Category: 14248-66-9

HPLC of Formula: 14248-66-9. 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: 3,5-Dimethyl-4-nitropyridine 1-oxide, is researched, Molecular C7H8N2O3, CAS is 14248-66-9, about Potentiometric studies of acid-base interactions in substituted 4-nitropyridine N-oxide systems.

(Acid + base) equilibrium constants, involving the acidity (pKACa) and cationic homoconjugation constants (in the form of lg KANBHB+), have been determined by the potentiometric method in 13 systems formed by substituted 4-nitropyridine N-oxides in the polar aprotic solvent, acetone (AC). The derivatives covered a wide range of proton-acceptor properties and inherent diversified tendencies towards formation of hydrogen-bonded cations. In addition, the constant values (expressed as pKANa and lg KANBHB+) for two of the systems studied, N-oxides of 2-methylamino- and 2-ethylamino-4-nitropyridine, were determined in acetonitrile (AN). The acidity constants in the non-aqueous media studied have been found to change in line with their substituent effects and the sequence of acidity changes in water. The values of the cationic homoconjugation constants increased with increasing basicity of the N-oxides and decreased with increasing solvent basicity.

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Reference:
Isoxazole – Wikipedia,
Isoxazole | C3H3NO – PubChem

Heterocyclic compounds can be divided into two categories: alicyclic heterocycles and aromatic heterocycles. Compounds whose heterocycles in the molecular skeleton cannot reflect aromaticity are called alicyclic heterocyclic compounds. Compound: 14248-66-9, is researched, Molecular C7H8N2O3, about Methyl-substituted 4-nitropyridine N-oxides as ligands: Structural, spectroscopic, magnetic and cytotoxic characteristics of copper(II) complexes, the main research direction is nitropyridine oxide methylated copper complex preparation antitumor activity; crystal structure copper methylnitropyridine oxide complex; MSBAR methylated nitropyridine copper complex antitumor activity.Electric Literature of C7H8N2O3.

Seven new mono- and dinuclear Cu(II) complexes containing various Me substituted 4-nitropyridine N-oxides as ligands were isolated and characterized physicochem. and biol. The characterization included elemental anal., magnetic and spectroscopic methods (diffuse reflectance and UV-visible absorption, IR, FIR). A single crystal x-ray diffraction anal. was performed for the complex with 2,5-dimethyl-4-nitropyridine N-oxide. Trans- and cis-square planar configuration around Cu ion was established for mono- and dinuclear species, resp. In methanolic solutions the dinuclear species decompose into mononuclear ones with increasing 4 → 6 coordination number with attachment of two solvent mols. The IR spectra showed that the strength of the Cu-ligand bond gauged by the degree of N-O elongation changed irregularly with position and number of Me groups. Cytotoxic studies on the MCF-7 human breast cancer line revealed a structure-activity relation: double blocking of the NO2 group with two CH3 groups rendered the complex completely inactive. The complexes were not significantly active against human cancer cell lines A549 (non-small cell lung carcinoma) and HL-60 (human promyelocytic leukemia) (no data).

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Reference:
Isoxazole – Wikipedia,
Isoxazole | C3H3NO – PubChem

The chemical properties of alicyclic heterocycles are similar to those of the corresponding chain compounds. Compound: 3,5-Dimethyl-4-nitropyridine 1-oxide, is researched, Molecular C7H8N2O3, CAS is 14248-66-9, about Synthesis of omeprazole, the main research direction is omeprazole production process.Related Products of 14248-66-9.

The title compound was prepared from 5-methoxy-1H-benzimidazole-2-thiol by condensation with 2-(chloromethyl)-4-methoxy-3,5-dimethylpyridine followed by oxidation with m-chloroperoxybenzoic acid. The yield was 84.6%.

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Reference:
Isoxazole – Wikipedia,
Isoxazole | C3H3NO – PubChem

Safety of 3,5-Dimethyl-4-nitropyridine 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: 3,5-Dimethyl-4-nitropyridine 1-oxide, is researched, Molecular C7H8N2O3, CAS is 14248-66-9, about Nucleophilic displacements in substituted pyridine N-oxides. I. Kinetics of the reactions between sodium ethoxide and 2- and 4-bromo-, 4-chloro-, 2-, 3-, and 4-nitro-, 4-chloro-3,5-dimethyl-, and 3,5-dimethyl-4-nitropyridine 1-oxide in anhydrous ethanol. Author is Johnson, Ronald Mark.

Rates of reaction of halo and nitro pyridine N-oxides with sodium ethoxide in anhydrous ethanol were measured and the Arrhenius parameters calculated and discussed. The reaction rates, entropies, and energies of activation for nitro group displacements all decrease in the order 2 > 4 > 3. With the bromopyridine N-oxides both the entropy and energy of activation decrease in the order 4 > 2, but the positional reactivity is 2 > 4. Two methyl groups adjacent to the leaving group retard the reactions of 4-bromo-and 4-nitro-3,5-dimethylpyridine 1-oxide (I). Low activation energies are attributed to hindrance of nitro group conjugation in the ground state, either by N-oxide, oxygen dipolar repulsion (for 2-nitropyridine 1-oxide) or steric inhibition (in I). Small neg. or small pos. values obtained for activation entropies are attributed to extensive desolvation in forming the transition state. The very high entropy of activation for the reaction of 2-nitropyridine 1-oxide is attributed to the increased freedom of rotation of the nitro group in the transition state compared to the restriction imposed by the N-oxide oxygen in the ground state.

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Reference:
Isoxazole – Wikipedia,
Isoxazole | C3H3NO – PubChem

The chemical properties of alicyclic heterocycles are similar to those of the corresponding chain compounds. Compound: 3,5-Dimethyl-4-nitropyridine 1-oxide, is researched, Molecular C7H8N2O3, CAS is 14248-66-9, about Synthesis of 2-[[(4-fluoroalkoxy-2-pyridyl)methyl]sulfinyl]-1H-benzimidazoles as antiulcer agents, the main research direction is benzimidazole fluoroalkoxypyridylmethylsulfinyl preparation antiulcer.Safety of 3,5-Dimethyl-4-nitropyridine 1-oxide.

Many title compounds (I, R1 = H, F, alkoxy, CF3 or MeSO2, R2 and R4 = H or Me, R3 = CF3, C2F5, HCF2CF2 or CCl3) were synthesized and tested for antisecretory, antiulcer, and cytoprotective activities. Most of these compounds were superior to omeprazole in antisecretory and antiulcer potencies, and especially in protecting the gastric mucosa from ethanol-induced damage. AG-1749 (Iansoprazole) (I, R1 = R4 = H, R2 = Me, R3 = CF3), was selected for further development and clin. evaluation.

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Reference:
Isoxazole – Wikipedia,
Isoxazole | C3H3NO – PubChem

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, Canadian Journal of Chemistry called Thermodynamics of protonation of weak bases in sulfuric acid-water media, determined using the excess acidity method, Author is Cox, Robin A.; Yates, Keith, which mentions a compound: 14248-66-9, SMILESS is O=[N+](C1=C(C)C=[N+]([O-])C=C1C)[O-], Molecular C7H8N2O3, HPLC of Formula: 14248-66-9.

The excess acidity method was used to investigate the thermodn. of the protonation process for those weak bases for which the ionization ratios (or optical densities) at several temperatures were measured in aqueous H2SO4. Standard enthalpies and entropies, at 25° in the aqueous reference state, are given for 13 primary, 1 secondary, and 2 tertiary nitroanilines, 3 cyclocompds., 13 triphenylmethanols, 3 other carbocation precursors, 2 ketones, 9 pyridines, and 9 azine N-oxides. Guidelines for estimating pKBH+ at any temperature for other weak bases are discussed.

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Reference:
Isoxazole – Wikipedia,
Isoxazole | C3H3NO – PubChem

In organic chemistry, atoms other than carbon and hydrogen are generally referred to as heteroatoms. The most common heteroatoms are nitrogen, oxygen and sulfur. Now I present to you an article called Synthesis of 2-[[(4-fluoroalkoxy-2-pyridyl)methyl]sulfinyl]-1H-benzimidazoles as antiulcer agents, published in 1990-10-31, which mentions a compound: 14248-66-9, mainly applied to benzimidazole fluoroalkoxypyridylmethylsulfinyl preparation antiulcer, Name: 3,5-Dimethyl-4-nitropyridine 1-oxide.

Many title compounds (I, R1 = H, F, alkoxy, CF3 or MeSO2, R2 and R4 = H or Me, R3 = CF3, C2F5, HCF2CF2 or CCl3) were synthesized and tested for antisecretory, antiulcer, and cytoprotective activities. Most of these compounds were superior to omeprazole in antisecretory and antiulcer potencies, and especially in protecting the gastric mucosa from ethanol-induced damage. AG-1749 (Iansoprazole) (I, R1 = R4 = H, R2 = Me, R3 = CF3), was selected for further development and clin. evaluation.

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Reference:
Isoxazole – Wikipedia,
Isoxazole | C3H3NO – PubChem

Makowska, Joanna; Makowski, Mariusz; Gurzynski, Lukasz; Chmurzynski, Lech published an article about the compound: 3,5-Dimethyl-4-nitropyridine 1-oxide( cas:14248-66-9,SMILESS:O=[N+](C1=C(C)C=[N+]([O-])C=C1C)[O-] ).Recommanded Product: 14248-66-9. 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:14248-66-9) through the article.

The energies and Gibbs free energies of protonation and homocomplexed cation formation were determined by ab initio methods at the RHF, MP2 levels and in the PCM solvation model for 15 4-nitropyridine derivatives using the 6-311 + G** basis set. The results of ab initio calculations confirmed that the acidity constants in the non-aqueous media studied changed in terms of their substituent effects and the sequence of acidity changes in water. Furthermore, the values of the cationic homoconjugation energy parameters and equilibrium constants increased with increasing basicities of the N-oxides studied. The proton-transfer energy surface in the homoconjugated cation of the 2-methyl-4-nitropyridine N-oxide exhibits a double min., with 2.44 kcal/mol energy barrier. This barrier vanishes when the thermodn. correction is included.

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Reference:
Isoxazole – Wikipedia,
Isoxazole | C3H3NO – PubChem

The chemical properties of alicyclic heterocycles are similar to those of the corresponding chain compounds. Compound: 3,5-Dimethyl-4-nitropyridine 1-oxide, is researched, Molecular C7H8N2O3, CAS is 14248-66-9, about 1H, 13C and 15N NMR spectral and theoretical studies of some methyl and alkylamino derivatives of 4-halopyridine N-oxides, the main research direction is halopyridine oxide methyl alkylamino derivative NMR tautomerism.Category: isoxazole.

Nine new and three earlier known 4-halogen (Cl and Br) substituted pyridine N-oxides have been prepared and their 1H, 13C and 15N NMR chem. shifts assigned based on PFG 1H, X (X = 13C and 15N) HMQC and HMBC experiments as well as the comparison with our earlier results for substituted pyridine N-oxide derivatives The 15N resonances of the pyridine nitrogen are 27-40 ppm more shielded in 4-halo-2-alkylamino-6-methyl-5-nitropyridine N-oxide than in parent 4-halopyridine N-oxide. According to quantum chem. ab initio HF/6-311G** calculations the amino tautomer of 4-chloro-2-methylamino-6-methyl-5-nitropyridine N-oxide is more stable than its imino form. Using B3LYP/6-311G** optimized structures both 13C and 15N shifts were calculated by d. functional B3LYP/6-311G** CSGT methods for the amino and imino tautomers as well as for the dimeric structure for 4-chloro-2-methylamino-6-methyl-5-nitropyridine N-oxide. The 15N NMR and DFT calculations suggest the prevailing of the dimeric amino form for one congener, which is further supported by ESI-TOF MS data.

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Reference:
Isoxazole – Wikipedia,
Isoxazole | C3H3NO – PubChem

Electric Literature of C7H8N2O3. The mechanism of aromatic electrophilic substitution of aromatic heterocycles is consistent with that of benzene. Compound: 3,5-Dimethyl-4-nitropyridine 1-oxide, is researched, Molecular C7H8N2O3, CAS is 14248-66-9, about Heteroaromaticity. 8. The influence of N-oxide formation on heterocyclic aromaticity. Author is Bird, Clive W..

A recently described aromaticity index(author, 1992) has been used to examine the changes in the aromaticity of nitrogen heterocycles that accompany their N-oxidation Some instances are noted where there is an unforeseen increase in aromatic character. The aromaticity indexes is isomeric furoxans can be a useful indication as to their relative stabilities.

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Reference:
Isoxazole – Wikipedia,
Isoxazole | C3H3NO – PubChem