Author: tianli

The chemical properties of alicyclic heterocycles are similar to those of the corresponding chain compounds. Compound: (5aS,10bR)-2-(2,6-Diethylphenyl)-4,5a,6,10b-tetrahydro-2H-indeno[2,1-b][1,2,4]triazolo[4,3-d][1,4]oxazin-11-ium tetrafluoroborate, is researched, Molecular C22H24BF4N3O, CAS is 1787246-78-9, about A Carbene Catalysis Strategy for the Synthesis of Protoilludane Natural Products, the main research direction is carbene catalysis mellolide protoilludane marasmane sesquiterpenoid synthesis; N-heterocyclic carbenes; armillaridin; marasmane; protoilludane; total synthesis.SDS of cas: 1787246-78-9.

The Armillaria and Lactarius genera of fungi produce the antimicrobial and cytotoxic mellolide, protoilludane, and marasmane sesquiterpenoids. We report a unified synthetic strategy to access the protoilludane, mellolide, and marasmane families of natural products. The key features of these syntheses are (1) the organocatalytic, enantioselective construction of key chiral intermediates from a simple achiral precursor, (2) the utility of a key 1,2-cyclobutanediol intermediate to serve as a precursor to each natural product class, and (3) a direct chem. conversion of a protoilludane to a marasmane (I → II) through serendipitous ring contraction, which provides exptl. support for their proposed biosynthetic relationships.

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Epoxy compounds usually have stronger nucleophilic ability, because the alkyl group on the oxygen atom makes the bond angle smaller, which makes the lone pair of electrons react more dissimilarly with the electron-deficient system. Compound: Dichloro(1,5-cyclooctadiene)platinum(II), is researched, Molecular C8H12Cl2Pt, CAS is 12080-32-9, about Group 10 metal complexes with a tetradentate thiosemicarbazonate ligand: Synthesis, crystal structures and computational insights into the catalysis for C-C coupling via Mizoroki-Heck reaction.SDS of cas: 12080-32-9.

Mononuclear complexes were synthesized by reactions of Group 10 metal ions with bis(4-phenyl-3-thiosemicarbazone) (H2bPht), affording compounds [MII(bPht)] (M = Ni, Pd and Pt). Their characterization involved FTIR, UV-visible, 1H NMR, CV, DPV and elemental anal. Also, the crystal structures of all complexes were determined, showing that the thiosemicarbazonate ligand is coordinated as a tetradentate N,N,S,S-donor forming three five-membered chelate rings. The catalytic activity of [MII(bPht)] in Heck’s C-C coupling reaction using styrene and iodobenzene to obtain stilbenes was evaluated. It was verified that the NiII and PtII complexes present low catalytic activity, while the PdII complex showed a conversion of 99% within 24 h. Trans-stilbene was identified as the major product of the coupling reaction, up to 90%. DFT studies were also performed to better understand the catalytic behavior of these complexes giving support for a new route for Mizoroki-Heck reaction.

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Product Details of 16588-26-4. The fused heterocycle is formed by combining a benzene ring with a single heterocycle, or two or more single heterocycles. Compound: 3-Bromo-4-chloronitrobenzene, is researched, Molecular C6H3BrClNO2, CAS is 16588-26-4, about A Predictive Substrate Model for Rat Glutathione S-Transferase 4-4. Author is de Groot, Marcel J.; Van der Aar, Ellen M.; Nieuwenhuizen, Peter J.; Van der Plas, R. Martijn; Kelder, Gabrieelle M. Donne; Commandeur, Jan N. M.; Vermeulen, Nico P. E..

Mol. modeling techniques have been used to derive a substrate model for class mu rat glutathione S-transferase 4-4 (GST 4-4). Information on regio- and stereoselective product formation of 20 substrates covering three chem. and structurally different classes was used to construct a substrate model containing three interaction sites responsible for Lewis acid-Lewis base interactions (IS1, IS2, and IS3), as well as a region responsible for aromatic interactions (IS4). Exptl. data suggest that the first protein interaction site (pIS1, interacting with IS1) corresponds with Tyr115, while the other protein interaction sites (pIS2 and pIS3) probably correspond with other Lewis acidic amino acids. All substrates exhibited pos. mol. electrostatic potentials (MEPs) near the site of conjugation with glutathione (GSH), as well as neg. MEP values near the position of groups with Lewis base properties (IS1, IS2, or IS3), which interact with pIS1, pIS2, or pIS3, resp. Obviously, complementarity between the MEPs of substrates and protein in specific regions is important. The substrate specificity and stereoselectivity of GST 4-4 are most likely determined by pIS1 and the distance between the site of GSH attack and Lewis base atoms in the substrates which interact with either pIS2, pIS3, or a combination of these sites. Interaction between aromatic regions in the substrate with aromatic amino acids in the protein further stabilizes the substrate in the active site. The predictive value of the model has been evaluated by rationalizing the conjugation to GSH of 11 substrates of GST 4-4 (representing 3 classes of compounds) which were not used to construct the model. All known metabolites of these substrates are explained with the model. As the computer-aided predictions appear to correlate well with exptl. results, the presented substrate model may be useful to identify new potential GST 4-4 substrates.

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The chemical properties of alicyclic heterocycles are similar to those of the corresponding chain compounds. Compound: Pyridine-3,5-dicarbonitrile, is researched, Molecular C7H3N3, CAS is 1195-58-0, about Reduction of 3,5-disubstituted pyridines to dihydropyridines, the main research direction is pyridinecarboxylate reduction; solvent effect reduction pyridinecarboxylate.Related Products of 1195-58-0.

The pyridines (I, R = Me, Et) underwent reduction with NaBH4 to give mixtures of the corresponding 1,4- II and 1,2-dihydropyridines III, resp. The compositions of the isomer mixtures produced in various solvents were determined Reduction of I by NaBH3CN and by B2H6 gave II and III (R = Me, Et), resp.

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Recommanded Product: Dichloro(1,5-cyclooctadiene)platinum(II). Aromatic heterocyclic compounds can also be classified according to the number of heteroatoms contained in the heterocycle: single heteroatom, two heteroatoms, three heteroatoms and four heteroatoms. Compound: Dichloro(1,5-cyclooctadiene)platinum(II), is researched, Molecular C8H12Cl2Pt, CAS is 12080-32-9, about Phosphorus and Arsenic Atom Transfer to Isocyanides to Form π-Backbonding Cyanophosphide and Cyanoarsenide Titanium Complexes. Author is Reinholdt, Anders; Jafari, Mehrafshan G.; Sandoval-Pauker, Christian; Ballestero-Martinez, Ernesto; Gau, Michael R.; Driess, Matthias; Pinter, Balazs; Mindiola, Daniel J..

Decarbonylation along with E atom transfer from Na(OCE) (E = P, As) to an isocyanide coordinated to the tetrahedral TiII complex [(TptBu,Me)TiCl], yielded the [(TptBu,Me)Ti(η3-ECNAd)] species (Ad = 1-adamantyl, TptBu,Me- = hydrotris(3-tert-butyl-5-methylpyrazol-1-yl)borate). In the case of E = P, the cyanophosphide ligand displays nucleophilic reactivity toward Al(CH3)3; moreover, its bent geometry hints to a reduced Ad-NCP3- resonance contributor. The analogous and rarer mono-substituted cyanoarsenide ligand, Ad-NCAs3-, shows the same unprecedented coordination mode but with shortening of the N:C bond. As opposed to TiII, VII fails to promote P atom transfer to AdNC, yielding instead [(TptBu,Me)V(OCP)(CNAd)]. Theor. studies revealed the rare ECNAd moieties to be stabilized by π-backbonding interactions with the former TiII ion, and their assembly to most likely involve a concerted E atom transfer between Ti-bound OCE- to AdNC ligands when studying the reaction coordinate for E = P.

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Epoxy compounds usually have stronger nucleophilic ability, because the alkyl group on the oxygen atom makes the bond angle smaller, which makes the lone pair of electrons react more dissimilarly with the electron-deficient system. Compound: 3-Bromo-4-chloronitrobenzene, is researched, Molecular C6H3BrClNO2, CAS is 16588-26-4, about Efficient and recyclable bimetallic Co-Cu catalysts for selective hydrogenation of halogenated nitroarenes.Reference of 3-Bromo-4-chloronitrobenzene.

Silica supported N-doped carbon layers encapsulating Co-Cu nanoparticles (Co1Cux@CN/SiO2) were prepared by a one-step impregnation of Co(NO3)2·6H2O, Cu(NO3)2·3H2O, urea and glucose, following in situ carbothermal reduction Effects of Cu contents on the catalytic performance of the Co1Cux@CN/SiO2 catalysts were investigated for selective hydrogenation of p-chloronitrobenzene to p-chloroaniline. The Co1Cu0.30@CN/SiO2 with Cu/Co molar ratio of 0.30:1 presented much higher activity and stability than the monometallic Co@CN/SiO2 catalyst. The addition of Cu into Co1Cux@CN/SiO2 catalysts had favorable effects on the formation of highly active Co-N sites and N-doped carbon layer. The role of the N-doped carbon layer was to protect the Co from oxidation by air, and the Co1Cu0.30@CN/SiO2 could be reused for at least 12 cycles without decrease in catalytic efficiency. Mechanistic and in situ IR studies revealed that the interaction effect between the Co and Cu atoms made the surface of Co highly electron rich, which decreased adsorption of halogen groups and resulting in the enhanced selectivity during chemoselective hydrogenation of halogenated nitroarenes for a wide scope of substrates.

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So far, in addition to halogen atoms, other non-metallic atoms can become part of the aromatic heterocycle, and the target ring system is still aromatic.Rogovoy, Maxim I.; Davydova, Maria P.; Bagryanskaya, Irina Yu.; Artem’ev, Alexander V. researched the compound: Dichloro(1,5-cyclooctadiene)platinum(II)( cas:12080-32-9 ).Related Products of 12080-32-9.They published the article 《Efficient one-pot synthesis of diphenyl(pyrazin-2-yl)phosphine and its AgI, AuI and PtII complexes》 about this compound( cas:12080-32-9 ) in Mendeleev Communications. Keywords: diphenyl pyrazinylphosphine preparation crystal mol structure silver gold platinum; crystal mol structure pyrazinylphosphine silver gold platinum complex. We’ll tell you more about this compound (cas:12080-32-9).

A convenient one-pot synthesis of diphenyl(pyrazin-2-yl)phosphine has been developed based on reaction of Ph3P with metallic lithium followed by treatment of the Ph2PLi formed with 2-chloropyrazine. The AgI, AuI and PtII chloride complexes derived from this phosphine have been synthesized and structurally characterized.

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In general, if the atoms that make up the ring contain heteroatoms, such rings become heterocycles, and organic compounds containing heterocycles are called heterocyclic compounds. An article called Conjugated Macrocycles in Organic Electronics, published in 2019-04-16, which mentions a compound: 12080-32-9, Name is Dichloro(1,5-cyclooctadiene)platinum(II), Molecular C8H12Cl2Pt, SDS of cas: 12080-32-9.

This Account describes a body of research on the design, synthesis, and application of a new class of electronic materials made from conjugated macrocycles. Our macrocyclic design takes into consideration the useful attributes of fullerenes and what properties make fullerenes efficient n-type materials. We identified four electronic and structural elements: (1) a three-dimensional shape; (2) a conjugated and delocalized π-space; (3) the presence of an interior and exterior to the π-surface; and (4) low-energy unoccupied MOs allowing them to accept electrons. The macrocyclic design incorporates some of these properties, including a three-dimensional shape, an interior/exterior to the π-surface, and low-lying LUMOs maintaining the n-type semiconducting behavior, yet we also install synthetic flexibility in our approach in order to tune the properties further. Each of the macrocycles comprises perylenediimide cores wound together with linkers. The perylenediimide building block endows each macrocycle with the ability to accept electrons, while the synthetic flexibility to install different linkers allows us to create macrocycles with different electronic properties and sizes. We have created three macrocycles that all absorb well into the visible range of the solar spectrum and possess different shapes and sizes. We then use these materials in an array of applications that take advantage of their ability to function as n-type semiconductors, absorb in the visible range of the solar spectrum, and possess intramol. cavities. This Account will discuss our progress in incorporating these new macrocycles in organic solar cells, organic photodetectors, organic field effect transistors, and sensors. The macrocycles outperform acyclic controls in organic solar cells. We find the more rigid macrocyclic structure results in less intrinsic charges and lower dark current in organic photodetectors. Our macrocyclic-based photodetector has the highest detectivity of non-fullerene acceptors. The macrocycles also function as sensors and are able to recognize nuanced differences in analytes. Perylenediimide-based fused oligomers are efficient materials in both organic solar cells and field effect transistors. We will use the oligomers to construct macrocycles for use in solar energy conversion. In addition, we will incorporate different electron-rich linkers in our cycles in an attempt to engineer the HOMO/LUMO gap further. Looking further into the future, we envision opportunities in applying these conjugated macrocycles as electronic host/guest materials, as concatenated electronic materials by threading the macrocycles with electroactive oligomers, and as a locus for catalysis that is driven by light and elec. fields.

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The preparation of ester heterocycles mostly uses heteroatoms as nucleophilic sites, which are achieved by intramolecular substitution or addition reactions. Compound: Dichloro(1,5-cyclooctadiene)platinum(II)( cas:12080-32-9 ) is researched.Recommanded Product: Dichloro(1,5-cyclooctadiene)platinum(II).Adams, Muneebah; Sullivan, Matthew P.; Tong, Kelvin K. H.; Goldstone, David C.; Hanif, Muhammad; Jamieson, Stephen M. F.; Hartinger, Christian G. published the article 《Mustards-Derived Terpyridine-Platinum Complexes as Anticancer Agents: DNA Alkylation vs. Coordination》 about this compound( cas:12080-32-9 ) in Inorganic Chemistry. Keywords: mustard terpyridine platinum complex preparation cancer DNA alkylation coordination. Let’s learn more about this compound (cas:12080-32-9).

The development of bifunctional platinum complexes with the ability to interact with DNA via different binding modes is of interest in anticancer metallodrug research. Therefore, we report platinum(II) terpyridine complexes to target DNA by coordination and/or through a tethered alkylating moiety. The platinum complexes were evaluated for their in vitro antiproliferative properties against the human cancer cell lines HCT116 (colorectal), SW480 (colon), NCI-H460 (non-small cell lung), and SiHa (cervix) and generally exhibited potent antiproliferative activity although lower than their resp. terpyridine ligands. 1H NMR spectroscopy and/or ESI-MS studies on the aqueous stability and reactivity with various small biomols., acting as protein and DNA model compounds, were used to establish potential modes of action for these complexes. These investigations indicated rapid binding of complex PtL3 to the biomols. through coordination to the Pt center, while PtL4 in addition alkylated 9-ethylguanine. PtL3 was investigated for its reactivity to the model protein hen egg white lysozyme (HEWL) by protein crystallog. which allowed identification of the Nδ1 atom of His15 as the binding site.

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The chemical properties of alicyclic heterocycles are similar to those of the corresponding chain compounds. Compound: 1-(2-Methylthiazol-4-yl)ethanone, is researched, Molecular C6H7NOS, CAS is 23002-78-0, about Synthesis of 4-acetylthiazole and its 2-carboxylic acid ethyl ester, the main research direction is acetylthiazole oxime cleavage formaldehyde; thiazole acetyl; thiazole carboxylate acetyl.Related Products of 23002-78-0.

4-Acetylthiazole (I, R = H) was prepared by treating BrCH2COCMe:NOH with P2S5 and HCONH2 to give 30% 4-acetylthiazole oxime which was treated with aqueous CH2O to give 65% I (R = H). I (R = Me, Ph) were also obtained by cleaving their oximes with CH2O. I (R = CO2Et) was prepared by thiolating Et oxamate, treating Et thiooxamate with BrCH2COCMe:NOH and cleaving the oxime with CH2O.

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