Catalysis-chemistry

Nwajiobi, Ogonna published the artcileRapid arene triazene chemistry for macrocyclization, Product Details of C20H19NO4, the publication is Journal of the American Chemical Society (2022), 144(10), 4633-4641, database is CAplus and MEDLINE.

Here, we report a novel rapid arene triazene strategy for the macrocyclization of peptides that generates an inbuilt chromophoric triazene moiety at the site of cyclization within a minute. The rapid arene triazene chem. is chemoselective for secondary amines and p-amino phenylalanine. Importantly, the resulting triazene cyclic peptide is highly stable at neutral pH and under harsh conditions but rapidly responds to various external stimuli such as UV radiations and acidic conditions, resulting in the ring opening to generate the linear peptides in an unchanged form, which further cyclizes under neutral pH conditions. This method works with completely unprotected peptides and has been applied for the synthesis of 18- to 66-membered monocycles and bicycles with various amino acid compositions in one pot under neutral pH conditions. Due to the high stability of triazene cyclic peptides, the postcyclization modification was carried out with various functional groups. This rapid, macrocyclization strategy featuring a triazene scaffold, amenable to late-stage diversification and responsive to external stimuli, should find application in various fields of chem. biol., selective drug delivery, and identification of cyclic peptide hits after library screening.

Journal of the American Chemical Society 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 C20H19NO4, Product Details of C20H19NO4.

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

Jana, Sadhan published the artcileSynthesis of Novel C₂-Symmetric Sulfur-Based Catalysts: Asymmetric Formation of Halo- and Seleno-Functionalized Normal- and Medium-Sized Rings, Synthetic Route of 2051-95-8, the publication is Synlett (2019), 30(14), 1667-1672, database is CAplus.

The synthesis of novel, highly functionalized, C₂-sym. sulfur-based catalysts was developed and their catalytic applications explored in the asym. bromo-, iodo- and seleno-functionalizations of alkenoic acids, e.g., 2-(3-buten-1-yl)benzoic acid. This protocol provides the corresponding normal- and medium-sized bromo, iodo and selenolactones, e.g., I, in up to 98% yield and 83% stereoselectivity.

Synlett 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, Synthetic Route of 2051-95-8.

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

Giumanini, Angelo G. published the artcileRevisitation of the formaldehyde-aniline condensation. VIII. Monomeric N-methyleneanilines, COA of Formula: C14H23N, the publication is Journal fuer Praktische Chemie (Leipzig) (1988), 330(2), 161-74, database is CAplus.

A convenient, high yield method for the preparation of monomeric N-methyleneanilines I (R = Me, Et, CHMe₂; R¹ = H, 4-Br, 3-O₂N) and the characterization of the products by mass spectrometry, ¹H- and ¹³C-NMR, and IR are reported, improving previous procedures and describing new compounds The existence of monomeric N-methyleneanilines is strictly related to the presence of enough steric hindrance to prevent oligomerization by substituents in ortho positions. Some imines are tentatively identified on the basis of the observed mass spectrum of the reaction mixture I (R = Me, R¹ = H) provided an example of a mobile equilibrium between a monomeric and trimeric imine.

Journal fuer Praktische Chemie (Leipzig) published new progress about 2909-77-5. 2909-77-5 belongs to catalysis-chemistry, auxiliary class Amine,Benzene, name is 2,6-Diisopropyl-N,N-dimethylaniline, and the molecular formula is C14H23N, COA of Formula: C14H23N.

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

Thirupugalmani, K. published the artcileInfluence of polar solvents on growth of potentially NLO active organic single crystals of N-benzyl-2-methyl-4-nitroaniline and their efficiency in terahertz generation, Recommanded Product: N-Benzyl-2-methyl-4-nitroaniline, the publication is CrystEngComm (2017), 19(19), 2623-2631, database is CAplus.

We report on the growth of N-benzyl-2-methyl-4-nitroaniline (BNA) crystals by a solution growth method using certain polar protic and aprotic solvents (single or mixed). It was observed that the morphol. of the BNA crystals could be influenced by the solvents used and that the growth was, with certain exceptions, predominant along the crystallog. b axis. Attempts to grow large BNA crystals from these solvents showed that the majority of these polar solvent mols. tended to get adsorbed preferentially along the polar +c and/or -c axes/axis. The bulk and surface qualities of the grown crystals were observed to be influenced by the solvents employed to grow the BNA crystals and the results of THz measurements obtained for the crystals grown from selected solvents were also found to corroborate these observations. A systematic approach has shown that the BNA crystals grown from one of the polar aprotic solvents, which is presumably reported for the first time for this crystal, exhibited a relatively higher THz efficiency. It is further understood that this particular solvent created a favorable solute-solvent environment at the progressing crystal-solution interface which improved the overall quality of the BNA single crystals and resulted in the significant enhancement in the THz efficiencies.

CrystEngComm published new progress about 201157-13-3. 201157-13-3 belongs to catalysis-chemistry, auxiliary class Nitro Compound,Amine,Benzene, name is N-Benzyl-2-methyl-4-nitroaniline, and the molecular formula is C12H10F2Si, Recommanded Product: N-Benzyl-2-methyl-4-nitroaniline.

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

Amesh, Pamarthi published the artcileEfficient and selective adsorption of U(VI) by succinic acid modified iron oxide adsorbent, Recommanded Product: 3-(Trimethoxysilyl)propan-1-amine, the publication is Radiochimica Acta (2022), 110(5), 333-347, database is CAplus.

The iron oxide surface was modified with succinic acid moiety and the adsorbent obtained, Fe-SUC, was evaluated for the adsorption of U(VI) (Uranium (VI)) from aqueous solution The Fe-SUC was characterized by FT-IR (Fourier Transform IR Spectroscopy), Raman spectroscopy, thermogravimetry, X-ray diffraction, SEM-EDX (Scanning Electron Microscope – Energy-dispersive X-ray Spectroscopy), and particle size anal. The adsorption behavior of U(VI) on Fe-SUC was studied as a function of pH, contact time, and concentration of U(VI) in the aqueous phase. The adsorption of U(VI) increased with increase in the pH of aqueous phase, and the adsorption saturation occurred at pH = 6. The kinetic data obtained for the adsorption of U(VI) on Fe-SUC were modeled with the pseudo-first-order and pseudo-second-order rate models. Similarly, the U(VI) adsorption isotherm was fitted with Langmuir, Freundlich, Temkin, and Dubinin-Radushkevich adsorption isotherm models. The Langmuir adsorption capacity of U(VI) on Fe-SUC was about ?176 mg g^-1. The selectivity of the adsorbent toward U(VI) was evaluated in the presence of several possible interfering ions. The adsorbed U(VI) was recovered by 0.5 M sodium carbonate solution and the spent adsorbent was tested for its reusability.

Radiochimica Acta published new progress about 13822-56-5. 13822-56-5 belongs to catalysis-chemistry, auxiliary class Organic Silicones, name is 3-(Trimethoxysilyl)propan-1-amine, and the molecular formula is C6H17NO3Si, Recommanded Product: 3-(Trimethoxysilyl)propan-1-amine.

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

Das, Saibal Kumar published the artcileNovel route of synthesis of some trientine impurities and their characterization, SDS of cas: 38260-01-4, the publication is Pharma Chemica (2021), 13(4), 23-31, database is CAplus.

Trientine has been tested for inhibition of the spontaneous development of hepatitis and hepatic tumors in rats. It has been described in the use of copper binding compounds in the treatment of various disorders, including treatment of diabetes mellitus and complications thereof, including diabetic cardiomyopathy. The first synthesis of Impurities A, B, C, D, E, G and H along with Impurity F via innovative approach starting from cheap raw materials is reported.

Pharma Chemica 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 C6H20Cl2N4, SDS of cas: 38260-01-4.

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

Wu, Yan published the artcileBroad Exposure of the North American Environment to Phenolic and Amino Antioxidants and to Ultraviolet Filters, Category: catalysis-chemistry, the publication is Environmental Science & Technology (2020), 54(15), 9345-9355, database is CAplus and MEDLINE.

This work comprehensively assessed three suites of commonly used synthetic additives: phenolic and amino antioxidants and UV filters. Concentrations of 47 such compounds and their transformation products were measured in 20 atm. particle samples collected at Chicago, Illinois, in 21 Canadian e-waste dust samples, in 32 Canadian and US residential dust samples, and in 10 Chicago Sanitary and Ship Canal sediment samples. Despite their large US production volumes, environmental data on antioxidants and UV filters in North America is limited. These compounds were detected in all samples, indicating their ubiquitous distribution in the North American environment. The most prevalent compounds were 2,6-di-t-butyl-p-benzoquinone, diphenylamine, 4,4′-di-t-octyl diphenylamine, 2,4-dihydroxybenzophenone, and 2-hydroxy-4-methoxybenzophenone. E-waste dust contained significantly greater total concentrations of these compounds than Canadian residential dust; intermediate levels were detected in US residential dust. Sediment had relatively high N,N’-diphenylbenzidine concentrations whose source was unclear, and some benzotriazole UV filters. Daily intake rates via dust ingestion for these compounds were 1-10 ng/kg-day for adults to 10-100 ng/kg-day for toddlers. Due to the wide distribution of these compounds in ambient and built environments, future research on their potential toxic effects on people and ecosystems is important.

Environmental Science & Technology 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 C5H13Cl2N, Category: catalysis-chemistry.

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

Naydenova, St. published the artcileAtmospheric levels, distribution, sources, correlation with meteorological parameters and other pollutants and health risk of PAHs bound in PM_2.5 and PM₁₀ in Burgas, Bulgaria – a case study, Name: Coronene, the publication is Journal of Environmental Science and Health, Part A: Toxic/Hazardous Substances & Environmental Engineering (2022), 57(4), 306-317, database is CAplus and MEDLINE.

The quality of atm. air of Burgas city, Bulgaria was analyzed in relation to PAHs in two particulate matter fractions – 2.5¦Ìm and 10¦Ìm. It was found that PAHs registered in PM₁₀ represent entirely the ones registered in PM_2.5 – an indication that the particulate PAHs in ambient air of Burgas for the sampling period are associated with the fine PM fraction. The PAH compounds with highest concentrations are mainly associated with coal combustion, diesel and gasoline vehicle and biomass burning, which is further confirmed by the calculated diagnostic ratios. The combustion-derived PAHs represent on average 86.6 ¡À 2.8% of total PAHs concentration The linear regression anal. showed strong and statistically meaningful correlations between PM fractions and PAHs indicating the influence of similar local events and emission sources of pollution. PM_2.5 or PM₁₀ relationships with PAHs were significant but lower correlation coefficients were observed for low-mol. weight (LMW) PAHs in comparison to middle-mol. weight (MMW) and higher-mol. weight (HMW) PAHs, due to their lower presence in particulates and higher partition in gaseous atm. phase. Further significant correlations were found with wind speed, solar radiation and atm. pressure as well as NO₂ and O₃ ambient concentration The calculated excess cancer risks are twice as much as acceptable limit.

Journal of Environmental Science and Health, Part A: Toxic/Hazardous Substances & Environmental Engineering 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, Name: Coronene.

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

Sundararaju, Kavya published the artcileSynthesis of palladium nanoparticles using triazolium based ionic liquids: A reusable catalyst for addition of arylboronic acids to nitrostyrenes, Synthetic Route of 4230-93-7, the publication is Synthetic Communications (2018), 48(23), 3000-3014, database is CAplus.

Palladium nanoparticles containing an octyltriazolium trifluoroacetate ionic liquid were prepared as a recyclable catalyst for the addition of arylboronic acids to ¦Â-nitrostyrenes to give diarylnitroethanes.

Synthetic Communications 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 C3H8N2S, Synthetic Route of 4230-93-7.

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

Khoukhi, Mostafa published the artcileCurtius rearrangement of ¦Ø-azido acid chlorides: access to the corresponding ¦Ø-azido substituted amines and carbamates, useful building blocks for polyamine syntheses, Quality Control of 10517-44-9, the publication is Synthesis (1996), 483-7, database is CAplus.

Treatment of ¦Ø-azido acid chlorides with Me₃SiN₃ affords ¦Ø-azido isocyanates which were easily converted in good yields to the corresponding ¦Ø-azidoamines or ¦Ø-azidocarbamates. 1,3- And 1,4-diamine dihydrochlorides were then prepared by catalytic hydrogenation or reductive alkylation with an organodichloroborane.

Synthesis published new progress about 10517-44-9. 10517-44-9 belongs to catalysis-chemistry, auxiliary class Salt,Amine,Aliphatic hydrocarbon chain, name is Propane-1,3-diamine dihydrochloride, and the molecular formula is C3H12Cl2N2, Quality Control of 10517-44-9.

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