Day: April 2, 2022

The reaction of an aromatic heterocycle with a proton is called a protonation. One of articles about this theory is 《Application of unithiol (Na 2,3-dimercaptopropanesulfonate) in analytical chemistry》. Authors are Vol’f, A. L..The article about the compound:8-Hydroxyquinoline 1-oxidecas:1127-45-3,SMILESS:OC1=CC=CC2=CC=C[N+]([O-])=C12).Computed Properties of C9H7NO2. Through the article, more information about this compound (cas:1127-45-3) is conveyed.

Unithiol (I) (cf. Ptrun’kin, CA 51, 5692h) forms stable complexes with many cations and most of these are soluble in H2O. Zn and Cd were determined by titration with I in the presence of Eriochrome Black T as an indicator with the same degree of accuracy as by titration with Trilon B; alkali metals and Fe up to 5 mg./l. did not interfere. I can be used to block the interference of Zn, Pb, and Hg in the trilonometric determination of Ca and Mg. I forms complexes with the following cations: in neutral media; Pb green, Cu blue, Ni brown, and Bi yellow; in acid media; Cu dark-blue, Ag green, and Mn brown; in NH4OH; Cu blue-violet, Fe red, Ag green, Mn brown-green, Bi yellow, and Sb yellow.

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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, Tetrahedron: Asymmetry called Enantiomeric impurities in chiral catalysts, auxiliaries, synthons and resolving agents. Part 2, Author is Armstrong, Daniel W.; He, Lingfeng; Yu, Timothy; Lee, Jauh T.; Liu, Yan-song, the main research direction is enantiomeric purity chiral catalyst auxiliary synthon resolving agent.Reference of (S)-Propane-1,2-diamine dihydrochloride.

The enantiomeric purity of reagents used in asym. synthesis is of fundamental importance when evaluating the selectivity of a reaction and the product purity. In this work, 109 chiral reagents (many recently introduced) are assayed. Approx. 64% of these reagents had moderate to high levels of enantiomeric impurities (i.e. from >0.1% to <16%). The type of chiral reagents assayed and used in enantioselective synthesis include metal-ligand catalysts for allylic substitutions, catalysts for addition of Grignard reagents and other additions, epoxidations and reduction of ketones and aldehydes; Ru-complex auxiliaries for asym. cyclopropanation, as well as amine, diamine, alc., diol, amino alc., carboxylic acid and oxazolidinone auxiliaries; epoxide, lactone, furanone, pyrrolidinone, nitrile, sulfoximine and carboxylic acid synthons (including malic acid, mandelic acid, lactic acid and tartaric acid); and a variety of chiral resolving agents. Accurate, efficient assays for all compounds are given. If you want to learn more about this compound((S)-Propane-1,2-diamine dihydrochloride)Reference of (S)-Propane-1,2-diamine dihydrochloride, you may wish to communicate with the author of the article,or consult the relevant literature related to this compound(19777-66-3).

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Quinoxaline – Wikipedia,
Quinoxaline | C8H6N2 | ChemSpider

Name: (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 Extensive re-investigations of pressure effects in rhodium-catalyzed asymmetric hydrogenations. Author is Alame, Mohamad; Pestre, Nathalie; de Bellefon, Claude.

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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Quinoxaline – Wikipedia,
Quinoxaline | C8H6N2 | ChemSpider

The preparation of ester heterocycles mostly uses heteroatoms as nucleophilic sites, which are achieved by intramolecular substitution or addition reactions. Compound: 8-Hydroxyquinoline 1-oxide( cas:1127-45-3 ) is researched.Name: 8-Hydroxyquinoline 1-oxide.de la Guardia, Carolina; Stephens, David E.; Dang, Hang T.; Quijada, Mario; Larionov, Oleg V.; Lleonart, Ricardo published the article 《Antiviral activity of novel quinoline derivatives against dengue virus serotype 2》 about this compound( cas:1127-45-3 ) in Molecules. Keywords: dengue virus serotype 2 Vero cell quinoline derivative antiviral; antiviral; dengue virus; quinolines. Let’s learn more about this compound (cas:1127-45-3).

Dengue virus causes dengue fever, a debilitating disease with an increasing incidence in many tropical and subtropical territories. So far, there are no effective antivirals licensed to treat this virus. Here we describe the synthesis and antiviral activity evaluation of two compounds based on the quinoline scaffold, which has shown potential for the development of mols. with various biol. activities. Two of the tested compounds showed dose-dependent inhibition of dengue virus serotype 2 in the low and sub micromolar range. The compounds 1 and 2 were also able to impair the accumulation of the viral envelope glycoprotein in infected cells, while showing no sign of direct virucidal activity and acting possibly through a mechanism involving the early stages of the infection. The results are congruent with previously reported data showing the potential of quinoline derivatives as a promising scaffold for the development of new antivirals against this important virus.

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Quinoxaline – Wikipedia,
Quinoxaline | C8H6N2 | ChemSpider

Shrader, William D.; Celebuski, Joseph; Kline, Steven J.; Johnson, David published an article about the compound: 8-Hydroxyquinoline 1-oxide( cas:1127-45-3,SMILESS:OC1=CC=CC2=CC=C[N+]([O-])=C12 ).COA of Formula: C9H7NO2. 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:1127-45-3) through the article.

Tris[[(hydroxyquinoline)carbonamido]ethyl]amine (I), a new hexadentate chelator, was prepared by the conversion of 8-hydroxyquinoline to succinimido hydroxyquinolinecarboxylate II and subsequent reaction with N(CH2CH2NH2)3. I is a siderophore analog with a non-naturally occurring binding unit comprising a combination of both O and N donor atoms.

If you want to learn more about this compound(8-Hydroxyquinoline 1-oxide)COA of Formula: C9H7NO2, you may wish to communicate with the author of the article,or consult the relevant literature related to this compound(1127-45-3).

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Quinoxaline – Wikipedia,
Quinoxaline | C8H6N2 | ChemSpider

Name: 8-Hydroxyquinoline 1-oxide. The reaction of aromatic heterocyclic molecules with protons is called protonation. Aromatic heterocycles are more basic than benzene due to the participation of heteroatoms. Compound: 8-Hydroxyquinoline 1-oxide, is researched, Molecular C9H7NO2, CAS is 1127-45-3, about Transition-Metal-Free Regioselective Alkylation of Quinoline N-Oxides via Oxidative Alkyl Migration and C-C Bond Cleavage of tert-/sec-Alcohols. Author is Sen, Chiranjit; Ghosh, Subhash C..

An unprecedented C2-alkylation of quinoline N-oxide derivatives I [R1 = Me, Et; R2 = H, OH, HNC(O)Ph, etc.; R3 = H, 6-Me, 5-Br, etc.] via C-C bond activation of tert- and sec-alkyl alc. was described using hypervalent iodine (III) reagent PhI(OAc)2 (PIDA). This regioselective alkylation using mild hypervalent iodine reagents was more practical, operationally simple and transition metal-free. The reaction proceeded efficiently with a broad range of substrates including quinoline, isoquinoline, and pyridine N-oxides using a variety of tert-/sec- alcs. to afford compounds I, alkyl-benzo[h]quinoline-N-oxides, alkyl-pyridine-N-oxides and alkyl-isoquinoline-N-oxides. From exptl. outcome, a rationalized mechanism was proposed, mediated by PIDA.

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Quinoxaline – Wikipedia,
Quinoxaline | C8H6N2 | ChemSpider

Computed Properties of C9H11Br. 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: 1-(Bromomethyl)-4-ethylbenzene, is researched, Molecular C9H11Br, CAS is 57825-30-6, about Copper(I)-Catalyzed Asymmetric Alkylation of Unsymmetrical Secondary Phosphines. Author is Zhang, Shuai; Xiao, Jun-Zhao; Li, Yan-Bo; Shi, Chang-Yun; Yin, Liang.

A Cu(I)-catalyzed asym. alkylation of HPAr1Ar2 with alkyl halides is uncovered, which provides an array of P-stereogenic phosphines in generally high yield and enantioselectivity. The electrophilic alkyl halides enjoy a broad substrate scope, including allyl bromides, propargyl bromide, benzyl bromides, and alkyl iodides. Also, 11 unsym. diarylphosphines (HPAr1Ar2) serve as competent pronucleophiles. The present methodol. is also successfully applied to catalytic asym. double and triple alkylation, and the corresponding products were obtained in moderate diastereo- and excellent enantioselectivities. Some 31P NMR experiments indicate that bulky HPPhMes exhibits weak competitively coordinating ability to the Cu(I)-bisphosphine complex, and thus the presence of stoichiometric HPAr1Ar2 does not affect the enantioselectivity significantly. Therefore, the high enantioselectivity in this reaction is attributed to the high performance of the unique Cu(I)-(R,RP)-TANIAPHOS complex in asym. induction. Finally, one monophosphine and two bisphosphines prepared by the present reaction are employed as efficient chiral ligands to afford three structurally diversified Cu(I) complexes, which demonstrates the synthetic utility of the present methodol.

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Quinoxaline – Wikipedia,
Quinoxaline | C8H6N2 | ChemSpider

Most of the compounds have physiologically active properties, and their biological properties are often attributed to the heteroatoms contained in their molecules, and most of these heteroatoms also appear in cyclic structures. A Journal, Advanced Synthesis & Catalysis called Highly Enantioselective Hydrogenation of Quinoline and Pyridine Derivatives with Iridium-(P-Phos) Catalyst, Author is Tang, Wei-Jun; Tan, Jing; Xu, Li-Jin; Lam, Kim-Hung; Fan, Qing-Hua; Chan, Albert S. C., which mentions a compound: 221012-82-4, SMILESS is 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, Molecular C38H34N2O4P2, HPLC of Formula: 221012-82-4.

The use of a chiral iridium catalyst generated in situ from the (cyclooctadiene)iridium chloride dimer, [Ir(COD)Cl]2, the P-Phos ligand [4,4′-bis(diphenylphosphino)-2,2′,6,6′-tetramethoxy-3,3′-bipyridine] and iodine for the asym. hydrogenation of 2,6-substituted quinolines and 2-substituted 7,8-dihydroquinolin-5(6H)-ones is reported. The catalyst worked efficiently to hydrogenate a series of quinoline derivatives to provide chiral 1,2,3,4-tetrahydroquinolines in high yields and up to 96% ee. The hydrogenation was carried out at high S/C (substrate to catalyst) ratios of 2000-50000, reaching up to 4000 h-1 TOF (turnover frequency) and up to 43000 TON (turnover number). The catalytic activity is found to be additive-controlled. At low catalyst loadings, decreasing the amount of additive I2 was necessary to maintain the good conversion. The same catalyst system could also enantioselectively hydrogenate 2-substituted 7,8-dihydroquinolin-5(6H)-ones, affording the chiral hexahydroquinolinone derivatives in nearly quant. yields and up to 99% ee. Interestingly, increasing the amount of I2 favored high reactivity and enantioselectivity in this case. The high efficacy and enantioselectivity enable the present catalyst system of high practical potential.

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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: 32717-95-6, is researched, SMILESS is C12=C(CCC3=C4CC2)[Cu+]1534[Cl-][Cu+]678(C9=C6CCC7=C8CC9)[Cl-]5, Molecular C16H16Cl2Cu2Journal, Journal of Organometallic Chemistry called Copper(I) complexes with the hexaazafulleroid C60(NR)6, derived from (2S,4S)-4-azido-1-benzyloxycarbonyl-2-(t-butylaminocarbonyl)pyrrolidine as multitopic ligand. Catalytic properties in oxidation of sulfides, Author is Iglesias, M.; Gomez-Lor, B.; Santos, A., the main research direction is copper hexaazafulleroid pyrrolidinecarboxamide preparation sulfide oxidation catalyst; pyrrolidinecarboxylate hexaazafulleroid copper preparation sulfide oxidation catalyst; azafulleroid pyrrolidinecarboxamide copper preparation sulfide oxidation catalyst; fulleroid pyrrolidinecarboxamide copper preparation sulfide oxidation catalyst; fullerene pyrrolidinecarboxamide copper preparation sulfide oxidation catalyst.Name: Chloro(1,5-cyclooctadiene)copper(I) dimer.

Reactions in a molar ratio 1:6 of the hexaazafulleroid C60(NR)6 (1), derived from the chiral azide (2S,4S)-4-azido-1-benzyloxycarbonyl-2-(t-butylaminocarbonyl)pyrrolidine (2), with the copper(I) complexes [Cu(MeCN)4]ClO4 and [CuCl(cod)]2 (cod = 1,5-cyclooctadiene) lead to the polymetalated species C60[(NR)Cu(MeCN)2(ClO4)]6 (3) and C60[(NR)CuCl(cod)]6·2CuCl (4), resp., which were characterized by IR, 1H- and 13C-NMR spectroscopies and by mass spectrometry techniques (ES-, FAB- and MALDI-MS). The performance of both complexes as catalysts in the oxidation of alkyl Ph sulfides [methyl Ph sulfide, (2-ethylbutyl) Ph sulfide] was evaluated.

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Reference:
Quinoxaline – Wikipedia,
Quinoxaline | C8H6N2 | ChemSpider

The three-dimensional configuration of the ester heterocycle is basically the same as that of the carbocycle. Compound: (R)-2,2′,6,6′-Tetramethoxy-4,4′-bis(diphenylphosphino)-3,3′-bipyridine(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,cas:221012-82-4) is researched.Product Details of 75732-01-3. The article 《3,3′-Bipyridine, 4,4′-bis(diphenylphosphino)-2,2′,6,6′-tetramethoxy-, (3R)-; 3,3′-Bipyridine, 4,4′-bis(diphenylphosphino)-2,2′,6,6′-tetramethoxy-, (3S)-》 in relation to this compound, is published in e-EROS Encyclopedia of Reagents for Organic Synthesis. Let’s take a look at the latest research on this compound (cas:221012-82-4).

Properties and applications of 3,3′-bipyridine, 4,4′-bis(diphenylphosphino)-2,2′,6,6′-tetramethoxy-, (3R)-; 3,3′-bipyridine, 4,4′-bis(diphenylphosphino)-2,2′,6,6′-tetramethoxy-, (3S)-, a chiral biaryl bisphosphine ligands used for high activity and selectivity in catalytic hydrogenation of ketones, β-ketoesters, α,β-unsaturated carbonyl compounds, quinolines; transfer hydrogenation, Pauson-Khand-type reactions, carbonylation and other reductions are reviewed.

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Reference:
Quinoxaline – Wikipedia,
Quinoxaline | C8H6N2 | ChemSpider