Category: 14248-66-9

Laihia, K.; Puszko, A.; Linnanto, J.; Kolehmainen, E. 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: 3,5-Dimethyl-4-nitropyridine 1-oxide. 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.

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

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 omeprazole, published in 2002-08-31, which mentions a compound: 14248-66-9, mainly applied to omeprazole production process, Formula: C7H8N2O3.

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,
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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 Absorption and phosphorescence spectra of 4-nitropyridine N-oxides and 4- and 3-nitroquinoline N-oxides, the main research direction is nitropyridine oxide UV phosphorescence; oscillator strength nitropyridine oxide; MO nitropyridine oxide UV; pyridine oxide UV phosphorescence; nitroquinoline oxide UV phosphorescence; quinoline oxide UV phosphorescence.COA of Formula: C7H8N2O3.

SCF-MO-CI calculations were used to facilitate interpretation of the absorption, phosphorescence, and phosphorescence excitation spectra of 4-nitropyridine N-oxide (I), its 3-methyl and 3,5-dimethyl derivatives, and 3- and 4-nitroquinoline N-oxide. For I, the phosphorescence lifetime, the degree of polarization of the phosphorescence and excitation spectra, and the single-triplet energy gap were studied. The main feature of the absorption at long wavelength was intramol. charge-transfer from the O of the NO group to the NO2 group. The nature of the lowest triplet state was discussed, this state resulting from a π-π* transition and being 3A1 for I. The phosphorescence spectra exhibited a blue shift on changing the solvent from Et2O to Me2CHOH.

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Reference:
Isoxazole – Wikipedia,
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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 Dipole moments and spectroscopic properties of methyl-4-nitropyridine N-oxides, published in 1996-07-31, which mentions a compound: 14248-66-9, Name is 3,5-Dimethyl-4-nitropyridine 1-oxide, Molecular C7H8N2O3, HPLC of Formula: 14248-66-9.

Mol. dipole moments and dipole moments of interaction of 7 Me derivatives of 4-nitropyridine N-oxides were determined in benzene solution Polar and 13C-NMR and UV/Vis manifestations of intramol. interaction indicate that the Me groups modify the electronic interaction between the NO and NO2 groups mainly through steric strain.

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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 Potentiometric studies of acid-base interactions in substituted 4-nitropyridine N-oxide systems, the main research direction is nitropyridine oxide derivative acid base equilibrium constant polar solvent.COA of Formula: C7H8N2O3.

(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

HPLC of Formula: 14248-66-9. 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: 3,5-Dimethyl-4-nitropyridine 1-oxide, is researched, Molecular C7H8N2O3, CAS is 14248-66-9, about The influence of steric effect on 1H NMR, 13C NMR, and IR spectra of methylated derivatives of 4-nitropyridine N-oxide. Author is Puszko, A.; Wasylina, L..

The 1H NMR, 13C NMR, and IR spectra of 2-methyl-. 2,3-dimethyl-, 2,5-dimethyl-, 2,6-dimethyl-, 3,5-dimethyl-, and 2,3,6-trimethyl-4-nitropyridine N-oxides were interpreted. The influence of electron properties of substituents on changes of chem. shifts was analyzed. It was found that “”ortho-effect”” of the Me group inhibits paramagnetism of the nitro group. The ratio between a given substituted heterocyclic compound, its parent compound and the identically substituted benzene derivatives has been determined It was found that the effect of the nitro group on chem. shift and the so-called back donation is modified by electronegativity and the position of the substituent.

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Isoxazole – Wikipedia,
Isoxazole | C3H3NO – PubChem

Product Details of 14248-66-9. 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 Synthesis of 2-[[(4-fluoroalkoxy-2-pyridyl)methyl]sulfinyl]-1H-benzimidazoles as antiulcer agents. Author is Kubo, Keiji; Oda, Katsuaki; Kaneko, Tatsuhiko; Satoh, Hiroshi; Nohara, Akira.

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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Isoxazole – Wikipedia,
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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: 3,5-Dimethyl-4-nitropyridine 1-oxide, is researched, Molecular C7H8N2O3, CAS is 14248-66-9, about Studies on diazepines. XXVI. Syntheses of 6H-1,4-diazepines and 1-acyl-1H-1,4-diazepines from 4-pyridyl azides.Recommanded Product: 3,5-Dimethyl-4-nitropyridine 1-oxide.

Photolysis of 4-azidopyridines I (R-R3 = H, Me) in the presence of methoxide resulted in ring expansion to give 5-methoxy-6H-1,4-diazepines II (R-R3 = H, Me), presumably via azirine intermediates derived from the initially formed singlet pyridylnitrenes. Treatment of II (R-R3 = H) with R4COCl (R4 = Ph, Me, EtO) in pyridine afforded the 1-acyldiazepines III (R4 = Ph, Me, EtO), whose structures were confirmed by means of thermal and photochem. reactions.

From this literature《Studies on diazepines. XXVI. Syntheses of 6H-1,4-diazepines and 1-acyl-1H-1,4-diazepines from 4-pyridyl azides》,we know some information about this compound(14248-66-9)Recommanded Product: 3,5-Dimethyl-4-nitropyridine 1-oxide, but this is not all information, there are many literatures related to this compound(14248-66-9).

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Isoxazole – Wikipedia,
Isoxazole | C3H3NO – PubChem

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: 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.Application of 14248-66-9.

(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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The preparation of ester heterocycles mostly uses heteroatoms as nucleophilic sites, which are achieved by intramolecular substitution or addition reactions. Compound: 3,5-Dimethyl-4-nitropyridine 1-oxide( cas:14248-66-9 ) is researched.Category: isoxazole.Puszko, A.; Wasylina, L.; Pawelka, Z. published the article 《Dipole moments and spectroscopic properties of methyl-4-nitropyridine N-oxides》 about this compound( cas:14248-66-9 ) in Monatshefte fuer Chemie. Keywords: methylnitropyridine oxide dipole moment charge transfer; charge transfer steric effect methylnitropyridine oxide. Let’s learn more about this compound (cas:14248-66-9).

Mol. dipole moments and dipole moments of interaction of 7 Me derivatives of 4-nitropyridine N-oxides were determined in benzene solution Polar and 13C-NMR and UV/Vis manifestations of intramol. interaction indicate that the Me groups modify the electronic interaction between the NO and NO2 groups mainly through steric strain.

If you want to learn more about this compound(3,5-Dimethyl-4-nitropyridine 1-oxide)Category: isoxazole, you may wish to communicate with the author of the article,or consult the relevant literature related to this compound(14248-66-9).

Reference:
Isoxazole – Wikipedia,
Isoxazole | C3H3NO – PubChem