Catalysis-chemistry

Allott, Louis published the artcileDetecting hypoxia in vitro using ¹⁸F-pretargeted IEDDA “click” chemistry in live cells, Related Products of catalysis-chemistry, the publication is RSC Advances (2021), 11(33), 20335-20341, database is CAplus and MEDLINE.

We have exemplified a pretargeted approach to interrogate hypoxia in live cells using radioactive bioorthogonal inverse electron demand Diels-Alder (IEDDA) “click” chem. Our novel ¹⁸F-tetrazine probe ([¹⁸F]FB-Tz) and 2-nitroimidazole-based TCO targeting mol. (8) showed statistically significant (P < 0.0001) uptake in hypoxic cells (ca. 90%ID per mg) vs. normoxic cells (<10%ID per mg) in a 60 min incubation of [¹⁸F]FB-Tz. This is the first time that an intracellularly targeted small-mol. for IEDDA “click” has been used in conjunction with a radioactive reporter mol. in live cells and may be a useful tool with far-reaching applicability for a variety of applications.

RSC Advances published new progress about 1466420-02-9. 1466420-02-9 belongs to catalysis-chemistry, auxiliary class Copper-Free Click Chemistry,Tetrazine, name is (4-(6-Methyl-1,2,4,5-tetrazin-3-yl)phenyl)methanamine trifluoroacetic acid, and the molecular formula is C12H12F3N5O2, Related Products of catalysis-chemistry.

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

Saiegh, Tomas J. published the artcileRhodium(III)-Catalyzed C(sp²)-H Functionalization of Cyclobutenes. Access to Cyclobuta[c]pyridones and -pyridines, Computed Properties of 1293990-73-4, the publication is Organic Letters (2019), 21(20), 8364-8368, database is CAplus and MEDLINE.

O-(¦Ø-Alkynyl) hydroxamates derived from cyclobutenyl carboxylic acids were identified as viable substrates in intramol. rhodium(III)-catalyzed heteroannulations, which led to diversely substituted cyclobuta[c]pyridones. Further functionalization of the resulting cyclobutapyridones enabled the synthesis of cyclobuta[c]pyridines and other nitrogen heterocycles after electrocyclic ring opening of the four-membered ring.

Organic Letters published new progress about 1293990-73-4. 1293990-73-4 belongs to catalysis-chemistry, auxiliary class Aliphatic Chain, name is O-Pivaloylhydroxylamine trifluoromethanesulfonate, and the molecular formula is C6H12F3NO5S, Computed Properties of 1293990-73-4.

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

Stephens, David E. published the artcileSynthetic and mechanistic aspects of the regioselective base-mediated reaction of perfluoroalkyl- and perfluoroarylsilanes with heterocyclic N-oxides, Safety of Trimethyl(perfluorophenyl)silane, the publication is Organic & Biomolecular Chemistry (2014), 12(32), 6190-6199, database is CAplus and MEDLINE.

The scope and mechanistic implications of the direct transformation of heterocyclic N-oxides to 2-trifluoromethyl-, and related perfluoroalkyl- and perfluoroaryl-substituted N-heterocycles has been studied. The reaction is effected by perfluoroalkyl- and perfluorophenyltrimethylsilane in the presence of strong base. In situ displacement of the para-fluoro substituent in the pentafluorophenyl ring and the methoxy group in 8-methoxyquinolines with addnl. nucleophiles allows for further site-selective refunctionalization of the N-heterocyclic products.

Organic & Biomolecular Chemistry 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 C15H10O2, Safety of Trimethyl(perfluorophenyl)silane.

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

Mousavi, Bibimaryam published the artcileCarbazole as linker for dinuclear gadolinium-based MRI contrast agents, Safety of Bis(4-nitrophenyl)amine, the publication is European Journal of Inorganic Chemistry (2017), 2017(45), 5403-5412, database is CAplus.

Ligands able to complex two gadolinium ions have been synthesized and characterized in view of the ability of the complexes to increase the spin relaxation of water protons. All ligands are based on the heptadentate diethylenetriaminetetraacetic acid (DTTA) chelator and carbazole as a rigid linker. Depending on the derivatization on the nitrogen atom of the five-membered ring, the compounds form small aggregates in aqueous solution, self-assemble to form micelles or bind to human serum albumin. In all cases, this leads to a marked increase in ¹H relaxivity at nuclear Larmor frequencies between 20 and 60 MHz. Water exchange on the gadolinium ions as measured by ¹⁷O NMR relaxation is fast enough not to limit relaxivity. ¹H nuclear magnetic relaxation dispersion profiles were also measured and analyzed using Solomon-Bloembergen-Morgan theory including Lipari-Szabo treatment to include internal motion or anisotropic rotation.

European Journal of Inorganic Chemistry 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, Safety of Bis(4-nitrophenyl)amine.

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

Maurya, Mannar R. published the artcileAmine-functionalized titanium dioxide supported dioxidomolybdenum(VI) complexes as functional model for phenoxazinone synthase enzyme, HPLC of Formula: 13822-56-5, the publication is Catalysis Today (2022), 274-287, database is CAplus.

Two dioxidomolybdenum(VI) complexes, [Mo^VIO₂{H₂dfba(bhz)₂}(H₂O)] (1) and [Mo^VIO₂{H₂dfba(fah)₂}(H₂O)] (2) of ligands H₄dfba(bhz)₂ (I) and H₄dfba(fah)₂ (II) (H₂dfba = 3,5-diformyl-4-hydroxybenzoic acid, Hbhz = benzoylhydrazide and Hfah = 2-furanoylhydrazide), resp. and their corresponding heterogenized complexes [Mo^VIO₂{Hdfba(bhz)₂}(H₂O)]@APTMS-TiO₂ (3) and [Mo^VIO₂{Hdfba(fah)₂}(H₂O)]@APTMS-TiO₂ (4) supported on amine-functionalized titanium dioxide (APTMS-TiO₂, III) have been isolated and characterized by various spectroscopic techniques (FT-IR, UV-vis, diffusion reflectance, ¹H and ¹³C NMR), elemental anal. (C, H and N), thermal, TEM and powder-XRD studies. Single-crystal x-ray study of [Mo^VIO₂{H₂dfba(bhz)₂}(EtOH)]¡¤EtOH (1a¡¤EtOH) confirms the octahedral structure. Both homogeneous and heterogeneous complexes have been explored as phenoxazinone synthase mimicking catalysts in the oxidation of 2-aminophenol to 2-aminophenoxazine-3-one in acetonitrile in the presence of aqueous H₂O₂. The k_cat value for the phenoxazinone synthase-like activity was 1.46 x 10^-3 and 3.26 x 1 0^-3 min^-1 for catalysts 1 and 2, resp. Catalysts 1, 2, 3 and 4 also gave 91, 86, 94 and 88% yield of 2-aminophenoxazine-3-one (APX), resp., under the optimized reaction conditions.

Catalysis Today 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, HPLC of Formula: 13822-56-5.

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

Verma, R. N. published the artcileComparative study of semi empirical calculations of energies and densities of frontier orbitals of Lewis acids and bases, Computed Properties of 6972-05-0, the publication is Inorganic Chemistry: An Indian Journal (2008), 3(2), 154-162, database is CAplus.

Energies and densities of certain Lewis acids and bases have been evaluated by semi empirical methods. AM1, PM3 and PM5, on CACHe Software. The energy values have been mainly used to prepare the scale of hardness, and d. values for identifying sites in different compounds The metal-ligand interaction and the stability of metal-ligand bond have been studied with the help of LUMO d. values of accepter mols. and HOMO d. values of donor mols. The stability of metal ligand bond has also been related with transfer of charge ¦¤N and lowering of energy ¦¤E on complex formation.

Inorganic Chemistry: An Indian Journal 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 C6H10O7, Computed Properties of 6972-05-0.

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

Kesharwani, Neha published the artcileSynthesis and characterization of Merrifield resin and graphene oxide supported air stable oxidovanadium(IV) radical complexes for the catalytic oxidation of light aliphatic alcohols, Product Details of C6H17NO3Si, the publication is Catalysis Today (2022), 604-617, database is CAplus.

Imidazole modified Merrifield resin and (3-Aminopropyl)trimethoxysilane-modified graphene oxide supported oxidovanadium(IV) radical complexes PS-i.m.-[V^IVO(tbnC^¡¤)(acac)] (1) and GO-ATPMS-[V^IVO(tbnO^¡¤)(acac)] (2) were synthesized and characterized by various spectroscopic, thermal and chem. techniques. The radical nature of 1 and 2 was established by trapping experiments in addition to EPR spectroscopy. In EPR anal., complex 2 shows a prominent signal with g = 2.005, characteristic of an oxygen-centered radical. The neat complex [V^IVO(tbnC^¡¤)(acac)] (A) displays an EPR signal at g = 2.0025, typical of carbon-centered radical. On the contrary, such characteristic EPR signal of a radical is absent in complex 1, presumably due to spin pairing. XPS anal. confirms the +4 oxidation state of vanadium in fresh as well as recycled catalysts 1 and 2. Both the supported complexes show excellent catalytic activity towards a variety of aliphatic alcs. Comparatively, the polymer-supported complex displays better substrate conversion than the graphene oxide-supported complex. However, 2 shows better selectivity towards aldehydes, whereas carboxylic acids are obtained as major products in the presence of 1. Interestingly, catalyst 1 is almost equally effective towards all the examined alcs., but its effectiveness reduces slightly for longer carbon chain alcs. On the other hand, catalyst 2 shows better substrate conversion for the alcs. with a longer carbon chain. During the catalytic oxidation of alcs., the active intermediate species oxidoperoxidovanadium(V) complex ([VO(O₂)(tbn)(acac-H)]^–) was detected by FT-IR, UV-vis, and LC-MS anal.

Catalysis Today 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, Product Details of C6H17NO3Si.

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

Cui, Jinlei published the artcileIn Situ ²⁹Si solid-state NMR study of grafting of organoalkoxysilanes to mesoporous silica nanoparticles, COA of Formula: C6H17NO3Si, the publication is Microporous and Mesoporous Materials (2022), 112019, database is CAplus.

Since the catalytic activity and the stability of silica-bound organometallic complexes are affected by their interactions with hydroxyl groups on the surface, isolated hydroxyls are often created prior to the introduction of catalytic species. Here, we investigate a method to remove the indigenous hydroxyls and create new isolated hydroxyls by grafting organo-trimethoxysilane (R-TMS) to generate a silicon T² site, (=SiO-)₂SiR(-OH). We used in situ ²⁹Si solid-state NMR experiments to monitor the evolution of Tn sites, (=SiO-)₂SiR(-OH)₃-n (n = 1, 2, 3). The study indicates that i) the grafting proceeds in a consecutive manner as T¹ ¡ú T² ¡ú T³, and ii) the kinetics depend on the type of functional groups in the silane. However, the rates of T¹ formation and T² ¡ú T³ conversion are also controlled to a significant extent by the entropy loss associated to the initial silane binding and the spatial arrangement of surface hydroxyls, resp. The grafting of R-TMS with a basic functional group leads to a lower concentration of T¹ sites. The nucleophilicity of the functional group facilitates the grafting process by lowering the enthalpy barrier, while the T¹ formation rate is more influenced by the entropy barrier than the T¹ ¡ú T² conversion rate. Thus, the basic functional group promotes the T¹ ¡ú T² conversion more than the T¹ formation, resulting in a lower concentration of T¹ sites.

Microporous and Mesoporous Materials 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, COA of Formula: C6H17NO3Si.

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

Toste, F. Dean published the artcileFunctional group diversity by ruthenium-catalyzed olefin cross-metathesis, Application of Allyldiphenylphosphine oxide, the publication is Pure and Applied Chemistry (2002), 74(1), 7-10, database is CAplus.

Ruthenium-catalyzed olefin cross-metathesis tolerates a wide range of functional groups, including phosphine-boranes, sulfides, amines, phenols, and oxazolines. The catalyst discussed here was [1,3-bis(2,4,6-trimethylphenyl)-2-imidazolidinylidene]dichloro(phenylmethylene)(tricyclohexylphosphine)ruthenium. The high functional group tolerance allows for the use of an olefin as a linchpin for the synthesis of a variety of bi-, tri-, and tetradentate chiral ligands with a high degree of functional group diversity. A lecture presented at the 11th annual IUPAC International Symposium on Organometallic Chem. Directed Toward Organic Synthesis (OMCOS-11), Taipei, Taiwan July 22-26, 2001.

Pure and Applied Chemistry published new progress about 4141-48-4. 4141-48-4 belongs to catalysis-chemistry, auxiliary class Aryl phosphine ligand,Mono-phosphine Ligands, name is Allyldiphenylphosphine oxide, and the molecular formula is C10H11NO4, Application of Allyldiphenylphosphine oxide.

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

Leung, Joe C. T. published the artcilePhoto-fluorodecarboxylation of 2-Aryloxy and 2-Aryl Carboxylic Acids, Category: catalysis-chemistry, the publication is Angewandte Chemie, International Edition (2012), 51(43), 10804-10807, database is CAplus and MEDLINE.

Transition-metal-free photo-fluorodecarboxylation of 2-aryloxy- and 2-arylacetic acids was accomplished via use of Selectfluor. E.g.., irradiation of an aqueous alk. solution of 4-FC₆H₄OCH₂CO₂H at 300 nm for 1 h in presence of Selectfluor gave up to 94% of the monofluoromethyl ether 4-FC₆H₄OCH₂F. Also prepared were difluoromethyl ethers.

Angewandte Chemie, International Edition published new progress about 1798-04-5. 1798-04-5 belongs to catalysis-chemistry, auxiliary class Carboxylic acid,Benzene,Ether, name is 2-(4-(tert-Butyl)phenoxy)acetic acid, and the molecular formula is C12H16O3, Category: catalysis-chemistry.

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