Catalysis-chemistry

Zhao, Liqiang published the artcileUse of organic ester as a high-performance spacer for the acidic preflush and hydraulic fracturing system, COA of Formula: C14H31NO2, the publication is Tianranqi Gongye (2012), 32(6), 43-45, database is CAplus.

The acidic preflush and hydraulic fracturing treatment has been widely applied to the stimulation of reservoirs at oil and gas fields. Although satisfactory stimulation effects have been obtained, the problem of gel breaking arises before the interactive touch between the prepad fluid and the fracturing fluid in the process of injection. In view of this, for the purpose of smooth operation and successful EOR treatment, the spacer is adopted to isolate the prepad fluid from the fracturing fluid. Through theor. anal. and exptl. research, the organic ester is used as the main agent to improve the performance of the prepad fluid and spacer for the developed acidic preflush and hydraulic fracturing system, and their formula and preparation methods are also presented herein. After a series of exptl. evaluation and anal., this developed acidic preflush and hydraulic fracturing system can not only meet the need of the technol., but effectively isolate the prepad fluid from the fracturing fluid, which helps improve the performance of the fracturing treatment.

Tianranqi Gongye published new progress about 2016-56-0. 2016-56-0 belongs to catalysis-chemistry, auxiliary class Active Esterification, name is Dodecylamineacetate, and the molecular formula is C10H15NO, COA of Formula: C14H31NO2.

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

Zhang, Yun published the artcileCopper-catalyzed decarboxylative trifluoroethylation of cinnamic acids, Computed Properties of 1772-76-5, the publication is Tetrahedron Letters (2017), 58(9), 880-883, database is CAplus.

An efficient Cu-catalyzed stereoselective trifluoroethylation through the decarboxylative cross-coupling of cinnamic acid derivatives with CF₃CH₂I is described. The ready availability of the starting materials, the high level of functional group tolerance, and excellent E selectivity make this protocol a safe and operationally convenient strategy for the efficient synthesis of trifluoroethyl derivatives

Tetrahedron Letters published new progress about 1772-76-5. 1772-76-5 belongs to catalysis-chemistry, auxiliary class Benzenes, name is (E)-3-(3-Nitrophenyl)acrylic acid, and the molecular formula is C11H16BNO3, Computed Properties of 1772-76-5.

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

Yang, Wen published the artcileChiral squaramide-catalyzed highly diastereo- and enantioselective direct Michael addition of nitroalkanes to nitroalkenes, Safety of 1,2-Dimethoxy-4-(2-nitrovinyl)benzene, the publication is Chemical Communications (Cambridge, United Kingdom) (2011), 47(47), 12706-12708, database is CAplus and MEDLINE.

An efficient highly diastereo- and enantioselective direct Michael addition of nitroalkanes to nitroalkenes catalyzed by chiral squaramide catalyst has been developed. This organocatalytic reaction with a low catalyst loading (2 mol%) proceeded well to afford synthetically useful 1,3-dinitro compounds in high yields with high diastereoselectivities (up to 95:5 dr) and excellent enantioselectivities (up to 97% ee).

Chemical Communications (Cambridge, United Kingdom) 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 C3H6BrNaO3S, Safety of 1,2-Dimethoxy-4-(2-nitrovinyl)benzene.

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

Yang, Wen published the artcileChiral Squaramide-Catalyzed Highly Enantioselective Michael Addition of 2-Hydroxy-1,4-naphthoquinones to Nitroalkenes, Product Details of C10H11NO4, the publication is Advanced Synthesis & Catalysis (2011), 353(8), 1241-1246, database is CAplus.

A chiral squaramide-organocatalyzed, highly enantioselective Michael addition of 2-hydroxy-1,4-naphthoquinones to nitroalkenes has been developed. This reaction afforded the chiral naphthoquinones in excellent yields (up to 99%) and excellent enantioselectivity (up to 98% ee) under very low catalyst loading (0.25 mol%). This organocatalytic asym. Michael addition provides an efficient alternative route toward the synthesis of chiral functionalized naphthoquinones.

Advanced Synthesis & Catalysis 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 C18H17NO8, Product Details of C10H11NO4.

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

Liang, Jingwen published the artcileA series of organotin(IV) complexes based on (E)-3-(3-nitrophenyl) acrylic acid: Syntheses, crystal structures and biological activities, Formula: C9H7NO4, the publication is Inorganic Chemistry Communications (2014), 133-137, database is CAplus.

A series of organotin carboxylates based on (E)-3-(3-nitrophenyl) acrylic acid (HL), namely {[Ph₃SnL]¡¤0.5C₆H₆}_n (1), [(Ph₃Sn)₂O(L)(Ph₃Sn)(L)]_n (2) and [Bu₂LSnOSnLBu₂]₂ (3), have been synthesized. All the complexes have been characterized by elemental anal., IR, ¹H NMR spectroscopy and x-ray diffraction analyses. The structural analyses show that complexes 1–2 adopt 1D polymeric chain structures generated by the bridging carboxylate ligands and the five-coordinated tin centers. The structure of complex 3 is centro-sym. and features a central rhombus Sn₂O₂ unit with two addnl. tin atoms linked at the O atoms. In addition, the antitumor activity of complex 3 has been studied.

Inorganic Chemistry Communications published new progress about 1772-76-5. 1772-76-5 belongs to catalysis-chemistry, auxiliary class Benzenes, name is (E)-3-(3-Nitrophenyl)acrylic acid, and the molecular formula is C9H7NO4, Formula: C9H7NO4.

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

Dreyer, R. published the artcileSynthesis and characterization of cationic astatine compounds with sulfur-containing ligands stable in aqueous solutions, Synthetic Route of 6972-05-0, the publication is Journal of Radioanalytical and Nuclear Chemistry (1985), 96(3), 333-41, database is CAplus.

The formation of cationic At compounds with thiourea, thiourea derivatives and some N-acylthioureas was studied in aqueous solutions The ion mobilities in free electrolytes were determined for the detection of carrier-free At compounds and their characterization. Information about the stability of this group of compounds could be given after studies in the presence of halide and pseudohalide ions (Cl^–, Br^–, I^–, SCN^–).

Journal of Radioanalytical and Nuclear 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, Synthetic Route of 6972-05-0.

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

Ekner, Holly published the artcileDetermination of polycyclic aromatic hydrocarbons in commercial olive oils by HPLC/GC/MS – Occurrence, composition and sources, Synthetic Route of 191-07-1, the publication is Food Control (2022), 108528, database is CAplus.

Polycyclic aromatic hydrocarbons (PAHs) are a large class of organic compounds produced from incomplete combustion. Many PAHs are mutagenic and some are carcinogenic and pose a health risk to humans. Dietary intake of PAHs is a major route of exposure, where fats and edible oils are important contributors to overall dietary PAH exposure. Composed of hundreds of individual compounds as a complex mixture, only 16 PAHs are typically monitored in food and the environment. In this present study we analyzed 16 com. olive oil samples from different countries of origin and type (virgin or refined oil) for their content of 45 PAHs using a high-performance liquid chromatograph coupled to a gas chromatograph with a mass spectrometric detector. The content of the 45 PAHs varied between 9.17 and 94.7¦Ìg/kg (median: 30.1¦Ìg/kg) in the different olive oil samples. Only one sample didn’t meet the regulatory threshold levels for PAHs. The compositional profile of PAHs across the olive oil samples showed a high abundance of PAHs of lower mol. weights, and a large contribution of alkylated PAHs regardless of olive oil type. Direct contact with diesel exhaust emissions from mech. harvesters has previously shown to affect PAH levels in olive oils. Using diagnostic PAH ratios, biomass/coal combustion and/or petroleum/fossil fuel combustion were indicated as important sources. Source apportionment by Pos. Matrix Factorization revealed diesel exhaust emission and biomass combustion as the two major sources of PAHs followed by traffic emissions. This suggests that air quality may have a considerable impact on pollution levels in olive oils and thus indirectly affect dietary exposure.

Food Control 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, Synthetic Route of 191-07-1.

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

Netzeva, Tatiana published the artcile2D and 3D QSAR analysis of some valproic acid metabolites and analogues as anticonvulsant agents, Synthetic Route of 3115-28-4, the publication is Pharmaceutical Research (2000), 17(6), 727-732, database is CAplus and MEDLINE.

Purpose: To investigate the structural features responsible for the variations in anticonvulsant activity of a series of twenty six valproic acid (VPA) metabolites and analogs. Methods: Different approaches for quant. structure-activity relationship anal. (QSAR) as conventional 2D QSAR anal. and comparative mol. field anal. (3D QSAR) were used. The 2D QSAR was performed with more than twenty structure descriptors as the partition and distribution coefficients, topol., geometrical and electronic descriptors, and indicator variables. The electronic descriptors were calculated for the energetically most stable conformers. For the need of 3D QSAR steric and electrostatic potential maps were generated. Partial least squares (PLS) anal. has been carried out for the statistical evaluation of the models and weighted least squares (WLS) anal. was used for the visualization of the results. Results: It was established that the two approaches-2D and 3D QSAR, prove the importance of the lipophilicity of the compounds for anticonvulsant activity. The results from both the approaches suggest that a substitution at ¦Á-position is essential for a higher activity. Conclusions: 3D QSAR is useful for describing the steric and electrostatic fields, important for the activity. For predicting the activity of new compounds 2D QSAR tools were proposed.

Pharmaceutical Research published new progress about 3115-28-4. 3115-28-4 belongs to catalysis-chemistry, auxiliary class Aliphatic Chain, name is 2-Butylhexanoic acid, and the molecular formula is C10H20O2, Synthetic Route of 3115-28-4.

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

Goldberg, Frederick W. published the artcileOptimization of Brain Penetrant 11¦Â-Hydroxysteroid Dehydrogenase Type I Inhibitors and in Vivo Testing in Diet-Induced Obese Mice, Formula: C3H8N2S, the publication is Journal of Medicinal Chemistry (2014), 57(3), 970-986, database is CAplus and MEDLINE.

11¦Â-Hydroxysteroid dehydrogenase type 1 (11¦Â-HSD1) has been widely considered by the pharmaceutical industry as a target to treat metabolic syndrome in type II diabetics. We hypothesized that central nervous system (CNS) penetration might be required to see efficacy. Starting from a previously reported pyrimidine compound, we removed hydrogen-bond donors to yield I, which had modest CNS penetration. More significant progress was achieved by changing the core to give II, which combines good potency and CNS penetration. Compound II was dosed to diet-induced obese (DIO) mice and gave excellent target engagement in the liver and high free exposures of drug, both peripherally and in the CNS. However, no body weight reduction or effects on glucose or insulin were observed in this model. Similar data were obtained with a structurally diverse thiazole compound III. This work casts doubt on the hypothesis that localized tissue modulation of 11¦Â-HSD1 activity alleviates metabolic syndrome.

Journal of Medicinal 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, Formula: C3H8N2S.

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

Bellini, Clement published the artcileAlkaline-Earth-Catalyzed Cross-Dehydrocoupling of Amines and Hydrosilanes: Reactivity Trends, Scope and Mechanism, COA of Formula: C16H20N2, the publication is Chemistry – A European Journal (2016), 22(13), 4564-4583, database is CAplus and MEDLINE.

Alk.-earth (Ae = Ca, Sr, Ba) complexes catalyze the chemoselective cross-dehydrocoupling (CDC) of amines and hydrosilanes. Key trends were delineated in the benchmark couplings of Ph₃SiH with pyrrolidine or tBuNH₂. Ae{E(SiMe₃)₂}₂¡¤(THF)_x (E = N, CH; x = 2-3) are more efficient than [N?]Ae[E(SiMe₃)₂]¡¤(THF)_n (E = N, CH; n = 1-2) complexes ([N?]^– = [ArN(o-C₆H₄)C(H):NAr]^– with Ar = 2,6-iPr₂C₆H₃) bearing an iminoanilide ligand, and alkyl pre-catalysts are better than amido analogs. Turnover frequencies (TOFs) increase in the order Ca<Sr<Ba. Ba[CH(SiMe₃)₂]₂¡¤(THF)₃ displays the best performance (TOF up to 3600 h^-1). The substrate scope (>30 products) includes diamines and di(hydrosilane)s. Kinetic anal. of the Ba-promoted CDC of pyrrolidine and Ph₃SiH shows that 1: the kinetic law is rate = k[Ba]¹[amine]⁰[hydrosilane]¹, 2: electron-withdrawing p-substituents on the arylhydrosilane improve the reaction rate and 3: a maximal kinetic isotopic effect (k_SiH/k_SiD=4.7) is seen for Ph₃SiX (X = H, D). DFT calculations identified the prevailing mechanism; instead of an inaccessible ¦Ò-bond-breaking metathesis pathway, the CDC appears to follow a stepwise reaction path with N-Si bond-forming nucleophilic attack of the catalytically competent Ba pyrrolide onto the incoming silane, followed by rate limiting H-atom transfer to Ba. The participation of a Ba silyl species is prevented energetically. The reactivity trend Ca<Sr<Ba results from greater accessibility of the metal center and decreasing Ae-N_amide bond strength upon descending Group 2.

Chemistry – A European Journal published new progress about 140-28-3. 140-28-3 belongs to catalysis-chemistry, auxiliary class Benzenes, name is N1,N2-Dibenzylethane-1,2-diamine, and the molecular formula is C16H20N2, COA of Formula: C16H20N2.

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