Day: April 20, 2022

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 Structure-based design, synthesis, and antimicrobial activity of purine derived SAH/MTA nucleosidase inhibitors, published in 2004-06-21, which mentions a compound: 217192-22-8, Name is (4-(Pyridin-4-yl)phenyl)methanol, Molecular C12H11NO, Application of 217192-22-8.

The structure-based design, synthesis, and biol. activity of novel inhibitors of S-adenosyl homocysteine/methylthioadenosine (SAH/MTA) nucleosidase are described. Using 6-substituted purine and deaza purines as the core scaffolds, a systematic and structure guided series of modifications provided low nM inhibitors with broad-spectrum antimicrobial activity.

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Reference:
Quinoxaline – Wikipedia,
Quinoxaline | C8H6N2 | ChemSpider

Safety of (S)-Propane-1,2-diamine dihydrochloride. The mechanism of aromatic electrophilic substitution of aromatic heterocycles is consistent with that of benzene. Compound: (S)-Propane-1,2-diamine dihydrochloride, is researched, Molecular C3H12Cl2N2, CAS is 19777-66-3, about β-PNA: Peptide nucleic acid (PNA) with a chiral center at the β-position of the PNA backbone. Author is Sugiyama, Toru; Imamura, Yasutada; Demizu, Yosuke; Kurihara, Masaaki; Takano, Masashi; Kittaka, Atsushi.

Peptide nucleic acid (PNA) monomers with a Me group at the β-position have been synthesized. The modified monomers were incorporated into PNA oligomers using Fmoc chem. for solid-phase synthesis. Thermal denaturation and CD studies have shown that PNA containing the S-form monomers was well suited to form a hybrid duplex with DNA, whose stability was comparable to that of unmodified PNA-DNA duplex, whereas PNA containing the R-form monomers was not.

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Reference:
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-]).Computed Properties of F2H8NiO4. 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

COA of Formula: C7H5ClN4. Aromatic compounds can be divided into two categories: single heterocycles and fused heterocycles. Compound: 4-Chloro-6-(1H-imidazol-1-yl)pyrimidine, is researched, Molecular C7H5ClN4, CAS is 114834-02-5, about Selective mono-amination of dichlorodiazines. Author is Sengmany, Stephane; Lebre, Julie; Le Gall, Erwan; Leonel, Eric.

3,6-Dichloropyridazine, 4,6-dichloropyrimidine, 2,4-dichloropyrimidine, and 3,5-dichloropyridazine underwent chemoselective monosubstitution reactions with amines using triethylamine as a base in ethanol at either ambient temperature or reflux to give monoamino monochloro pyridazines and pyrimidines. The methodol. is general and efficient despite noticeable differences in reactivity between diazines; while dichloropyridazine and dichloropyrazine require several hours of heating at reflux for the reaction to proceed, dichloropyrimidines reach completion within minutes at room temperature

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Reference:
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 《Heterocyclic N-oxides. III. 8-Hydroxyquinoline N-oxide》. Authors are Ramaiah, K.; Srinivasan, V. R..The article about the compound:8-Hydroxyquinoline 1-oxidecas:1127-45-3,SMILESS:OC1=CC=CC2=CC=C[N+]([O-])=C12).Name: 8-Hydroxyquinoline 1-oxide. Through the article, more information about this compound (cas:1127-45-3) is conveyed.

cf. CA 57, 6761f. Unlike 8-hydroxyquinoline (I), the title compound (II) shows no OH stretching at 3400 or 3660 cm.-1, Badger and Moritz (CA 53, 11382g). The broad medium-intensity band of II at 2857-2440 cm.-1 is independent of concentration and is interpreted as evidence of strong intramol. H bonding involving the O-H and N-O groups. Preliminary study by the method of Irving, et al. (CA 43, 8941i) with 23 cations indicates that II chelates more selectively than I. The results at pH 5.2, 8.4, and 12.4 are tabulated. II is conveniently prepared in fair yield by heating (water bath, 65-75°) 14.5 g. I in 30 ml. glacial HOAc with 10 ml. 30% H2O2. At intervals of 1 hr. a total of 30 ml. more of H2O2 was added in 3 equal increments. The mixture was concentrated in vacuo, made alk. with saturated aqueous Na2CO3, and left overnight after addition of 60 ml. CHCl3. Unreacted I was removed by steam distillation of the mixture after filtration, drying and removal of CHCl3 by distillation Hot filtration of the aqueous residue gave on cooling 5.96 g. yellow needles of II, m. 139°.

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Reference:
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 《Mechanism of aromatic side-chain reactions with special reference to the polar effects of substituents. IV. The mechanism of quaternary salt formation》. Authors are Baker, John W.; Nathan, Wilfred S..The article about the compound:1-(Bromomethyl)-4-ethylbenzenecas:57825-30-6,SMILESS:CCC1=CC=C(CBr)C=C1).Formula: C9H11Br. Through the article, more information about this compound (cas:57825-30-6) is conveyed.

cf. C. A. 29, 4657.5. The following data are given for the reaction of RC6H4CH2Br with C5H5N in dry Me2CO at the temperatures given, where R is: p-Me, 20°, 2.020 (kp × 104, g.-mol./l./sec.); 40°, 7.983; p-Et, 20°, 1.811; 30°, 3.517; 40°, 6.733; p-iso-Pr, 20°, 1.633; 40°, 6.500; p-tert-Bu, 20°, 1.652; 30°, 3.357; 40°, 6.467; 2,4-Me2, 20°, 6.287; 30°, 12.48; 40°, 24.05; 2,4-(NO2)2, 20°, 2.288; 30°, 4.700; 40°, 8.960. The results show that the small retarding effect of a p-NO2 group is replaced by an accelerating effect when a 2nd NO2 group is introduced into the 2-position. In a series of substituents arranged in order of decreasing +I or increasing -I effects, a min. velocity is found with the p-NO2 compound: 2,4-Me2 > (p-tert-Bu < p-iso-Pr < p-Et < p-Me) > H > p-NO2 ≪ 2,4-(NO2)2. The position of the 2,4-(NO2)2 group illustrates a new phenomenon, viz., the occurrence of a min. velocity in a graded polar series without change in reaction kinetics. The interaction of the 2,4-dinitrobenzyl bromide with C5H5N is strictly bimol., the velocity coefficient in Me2CO at 40° being independent of the concentration The accelerating effect of the 2,4-(NO2)2 groups observed in dry Me2CO is almost absent in aqueous 90% Me2CO and becomes a retarding effect in aqueous 90% EtOH. The results thus far show (1) the reaction between benzyl halides and tert-bases in non-aqueous media is strictly bimol. and involves a simultaneous addition and dissociation; the Arrhenius energy of activation E is, within exptl. error, unaffected by substituents and is closely related to the energy changes involved in the electron cycle as a whole; the velocity of the reaction, as affected by substituent groups in the aryl bromide, is determined mainly by some factor which is incorporated in the term P of the equation kp = PZe-E/RT; electron accession toward the side chain (+I effect) increases the reaction velocity; up to a point (at p-NO2), decrease of electron availability in the side chain decreases the velocity, but greater electron recession (in 2,4-(NO2)2) from the side chain to the nucleus reverses this effect and greatly increases the velocity. 2,4-Dinitrobenzylpyridinium bromide, m. 196° (decomposition). p-Ethylbenzyl bromide, b0.8 84°, m. 14.5-5.2°, from the chloride and NaBr in 90% aqueous Me2CO; iso-Pr homolog, b0.4 75°; tert-Bu homolog, b0.3 99°, m. 15.1°; 2,4-dimethylbenzyl bromide, b1.2 79°, m. 15°.

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Reference:
Quinoxaline – Wikipedia,
Quinoxaline | C8H6N2 | ChemSpider

Hsu, Fu-Lian; Hamada, Akihiko; Booher, Mark E.; Fuder, H.; Patil, P. N.; Miller, Duane D. published the article 《Optically active derivatives of imidazolines. α-Adrenergic blocking properties》. Keywords: imidazoline stereoisomer preparation adrenergic blocker.They researched the compound: (S)-Propane-1,2-diamine dihydrochloride( cas:19777-66-3 ).Computed Properties of 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.

The title compounds I (R and R1 = H, Me, or PhCH2; R2 = 1-naphthylmethyl, PhCH2, or 2,6-dichloroaniline) as salts were prepared from an optically active 1,2-diamine-2HCl and an imino ester HCl, and converted to a stable solid salt. I were evaluated for α-adrenergic activity on rabbit aortic strips. Compared to naphazoline or tolazoline, substitution of a Me or PhCH2 at the 4 position of the imidazoline ring resulted in moderate α-blocking activity with no apparent stereoselectivity with such substitution.

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Reference:
Quinoxaline – Wikipedia,
Quinoxaline | C8H6N2 | ChemSpider

Application In Synthesis 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 The mass attenuation coefficients in some vanadium and nickel compounds.

The mass attenuation coefficients for V2O3, VO2, VF3, NH4VO3, VF4, NiF2, NiCl2, NiCl2.H2O, NiF2.4H2O, NiCl2.6H2O, Ni(ClO4)2.6H2O were measured at x-ray energies 15.746-40.930 keV using a Si(Li) detector. The measured values are compared with the theor. ones calculated using WinXcom.

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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: 1-(Bromomethyl)-4-ethylbenzene, is researched, Molecular C9H11Br, CAS is 57825-30-6, about Synthesis and biological studies of novel 2-(4-substitutedbenzylthio)-5-amino-6-(benzo[d]thiazol-2-yl)-7-(4-chlorophenyl)pyrido[2,3-d]pyrimidin-4(3H)-one derivatives.Electric Literature of C9H11Br.

A series of novel 2-(4-substitutedbenzylthio)-5-amino-6-(benzo[d]thiazol-2-yl)-7-(4-chlorophenyl)pyrido[2,3-d]pyrimidin-4(3H)-one derivatives were synthesized and evaluated for their antibacterial and antifungal activity. All the derivatives were efficiently synthesized in four steps. The structure of the newly synthesized compounds was elucidated by their IR, 1H-NMR, 13C NMR, LCMS mass spectra and elemental anal.

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Reference:
Quinoxaline – Wikipedia,
Quinoxaline | C8H6N2 | ChemSpider

Computed Properties of C16H16Cl2Cu2. 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: Chloro(1,5-cyclooctadiene)copper(I) dimer, is researched, Molecular C16H16Cl2Cu2, CAS is 32717-95-6, about Liquid-phase oxidation of transition metals. 3. Direct synthesis of chelate complexes of Group IA and VIII metals. Author is Kurskov, S. N.; Ivleva, I. N.; Lavrent’ev, I. P.; Khidekel, M. L..

The reactions of Co, Ni, and Cu were studied with organic systems, containing a chelating ligand, the introduction of which into the organic system permits the synthesis of new complexes. Thus, CoL(acac)2 (L = α,α’-dipyridyl (I), γ,γ’-dipyridyl, Hacac = acetylacetone), H[CoCl2(DMG)2] (HDMG = dimethylglyoxime), CoQ2(H2O)2 (HQ = 8-hydroxyquinoline), NiL(acac)2 (L = I), NiLCl2 (L = I), NiCl2(Me2SO)3(HDMG), Ni(DMG)2, NiCl2(HDMG)2Z (Z = dimethylacetamide), [Cu(COD)Cl]2 (COD = 1,5-cyclooctadiene), CuCl2(HDMG)Z, CuCl2(HDMG), [CuCl2(HDMG)]2Me2SO, CuLCl2 (L = I), Cu(DMG)2, and Cu(acac)2.

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Reference:
Quinoxaline – Wikipedia,
Quinoxaline | C8H6N2 | ChemSpider