Catalysis-chemistry

Lozano-Munoz, Ivonne published the artcileHerbivorous fish (Medialuna ancietae) as a sustainable alternative for nutrition security in Northern Chile, Synthetic Route of 6217-54-5, the publication is Scientific Reports (2022), 12(1), 1619, database is CAplus and MEDLINE.

Sustainability in aquaculture is a necessity of the future, not only as the most promising means of supplying the protein that the world will require to feed its growing population but to offer needed conservation of the world¡äs ocean resources. The use of wild fish inputs in farm-raised fish outputs has been a primary concern of sustainability in aquaculture production Herbivorous fish are more efficient converters of protein into fish flesh. Species of the genus Medialuna fish have been reported as a fast-growing, short-lived species. The native fish Acha (Medialuna ancietae Chirichigno 1987) in the Northern part of Chile is an over-exploited fish that has been associated with aquatic vegetation as a food source. We studied the feeding habits and nutritional composition of M. ancietae. For this, we developed a reference collection of marine macroalga (epidermis and nutritional composition) observed in the diet of individuals of this species for the study of digestive material. More than 90% of the components found were marine macroalgae, indicating that M. ancietae is an herbivorous fish. Compared to non-herbivorous fish our results showed that most of the nutrients present in the Medialuna diet are found at much lower levels including n-3 long-chain polyunsaturated fatty acids (49.7%) and protein (13-60%). M. ancietae meat provides essential components of human nutrition with a significant protein content (18.99 ¡À 0.26%) and 268 ¡À 5.9 mg/100 g of the essential n-3 long-chain polyunsaturated fatty acids. Most fed aquaculture non-herbivorous species rely on wild-captured fish for these essential nutrients, while M. ancietae can obtain and concentrate them from potentially cultivable macroalgae. M. ancietae has potential for sustainable aquaculture production as a contribution to nutrition security and the re-stocking of wild populations.

Scientific Reports 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, Synthetic Route of 6217-54-5.

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

Forchetti Casarino, Agustin published the artcileSynthesis and characterization of polybenzoxazine/silica-based hybrid nanostructures for flame retardancy applications, Formula: C6H17NO3Si, the publication is Polymer Engineering & Science (2022), 62(5), 1386-1398, database is CAplus.

The objective of this study is to develop polybenzoxazine-silica nanocomposite systems endowed with greater thermal and fire performance. For this purpose, the 3-aminopropyltrimethoxysilane and bisphenol A-based benzoxazine (BA-3aptms) was synthesized. Also, smooth and spherical silica nanoparticles of 50 nm size were prepared following the Stober’s method. The influence of the nanoparticle size and geometry on the properties (laminar morphol., thermal, dynamic-mech., hydrophobicity, and flame retardancy) of the polybenzoxazine/polysilsesquioxane material was investigated. Also, nanocomposites from the conventional benzoxazine (BA-a) and SiO₂ nanoparticles were synthesized for comparative purposes. The addition of nanoparticles in both polybenzoxazines improved the mech., thermal and flammability properties. Likewise, the presence of these nanoparticles conferred to the material a more hydrophobic surface (contact angle around 95¡ã). Particularly, the Pr(BA-3aptms)/NP nanocomposites presented better properties than the BA-a-based systems, due to the presence of laminar-oriented polysilsesquioxane networks chem. bonded to the silica nanoparticles at nanoscale.

Polymer Engineering & Science 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, Formula: C6H17NO3Si.

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

McCann, Malachy published the artcileSynthesis, x-ray crystal structure and catalytic activity of the manganese(II) complex [Mn(bdoa)(H₂O)₃] (bdoaH₂ = Benzene-1,2-dioxyacetic acid), Recommanded Product: 2,2-(1,2-Phenylenebis(oxy))diacetic acid, the publication is Polyhedron (1996), 15(13), 2117-20, database is CAplus.

Benzene-1,2-dioxyacetic acid (bdoaH₂) reacts with Mn(CH₃CO₂)₂¡¤4H₂O in an EtOH-H₂O mixture to give the Mn(II) complex [Mn(bdoa)(H₂O)₃]. The x-ray crystal structure of the complex shows the metal to be pseudo seven-coordinate. The quadridentate bdoa^2- dicarboxylate ligand forms an essentially planar girdle around the metal, being strongly bonded transoid by a carboxylate O atom from each of the two carboxylate moieties (mean Mn-O 2.199 ?) and also weakly chelated by the two internal ether O O atoms (mean Mn-O 2.413 ?). The coordination sphere about the Mn is completed by three H₂O mols. (mean Mn-O 2.146 ?) lying in a meridional plane orthogonal to that of the bdoa^2- ligand. Magnetic, conductivity and voltammetry data for the complex are given, and its use as a catalyst for the disproportionation of H₂O₂ is described.

Polyhedron 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, Recommanded Product: 2,2-(1,2-Phenylenebis(oxy))diacetic acid.

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

Basinger, Mark A. published the artcileStructural requirements for mercury(II) antidotes, Computed Properties of 38260-01-4, the publication is Journal of Inorganic and Nuclear Chemistry (1981), 43(6), 1419-25, database is CAplus.

In order to determine the structural requirements for Hg(II) antidotes, stability constants were determined for Hg(II) complexes with thiol-containing ligands, and the relative efficacy was examined of 29 compounds as antidotes for Hg poisoning. Examples are not found in which 2 thiol groups on the same chelate mol. are simultaneously bonded to the same Hg(II) species, and Hg(II) complexes becoming 2 S donors generally have a bond angle of ?180¡ã between these 2 bonds. In general, mols. which are not potential chelates are inferior as antidotes; the presence of a second donor group is required, apparently to provide the necessary kinetic stability of the complex. In the case of dithiols, Hg may move back and forth from a S donor site to another but may not (and possibly cannot) bind firmly and simultaneously to both donor sites.

Journal of Inorganic and Nuclear Chemistry 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, Computed Properties of 38260-01-4.

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

Stevanato, Gabriele published the artcileOpen and Closed Radicals: Local Geometry around Unpaired Electrons Governs Magic-Angle Spinning Dynamic Nuclear Polarization Performance, COA of Formula: C10H25NO2Si, the publication is Journal of the American Chemical Society (2020), 142(39), 16587-16599, database is CAplus and MEDLINE.

The development of magic-angle spinning dynamic nuclear polarization (MAS DNP) has allowed at.-level characterization of materials for which conventional solid-state NMR is impractical due to the lack of sensitivity. The rapid progress of MAS DNP has been largely enabled through the understanding of rational design concepts for more efficient polarizing agents (PAs). Here, we identify a new design principle which has so far been overlooked. We find that the local geometry around the unpaired electron can change the DNP enhancement by an order of magnitude for two otherwise identical conformers. We present a set of 13 new stable mono- and dinitroxide PAs for MAS DNP NMR where this principle is demonstrated. The radicals are divided into two groups of isomers, named open (O-) and closed (C-), based on the ring conformations in the vicinity of the N-O bond. In all cases, the open conformers exhibit dramatically improved DNP performance as compared to the closed counterparts. In particular, a new urea-based biradical named HydrOPol and a mononitroxide O-MbPyTol yield enhancements of 330 ¡À 60 and 119 ¡À 25, resp., at 9.4 T and 100 K, which are the highest enhancements reported so far in the aqueous solvents used here. We find that while the conformational changes do not significantly affect electron spin-spin distances, they do affect the distribution of the exchange couplings in these biradicals. Electron spin echo envelope modulation (ESEEM) experiments suggest that the improved performance of the open conformers is correlated with higher solvent accessibility.

Journal of the American Chemical Society published new progress about 215297-17-9. 215297-17-9 belongs to catalysis-chemistry, auxiliary class Linker,PROTAC Linker, name is 2-(2-((tert-Butyldimethylsilyl)oxy)ethoxy)ethan-1-amine, and the molecular formula is C4H6BrFO2, COA of Formula: C10H25NO2Si.

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

Sauvee, Claire published the artcileTailoring of Polarizing Agents in the bTurea Series for Cross-Effect Dynamic Nuclear Polarization in Aqueous Media, Application of 2-(2-((tert-Butyldimethylsilyl)oxy)ethoxy)ethan-1-amine, the publication is Chemistry – A European Journal (2016), 22(16), 5598-5606, database is CAplus and MEDLINE.

A series of 18 nitroxide biradicals derived from bTurea has been prepared, and their enhancement factors ¦Å (¹H) in cross-effect dynamic nuclear polarization (CE DNP) NMR experiments at 9.4 and 14.1 T and 100 K in a DNP-optimized glycerol/water matrix (“DNP juice”) have been studied. We observe that ¦Å (¹H) is strongly correlated with the substituents on the polarizing agents, and its trend is discussed in terms of different mol. parameters: solubility, average e-e distance, relative orientation of the nitroxide moieties, and electron spin relaxation times. We show that too short an e-e distance or too long a T_1e can dramatically limit ¦Å (¹H). Our study also shows that the mol. structure of AMUPol is not optimal and its ¦Å (¹H) could be further improved through stronger interaction with the glassy matrix and a better orientation of the TEMPO moieties. A new AMUPol derivative introduced here provides a better ¦Å (¹H) than AMUPol itself (by a factor of ca. 1.2).

Chemistry – A European Journal published new progress about 215297-17-9. 215297-17-9 belongs to catalysis-chemistry, auxiliary class Linker,PROTAC Linker, name is 2-(2-((tert-Butyldimethylsilyl)oxy)ethoxy)ethan-1-amine, and the molecular formula is C10H25NO2Si, Application of 2-(2-((tert-Butyldimethylsilyl)oxy)ethoxy)ethan-1-amine.

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

Hill, Robert A. published the artcileBiosynthesis of fungal metabolites. Terrein, a metabolite of Aspergillus terreus Thom, SDS of cas: 1860-58-8, the publication is Journal of the Chemical Society, Perkin Transactions 1: Organic and Bio-Organic Chemistry (1972-1999) (1981), 2570-6, database is CAplus.

Terrein (I), a metabolite of A. terreus, was shown by incorporation experiments with labeled precursors to be biosynthesized from 3,4-dihydro-6,8-dihydroxy-3-methylisocoumarin (II) by contraction of an aryl ring. The direction of the ring contraction was studied with acetate-1,2–¹³C₂ as precursor.

Journal of the Chemical Society, Perkin Transactions 1: Organic and Bio-Organic Chemistry (1972-1999) published new progress about 1860-58-8. 1860-58-8 belongs to catalysis-chemistry, auxiliary class Carboxylic acid,Benzene,Ether, name is 2-(3-(Benzyloxy)phenyl)acetic acid, and the molecular formula is C15H14O3, SDS of cas: 1860-58-8.

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

Brogan, Samantha published the artcileCopper-bisphosphine-initiated pentafluorophenylation of aldehydes and ketones, COA of Formula: C9H9F5Si, the publication is Synlett (2010), 615-617, database is CAplus.

In the presence of substoichiometric quantities of a copper-bisphosphine complex, a variety of aldehydes and reactive ketones undergo pentafluorophenylation to provide corresponding pentafluorophenylmethanols by using pentafluorophenyltrimethylsilane.

Synlett published new progress about 1206-46-8. 1206-46-8 belongs to catalysis-chemistry, auxiliary class Organic Silicones, name is Trimethyl(perfluorophenyl)silane, and the molecular formula is C9H9F5Si, COA of Formula: C9H9F5Si.

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

Evans, Helen L. published the artcileBioorthogonal chemistry for ⁶⁸Ga radiolabelling of DOTA-containing compounds, Formula: C25H21N3O4, the publication is Journal of Labelled Compounds and Radiopharmaceuticals (2014), 57(4), 291-297, database is CAplus and MEDLINE.

Copper-catalyzed ‘click’ chem. is a highly used technique for radiolabeling small mols. and peptides for imaging applications. The usefulness of these reactions falls short, however, when metal catalysis is not a practically viable route; such as when using metal chelates as radioligands. Here, the authors describe a method for carrying out ‘click-type’ radiochem. in the presence of DOTA chelates, by combining ⁶⁸Ga radiolabeling techniques with well-established bioorthogonal reactions, which do not rely upon metal catalysis.

Journal of Labelled Compounds and Radiopharmaceuticals published new progress about 1395786-30-7. 1395786-30-7 belongs to catalysis-chemistry, auxiliary class Inhibitor, name is Dbco-maleimide, and the molecular formula is C25H21N3O4, Formula: C25H21N3O4.

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

Moon, Hyun June published the artcileUnderstanding the Impacts of Support-Polymer Interactions on the Dynamics of Poly(ethyleneimine) Confined in Mesoporous SBA-15, Computed Properties of 13822-56-5, the publication is Journal of the American Chemical Society (2022), 144(26), 11664-11675, database is CAplus and MEDLINE.

Supported amines are a promising class of CO₂ sorbents offering large uptake capacities and fast uptake rates. Among supported amines, poly(ethyleneimine) (PEI) phys. impregnated in the mesopores of SBA-15 silica is widely used. Within these composite materials, the chain dynamics and morphologies of PEI strongly influence the CO₂ capture performance, yet little is known about chain and macromol. mobility in confined pores. Here, we probe the impact of the support-PEI interactions on the dynamics and structures of PEI at the support interface and the corresponding impact on CO₂ uptake performance, which yields critical structure-property relationships. The pore walls of the support are grafted with organosilanes with different chem. end groups to differentiate interaction modes (spanning from strong attraction to repulsion) between the pore surface and PEI. Combinations of techniques, such as quasi-elastic neutron scattering (QENS), ¹H T₁-T₂ relaxation correlation solid-state NMR, and mol. dynamics (MD) simulations, are used to comprehensively assess the phys. properties of confined PEI. We hypothesized that PEI would have faster dynamics when subjected to less attractive or repulsive interactions. However, we discover that complex interfacial interactions resulted in complex structure-property relationships. Indeed, both the chain conformation of the surface-grafted chains and of the PEI around the surface influenced the chain mobility and CO₂ uptake performance. By coupling knowledge of the dynamics and distributions of PEI with CO₂ sorption performance and other characteristics, we determine that the macroscopic structures of the hybrid materials dictate the first rapid CO₂ uptake, and the rate of CO₂ sorption during the subsequent gradual uptake stage is determined by PEI chain motions that promote diffusive jumps of CO₂ through PEI-packed domains.

Journal of the American Chemical Society 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, Computed Properties of 13822-56-5.

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