Day: April 7, 2022

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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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 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,
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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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Quinoxaline – Wikipedia,
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Yu, Bing; Menard, Frederic; Isono, Naohiro; Lautens, Mark published an article about the compound: (R)-2,2′,6,6′-Tetramethoxy-4,4′-bis(diphenylphosphino)-3,3′-bipyridine( cas:221012-82-4,SMILESS:COC(C=C1P(C2=CC=CC=C2)C3=CC=CC=C3)=NC(OC)=C1C4=C(OC)N=C(OC)C=C4P(C5=CC=CC=C5)C6=CC=CC=C6 ).Recommanded Product: (R)-2,2′,6,6′-Tetramethoxy-4,4′-bis(diphenylphosphino)-3,3′-bipyridine. Aromatic heterocyclic compounds can be classified according to the number of heteroatoms or the size of the ring. The authors also want to convey more information about this compound (cas:221012-82-4) through the article.

A highly enantioselective allylic substitution of (Z)-but-2-ene-1,4-diol derivatives was developed using a Rh(I) catalyst and arylboronates as nucleophiles. The reaction yields versatile homoallylic alcs. from readily available linear bis-carbonates.

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Quinoxaline – Wikipedia,
Quinoxaline | C8H6N2 | ChemSpider

Related Products of 217192-22-8. The mechanism of aromatic electrophilic substitution of aromatic heterocycles is consistent with that of benzene. Compound: (4-(Pyridin-4-yl)phenyl)methanol, is researched, Molecular C12H11NO, CAS is 217192-22-8, about Colour coding the co-conformations of a [2]rotaxane flip-switch. Author is Suhan, Natalie D.; Allen, Laura; Gharib, Mireille T.; Viljoen, Elizabeth; Vella, Sarah J.; Loeb, Stephen J..

Fine-tuning the charge transfer chromophores in a series of [2]rotaxane flip-switches yields a unique optical signal (purple color) for one of the interactions allowing for facile determination of the position of the flip-switch equilibrium

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Quinoxaline – Wikipedia,
Quinoxaline | C8H6N2 | ChemSpider

Related Products of 13940-83-5. The protonation of heteroatoms in aromatic heterocycles can be divided into two categories: lone pairs of electrons are in the aromatic ring conjugated system; and lone pairs of electrons do not participate. Compound: Nickel(ii)fluoridetetrahydrate, is researched, Molecular F2H8NiO4, CAS is 13940-83-5, about Mechanism of film formation on nickel anodes in a molten NH4F.2HF. Author is Tasaka, A.; Tsukuda, Y.; Yamada, S.; Matsushita, K.; Kohmura, A.; Muramatsu, N.; Takebayashi, H.; Mimaki, T..

The mechanism of film formation on the Ni anode in a well dehydrated melt of NH4F.2HF was studied at 1000C. The potentiodynamic and potentiostatic polarization behaviors of the Ni anode were studied to elucidate the anodic processes. The oxidized layer was composed of NiF2 with a small amount of nickel oxides such as NiO and Ni2O3 or oxyfluorides having plural oxidation states and a highly oxidized nickel fluoride formed on the Ni anode polarized at potentials >4.5 V vs. H2 and it grew thicker through the repetition of the alternate formation and degradation with the time of electrolysis. The composition and the thickness of the oxidized layer may reflect on the c.d. on the nickel anode under polarization.

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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: 8-Hydroxyquinoline 1-oxide, is researched, Molecular C9H7NO2, CAS is 1127-45-3, about New Ligands That Promote Cross-Coupling Reactions between Aryl Halides and Unactivated Arenes, the main research direction is aminoquinolinecarboxylic acid preparation ligand coupling reaction aryl halide arene.Application In Synthesis of 8-Hydroxyquinoline 1-oxide.

Several ligands were designed to promote transition-metal-free cross-coupling reactions of aryl halides with benzene derivatives Among the systems probed, quinoline-1-amino-2-carboxylic acid was found to serve as an excellent catalyst for cross-coupling between aryl halides and unactivated benzene. Reactions using this inexpensive catalytic system displayed a high functional group tolerance as well as excellent chemoselectivities.

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Quinoxaline – Wikipedia,
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Application of 217192-22-8. Aromatic compounds can be divided into two categories: single heterocycles and fused heterocycles. Compound: (4-(Pyridin-4-yl)phenyl)methanol, is researched, Molecular C12H11NO, CAS is 217192-22-8, about Structural Characterization and Ligand/Inhibitor Identification Provide Functional Insights into the Mycobacterium tuberculosis Cytochrome P450 CYP126A1. Author is Chenge, Jude T.; Van Duyet, Le; Swami, Shalini; McLean, Kirsty J.; Kavanagh, Madeline E.; Coyne, Anthony G.; Rigby, Stephen E. J.; Cheesman, Myles R.; Girvan, Hazel M.; Levy, Colin W.; Rupp, Bernd; von Kries, Jens P.; Abell, Chris; Leys, David; Munro, Andrew W..

The Mycobacterium tuberculosis H37Rv genome encodes 20 cytochromes P 450, including P450s crucial to infection and bacterial viability. Many M. tuberculosis P450s remain uncharacterized, suggesting that their further anal. may provide new insights into M. tuberculosis metabolic processes and new targets for drug discovery. CYP126A1 is representative of a P 450 family widely distributed in mycobacteria and other bacteria. Here we explore the biochem. and structural properties of CYP126A1, including its interactions with new chem. ligands. A survey of azole antifungal drugs showed that CYP126A1 is inhibited strongly by azoles containing an imidazole ring but not by those tested containing a triazole ring. To further explore the mol. preferences of CYP126A1 and search for probes of enzyme function, we conducted a high throughput screen. Compounds containing three or more ring structures dominated the screening hits, including nitroarom. compounds that induce substrate-like shifts in the heme spectrum of CYP126A1. Spectroelectrochem. measurements revealed a 155-mV increase in heme iron potential when bound to one of the newly identified nitroarom. drugs. CYP126A1 dimers were observed in crystal structures of ligand-free CYP126A1 and for CYP126A1 bound to compounds discovered in the screen. However, ketoconazole binds in an orientation that disrupts the BC-loop regions at the P 450 dimer interface and results in a CYP126A1 monomeric crystal form. Structural data also reveal that nitroarom. ligands “”moonlight”” as substrates by displacing the CYP126A1 distal water but inhibit enzyme activity. The relatively polar active site of CYP126A1 distinguishes it from its most closely related sterol-binding P450s in M. tuberculosis, suggesting that further investigations will reveal its diverse substrate selectivity.

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Quinoxaline – Wikipedia,
Quinoxaline | C8H6N2 | ChemSpider

Ng, Christina; Sabat, Michal; Fraser, Cassandra L. published the article 《Metal Complexes with Cis α Topology from Stereoselective Quadridentate Ligands with Amine, Pyridine, and Quinoline Donor Groups》. Keywords: crystal structure copper bispentafluorophenylbismethylpyridyldiazahexane chloro; transition metal ethylenediamine propylenediamine quadridentate derivative preparation; diastereomer transition metal quadridentate polyamine preparation; stereoselective quadridentate polyamine metal complex diastereomer; oxidation potential transition metal quadridentate polyamine; topol stereoselective transition metal quadridentate polyamine.They researched the compound: (S)-Propane-1,2-diamine dihydrochloride( cas:19777-66-3 ).Formula: C3H12Cl2N2. 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:19777-66-3) here.

Though the principles governing quadridentate topol. and metal stereochem. were known for some time, the cis α topol. was little exploited in designing catalysts for asym. reactions. Study of the inorganic chem. of labile metal cis α complexes was undertaken as a prelude to exploring their potential to serve as catalysts for a variety of different reactions. The synthesis of 1st row transition metal complexes of quadridentate ligands with ethylenediamine (en) and S-propylenediamine (S-pn) backbones that were alkylated at N with either pyridine (py) or quinoline (qn) donor groups as well as with noncoordinating benzyl (Bn) or pentafluorobenzyl (F5Bn) groups was undertaken. The steric and electronic properties vary throughout the ligand series, en(Bn)py, 1, en(F5Bn)py, 2, S-pn(F5Bn)py, 3, and S-pn(F5Bn)qn, 4. These ligands were reacted with MCln salts (n = 2, M = Mn, Fe, Co, Ni, Cu, Zn; n = 3, M = Fe) to generate, in most cases, octahedral complexes with the targeted cis α topol. UV/visible, NMR, IR, cyclic voltammetry (CV), and conductivity anal. are described for the metal compounds x-ray structural anal. of [Cu{en(F5Bn)py}Cl]Cl reveals a five coordinate square pyramidal geometry. Single or major diastereomers were obtained for all diamagnetic Zn(II) complexes as well as for Co(III) analogs that were prepared by oxidation of Co(II) species using Br2 as the oxidant. Electronic differences among ligands are reflected in the oxidation potentials of the resp. metal complexes as determined by CV, with fluorinated systems showing greater resistance to oxidation, as expected.

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Reference:
Quinoxaline – Wikipedia,
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