Month: April 2022

Yavari, Issa; Roberts, John D. published the article 《Nitrogen-15 nuclear magnetic resonance spectroscopy. Pyridine N-oxides and quinoline N-oxides》. Keywords: nitrogen NMR pyridine oxide; quinoline oxide nitrogen NMR; carbon NMR pyridine quinoline oxide; spin coupling nitrogen pyridine oxide.They researched the compound: 8-Hydroxyquinoline 1-oxide( cas:1127-45-3 ).Application of 1127-45-3. Aromatic heterocyclic compounds can be divided into two categories: single heterocyclic and fused heterocyclic. In addition, there is a lot of other information about this compound (cas:1127-45-3) here.

Noise-decoupled, natural-abundance 15N NMR spectra are reported for 10 pyridine N-oxides and 2 quinoline N-oxides. C-4 substituents on pyridine oxides which are capable of resonance interaction with the N-O moiety, gave fairly large shifts in the expected directions. Chem. shifts determined in DMSO are 5-20 ppm and 33-55 ppm downfield from those in CF3CH2OH and CF3CO2H, resp. Solvent effects are discussed in terms of H bonding and protonation of the N-oxide O atom. 13C chem. shifts and 1-bond C-H coupling constants of some substituted pyridine N-oxides are reported and discussed.

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Reference:
Quinoxaline – Wikipedia,
Quinoxaline | C8H6N2 | ChemSpider

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: (S)-Propane-1,2-diamine dihydrochloride, is researched, Molecular C3H12Cl2N2, CAS is 19777-66-3, about Cold Crystallization of Chiral Schiff-Base Nickel(II) Complex Having Alkyl Chains and a Characteristic Methyl Group.Product Details of 19777-66-3.

Mols. exhibiting cold crystallization, an exothermic phenomenon in heating following supercooling, can be used as a heat storing material. However, examples in nonpolymers are still few. A chiral Schiff-base nickel(II) complex, which had a characteristic Me group and long alkyl chains, exhibited complicated thermal behavior including cold crystallization The Me group was a steric barrier to dimerization and mol. stacking, leading to the supercooled state. The thermal behavior of enantiomer was different from that of racemate.

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Reference:
Quinoxaline – Wikipedia,
Quinoxaline | C8H6N2 | ChemSpider

The chemical properties of alicyclic heterocycles are similar to those of the corresponding chain compounds. Compound: (R)-2,2′,6,6′-Tetramethoxy-4,4′-bis(diphenylphosphino)-3,3′-bipyridine, is researched, Molecular C38H34N2O4P2, CAS is 221012-82-4, about Extensive re-investigations of pressure effects in rhodium-catalyzed asymmetric hydrogenations, the main research direction is pressure effect rhodium catalysis asym hydrogenation.Recommanded Product: 221012-82-4.

The catalytic hydrogenation of three prochiral substrates Me Z-α-acetamidocinnamate (MAC), Me 2-acetamidoacrylate (M-Acrylate) and Et 4-methyl-3-acetamido-2-propanoate (E-EMAP) with rhodium precursors complexed with chiral diphosphines is reported at 1-30 bar hydrogen pressure. A library of 56 chiral diphosphines, including 23 BINAP derivatives, 7 JOSIPHOS, 5 BIPHEP, 3 DUPHOS derivatives, and 18 other ligands, was used. While it was generally accepted that high hydrogen pressure would result in lower ees, it is now demonstrated on a statistical basis that an equivalent distribution between beneficial and detrimental pressure effects on ee prevails and that the hydrogen pressure effect on enantioselectivity is not an isolated phenomenon since more than 33% of the reaction systems studied are strongly affected. In some case, the enantioselectivity can be improved up to 97% just by applying a higher hydrogen pressure. Extension of these conclusions to other non-chiral reagents is proposed.

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Reference:
Quinoxaline – Wikipedia,
Quinoxaline | C8H6N2 | ChemSpider

Safety of Nickel(ii)fluoridetetrahydrate. 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. Compound: Nickel(ii)fluoridetetrahydrate, is researched, Molecular F2H8NiO4, CAS is 13940-83-5, about A comparison of different spectrometers and charge corrections used in x-ray photoelectron spectroscopy.

The binding energies of the most intense ESCA lines of 16 substances were measured using the following spectrometers: 2 different VIEE 15, an ESCA 3, in part a McPherson, an AEI ES 100 and a Hewlett-Packard. When taking throughout a charge correction value C 1s = 285.0 eV, the instruments provide the same results with an error of ±0.3 eV, apart from a few exceptions. A comparison between the C 1s correction and the method of evaporation of thin Au layers shows good agreement when setting Au 4f = 83.8 eV. In this case, it is important to avoid too much Au and any surface reactions.

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Reference:
Quinoxaline – Wikipedia,
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Related Products of 32717-95-6. Aromatic compounds can be divided into two categories: single heterocycles and fused heterocycles. Compound: Chloro(1,5-cyclooctadiene)copper(I) dimer, is researched, Molecular C16H16Cl2Cu2, CAS is 32717-95-6, about Vibrational spectra of 1,5-cyclooctadiene, di-μ-chlorobis[(1,5-cyclooctadiene)rhodium(I)], di-μ-chlorobis[(1,5-cyclooctadiene)copper(I)] and bis(1,5-cyclooctadiene)copper(I) perchlorate. Author is Barna, Gabriel G.; Butler, Ian S..

The vibrational spectra of 1,5-cyclooctadiene (C8H12, COD) and the Rh(I) and Cu(I) complexes, [(COD)RhCl]2, [(COD)CuCl]2 and (COD)2CuClO4, were investigated. In the liquid state, COD exists in a C2v “”tub”” configuration; the same structure is apparently also preserved in the solid at -196°. The spectra of the dimeric complexes are in accord with the known D2h mol. symmetries and assignments for the ν(C:C), ν(M-Cl) and ν(M-olefin) vibrations are proposed accordingly. The spectra of (COD)2CuClO4 indicate the presence of a non-bonded olefinic group and a 3-coordinate structure is proposed for the (COD)2Cu+ ion.

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Reference:
Quinoxaline – Wikipedia,
Quinoxaline | C8H6N2 | ChemSpider

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 Highly Enantioselective [2+2+2] Cycloaddition of Enediynes Enabled by Cobalt/Organophotoredox Cooperative Catalysis, published in 2021-08-06, which mentions a compound: 221012-82-4, Name is (R)-2,2′,6,6′-Tetramethoxy-4,4′-bis(diphenylphosphino)-3,3′-bipyridine, Molecular C38H34N2O4P2, Electric Literature of C38H34N2O4P2.

Dual cobalt and photoredox catalysis enabled [2+2+2] cycloaddition of enediynes to produce tricyclic cyclohexadienes bearing a quaternary bridgehead carbon was reported. A variety of enediynes were used, and the corresponding cyclohexadienes were obtained in good to high yields. The use of a chiral ligand, (S)-Segphos, enabled a highly enantioselective reaction allowing access to highly enantio-enriched cyclohexadienes.

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Reference:
Quinoxaline – Wikipedia,
Quinoxaline | C8H6N2 | ChemSpider

Most of the natural products isolated at present are heterocyclic compounds, so heterocyclic compounds occupy an important position in the research of organic chemistry. A compound: 19777-66-3, is researched, SMILESS is C[C@H](N)CN.[H]Cl.[H]Cl, Molecular C3H12Cl2N2Journal, Jingxi Huagong Zhongjianti called Synthesis of dexrazoxane, Author is Yu, Caixia; Yang, Yihong; Zhang, Heng; Yang, Jianshe, the main research direction is dexrazoxane synthesis diaminopropane.Product Details of 19777-66-3.

Dexrazoxane, a cardiac medicine, was synthesized in 35.7% overall yield starting from racemic 1,2-diaminopropane. The resolution of l,2-diaminopropane with D-(-)-tartaric acid followed by reaction with potassium chloride resulted in (S)-1,2-diaminopropane dihydrochloride, which was further converted into the title compound in two steps. The structure was confirmed with 1H NMR and IR.

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Reference:
Quinoxaline – Wikipedia,
Quinoxaline | C8H6N2 | ChemSpider

Category: quinoxaline. Aromatic compounds can be divided into two categories: single heterocycles and fused heterocycles. Compound: 8-Hydroxyquinoline 1-oxide, is researched, Molecular C9H7NO2, CAS is 1127-45-3, about First Safe and Practical Synthesis of 2-Amino-8-hydroxyquinoline. Author is Storz, Thomas; Marti, Roger; Meier, Roland; Nury, Patrice; Roeder, Michael; Zhang, Kesheng.

The first safe and efficient synthesis of the important building block 2-amino-8-hydroxyquinoline (1) is described. Starting from the readily available N-oxide of the cheap bulk chem. 8-hydroxyquinoline (2), the target compound is obtained in a two-step one-pot procedure in good overall yield (53-66%) and purity (>98%) on a kilogram scale without chromatog.

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Reference:
Quinoxaline – Wikipedia,
Quinoxaline | C8H6N2 | ChemSpider

Reference of (R)-2,2′,6,6′-Tetramethoxy-4,4′-bis(diphenylphosphino)-3,3′-bipyridine. 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: (R)-2,2′,6,6′-Tetramethoxy-4,4′-bis(diphenylphosphino)-3,3′-bipyridine, is researched, Molecular C38H34N2O4P2, CAS is 221012-82-4, about Polyethylene glycol as an environmentally friendly and recyclable reaction medium for enantioselective hydrogenation. Author is Zhou, Hai-Feng; Fan, Qing-Hua; Tang, Wei-Jun; Xu, Li-Jin; He, Yan-Mei; Deng, Guo-Jun; Zhao, Li-Wen; Gu, Lian-Quan; Chan, Albert S. C..

Polyethylene glycol (PEG) was found to be an inexpensive, non-toxic and recyclable reaction medium for ruthenium- and rhodium-catalyzed asym. hydrogenation of 2-arylacrylic acids (Ru-catalyzed C=C bond reduction), enamides (Rh-catalyzed C=C bond reduction), β-keto esters and simple aromatic ketones (Ru-catalyzed C=O bond reduction). In all cases, high catalytic activities and enantioselectivities have been achieved, which are comparable to those obtained in conventional organic solvent systems. The Ru and Rh catalysts prepared with com. available chiral diphosphine ligands could be readily recycled by simple extraction, as in the case of ionic liquids, and reused up to nine times without obvious loss of catalytic activity and enantioselectivity. The reduced products were obtained from the extracts in high isolated yields. These results indicate that PEGs as new reaction media are attractive alternatives to room temperature ionic liquids

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Quinoxaline – Wikipedia,
Quinoxaline | C8H6N2 | ChemSpider

The reaction of an aromatic heterocycle with a proton is called a protonation. One of articles about this theory is 《Nuclear magnetic resonance study of some paramagnetic hydrated fluorides》. Authors are Easwaran, K. R. K.; Srinivasan, R..The article about the compound:Nickel(ii)fluoridetetrahydratecas:13940-83-5,SMILESS:[H]O[H].[H]O[H].[H]O[H].[H]O[H].[Ni+2].[F-].[F-]).Application of 13940-83-5. Through the article, more information about this compound (cas:13940-83-5) is conveyed.

A preliminary study of 1H and 19F in compounds of the type MF2.4H2O (M = Mn, Fe, Co, Ni, Zn) was carried out (at room temperature and 90°K.), to investigate the nature of the hyperfine interaction. The samples were prepared by dissolving the carbonates (except in the case of Fe, where pure Fe powder was used) in 40% HF and precipitating with EtOH. The Fe compound was not very stable, and was kept in vacuo. X-ray powder photographs revealed the Fe, Co, Ni, and Zn salts to be isomorphous. For the 1H resonance, an increase in line width at low temperatures is attributed to the increase in the electronic polarization. The 19F fractional shift, α, increased through the Ni++, Co++, Fe++ series (increasing number of unpaired spins) at room temperature This order was not preserved at lower temperatures Paramagnetic susceptibilities were also measured at room temperature by the Gouy method.

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Reference:
Quinoxaline – Wikipedia,
Quinoxaline | C8H6N2 | ChemSpider