the American Chemical Society 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, Product Details of C14H14.

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