Day: April 18, 2022

The three-dimensional configuration of the ester heterocycle is basically the same as that of the carbocycle. Compound: 3,5-Dimethyl-4-nitropyridine 1-oxide(SMILESS: O=[N+](C1=C(C)C=[N+]([O-])C=C1C)[O-],cas:14248-66-9) is researched.Electric Literature of C7H13NO2. The article 《Ab initio studies of acid-base reactions in the substituted 4-nitropyridine N-oxide systems》 in relation to this compound, is published in Journal of Molecular Structure: THEOCHEM. Let’s take a look at the latest research on this compound (cas:14248-66-9).

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

Electric Literature of C7H13NO2. The mechanism of aromatic electrophilic substitution of aromatic heterocycles is consistent with that of benzene. Compound: 1-Piperidineacetic Acid, is researched, Molecular C7H13NO2, CAS is 3235-67-4, about Synthesis of compounds with heteroconjugated intramolecular hydrogen bonds with strong proton polarizability. Author is Brzezinski, Bogumil.

Thirty-one title compounds were prepared Hydrolysis of o-NCC6H4CH2NMe2 gave HO2CC6H4CH2NMe2. Lithiation-carboxylation of RCHMe2 (R = 2-pyridyl N-oxide) gave RCMe2CO2H. Grignard reaction of R1Br (R1 = 8-quinolyl N-oxide) with HCHO gave R1CH2OH. R2(CH2)nCO2H (R2 = piperidino; n = 1-4) reacted with 4-R3C6H4NH2 (R3 = H, Me, OMe, NMe2, Cl, Ac, NO2) to give R2(CH2)nCONHC6H4R3-4.

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Reference:
Isoxazole – Wikipedia,
Isoxazole | C3H3NO – PubChem

Reference of 3,5-Dimethyl-4-nitropyridine 1-oxide. Aromatic compounds can be divided into two categories: single heterocycles and fused heterocycles. Compound: 3,5-Dimethyl-4-nitropyridine 1-oxide, is researched, Molecular C7H8N2O3, CAS is 14248-66-9, about Aromaticity and tautomerism. IV. Free energy-enthalpy correlations for protonation of pyridine bases and azine N-oxides and temperature variation of the HO and HA acidity functions. Author is Cook, Michael J.; Dassanyake, Nissanke L.; Johnson, C. David; Katritzky, Alan R.; Toone, Trevor W..

Addnl. data considered in abstracting and indexing are available from a source cited in the original document. Thermodn. parameters for the protonation of 9 weakly basic pyridines and 9 azine N-oxides were obtained from pKa measurements at 25, 40, 60, 80, and 90°. Linear ΔH°-pKa correlations were found. The temperature variations of the H0 and HA acidity functions were examined

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Reference:
Isoxazole – Wikipedia,
Isoxazole | C3H3NO – PubChem

Computed Properties of C7H8N2O3. 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 N-Oxides of 11-deficient N-heteroaromatics. VIII. Photochemical rearrangement of pyridine and quinoline 1-oxides having sterically hindered 4-nitro group. Author is Kaneko, Chikara; Yokoe, Ichiro; Yamada, Sachiko.

EtOH (550 ml.) containing 1 g. 3,5,4-Me2(O2N)C5H2NO irradiated (N atm.) 1.5 hrs. by a Hanovia 450 w. high-pressure Hg-arc lamp placed inside a watercooled pyrex immersion well, the solvent evaporated, and the residue recrystallized from 1:10 MeOH-Me2CO yielded 30% 3,5,4-Me2(HO)C5H2NO, m. 184°, (Hertog and Combe, CA 47, 5938c). A mechanistic pathway involving nitro-nitrite rearrangement as a key step was tentatively suggested. Steric hindrance by the 2 ortho Me groups may prevent abstraction of H from the solvents by the excited species and thus inhibit formation of the 4-hydroxyamino compound Under the above conditions photolysis of 4-nitroquinoline 1-oxide gave only 7% 2,4-dihydroxyquinoline, m. 300°, whereas 3-methyl-4-nitroquinoline 1-oxide gave 30% 3-methyl-2,4-dihydroxyquinoline, m. 264-5°; monoacetate, m. 241-3°. Contrary to the photolysis of 4-nitro derivatives of pyridine, 2-picoline, 3-picoline, and 2,6-lutidine 1-oxides, the presence of O did not affect the formative of these products but the yields of the corresponding 4-hydroxy derivatives were somewhat lower.

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Reference:
Isoxazole – Wikipedia,
Isoxazole | C3H3NO – PubChem

Reference of 1-Piperidineacetic Acid. The fused heterocycle is formed by combining a benzene ring with a single heterocycle, or two or more single heterocycles. Compound: 1-Piperidineacetic Acid, is researched, Molecular C7H13NO2, CAS is 3235-67-4, about Synthesis and biological evaluation of novel tyrosyl-DNA phosphodiesterase 1 inhibitors with a benzopentathiepine moiety. Author is Zakharenko, Alexandra; Khomenko, Tatyana; Zhukova, Svetlana; Koval, Olga; Zakharova, Olga; Anarbaev, Rashid; Lebedeva, Natalya; Korchagina, Dina; Komarova, Nina; Vasiliev, Vladimir; Reynisson, Johannes; Volcho, Konstantin; Salakhutdinov, Nariman; Lavrik, Olga.

Tyrosyl-DNA phosphodiesterase 1 (TDP1) is a promising target for antitumor therapy based on Top1 poison-mediated DNA damage. Several novel benzopentathiepines were synthesized and tested as inhibitors of TDP1 using a new oligonucleotide-based fluorescence assay. The benzopentathiepines have IC50 values in the range of 0.2-6.0 μM. According to the mol. modeling, the conformational flexibility of the dibutylamine group of the most effective inhibitor (3 d) allows it to occupy an advantageous position for effective binding compared to its cyclic counterparts. The study of cytotoxicity of these compounds revealed that all compounds cause an apoptotic cell death in MCF-7 and Hep G2 cells. Therefore the new class of very effective inhibitors of TDP1 was elaborated.

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Reference:
Isoxazole – Wikipedia,
Isoxazole | C3H3NO – PubChem

HPLC of Formula: 676-96-0. Aromatic compounds can be divided into two categories: single heterocycles and fused heterocycles. Compound: Trimethylphosphineoxide, is researched, Molecular C3H9OP, CAS is 676-96-0, about A base-free terminal thorium phosphinidene metallocene and its reactivity toward selected organic molecules. Author is Zhang, Congcong; Hou, Guohua; Zi, Guofu; Walter, Marc D..

The stable base-free terminal phosphinidene thorium metallocene, [η5-1,2,4-(Me3C)3C5H2]2Th:P-2,4,6-tBu3C6H2 (2), can be isolated from the reaction of the thorium dichloride complex [η5-1,2,4-(Me3C)3C5H2]2ThCl2 (1) with 2 equivalent of 2,4,6-(Me3C)3C6H2PHK in THF. The reactivity of 2 in the activation of various small organic mols. such as diselenides, phosphines, imines, ketones, phosphine oxides, thiazole, imidazole derivatives and amines was explored. For example, when complex 2 is treated with Ph2Se2, the phosphinidene is replaced, yielding diselenido compound [η5-1,2,4-(Me3C)3C5H2]2Th(SePh)2 (3). Moreover, E-H (E = P, N, C) bond activation occurs on exposure of 2 to 2,4,6-iPr3C6H2PH2, PhPH2, (p-tolyl)2C:NH, 1-indanone, cyclohexanone, Me3PO, thiazole, 1-methylimidazole and p-toluidine, resulting in the phosphido complex [η5-1,2,4-(Me3C)3C5H2][η5,κ-C-1,2-(Me3C)2-4-(CH2CMe2)C5H2]Th(PH-2,4,6-iPr3C6H2) (4), the metallaheterocycle [η5-1,2,4-(Me3C)3C5H2]2Th(η2-P2Ph2) (5), the iminato phosphido complex [η5-1,2,4-(Me3C)3C5H2]2Th(PH-2,4,6-tBu3C6H2)[N:C(p-tolyl)2] (6), the phosphido enolyl compound [η5-1,2,4-(Me3C)3C5H2]2Th(PH-2,4,6-tBu3C6H2)(κ-O-1-OC9H7) (7), the enolyl complex [η5-1,2,4-(Me3C)3C5H2][η5,κ-C-1,2-(Me3C)2-4-(CH2CMe2)C5H2]Th(κ-O-1-OC6H9) (8), the alkyl complex [η5-1,2,4-(Me3C)3C5H2][η5,κ-C-1,2-(Me3C)2-4-(CH2CMe2)C5H2]Th(κ-O,C-OPMe2CH2) (9), the phosphido thiazolyl complex [η5-1,2,4-(Me3C)3C5H2]2Th(PH-2,4,6-tBu3C6H2)(C3H2NS) (10), the bis-imidazolyl complex [η5-1,2,4-(Me3C)3C5H2]2Th[2-(1-MeC3H2N2)]2 (11), and the imido complex [η5-1,2,4-(Me3C)3C5H2]2Th:N(p-tolyl) (12), resp. Several spectroscopic techniques were employed for the characterization of the new complexes 3-11, and in addition the solid-state mol. structures of compounds 3-6, 8-9 and 11 were further confirmed by x-ray diffraction analyses.

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Reference:
Isoxazole – Wikipedia,
Isoxazole | C3H3NO – PubChem

Application of 2402-95-1. 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: 2-Chloropyridine 1-oxide, is researched, Molecular C5H4ClNO, CAS is 2402-95-1, about Study in synthesis of N-oxide-2-pyridine phenyl sulfide derivative. Author is Li, Shuyan.

N-oxide-2-pyridine Ph sulfide derivatives were prepared by mercapto-reaction of 4-methylthiophenol or 4-chlorothiophenol with N-oxide-2-chloropyridine prepared by oxygenation of 2-chloropyridine with 30% H2O2 in acetic acid. The reaction of nucleophilic displacement on the ring of 2-chloropyridine was discussed. The structures of the synthesized compounds were characterized by IR, 1H NMR, and 13C NMR.

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Reference:
Isoxazole – Wikipedia,
Isoxazole | C3H3NO – PubChem

COA of Formula: C3H9OP. 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: Trimethylphosphineoxide, is researched, Molecular C3H9OP, CAS is 676-96-0, about General Synthesis of Ordered Mesoporous Carbonaceous Hybrid Nanostructures with Molecularly Dispersed Polyoxometallates. Author is Chen, Chunhong; Mao, Shanjun; Tan, Chaoliang; Wang, Zhe; Ge, Yiyao; Ma, Qinglang; Zhang, Xiao; Qi, Guodong; Xu, Jun; Fan, Zhanxi; Wang, Yong.

Hybrid nanomaterials with controlled dimensions, intriguing components and ordered structures have attracted significant attention in nanoscience and technol. Herein, we report a facile and green polyoxometallate (POM)-assisted hydrothermal carbonization strategy for synthesis of carbonaceous hybrid nanomaterials with molecularly dispersed POMs and ordered mesopores. By using various polyoxometallates such as ammonium phosphomolybdate, silicotungstic acid, and phosphotungstic acid, our approach can be generalized to synthesize ordered mesoporous hybrid nanostructures with diverse compositions and morphologies (nanosheet-assembled hierarchical architectures, nanospheres, and nanorods). Moreover, the ordered mesoporous nanosheet-assembled hierarchical hybrids with molecularly dispersed POMs exhibit remarkable catalytic activity toward the dehydration of tert-butanol with the high isobutene selectivity (100%) and long-term catalytic durability (80 h).

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Reference:
Isoxazole – Wikipedia,
Isoxazole | C3H3NO – PubChem

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.Kaneko, Chikara; Yokoe, Ichiro; Yamada, Sachiko published the article 《N-Oxides of 11-deficient N-heteroaromatics. VIII. Photochemical rearrangement of pyridine and quinoline 1-oxides having sterically hindered 4-nitro group》 about this compound( cas:14248-66-9 ) in Tetrahedron Letters. Keywords: PYRIDINES PHOTO REARRANGEMENT; QUINOLINE PHOTO REARRANGEMENT; PHOTO REARRANGEMENT QUINOLINE; REARRANGEMENT PHOTO QUINOLINE. Let’s learn more about this compound (cas:14248-66-9).

EtOH (550 ml.) containing 1 g. 3,5,4-Me2(O2N)C5H2NO irradiated (N atm.) 1.5 hrs. by a Hanovia 450 w. high-pressure Hg-arc lamp placed inside a watercooled pyrex immersion well, the solvent evaporated, and the residue recrystallized from 1:10 MeOH-Me2CO yielded 30% 3,5,4-Me2(HO)C5H2NO, m. 184°, (Hertog and Combe, CA 47, 5938c). A mechanistic pathway involving nitro-nitrite rearrangement as a key step was tentatively suggested. Steric hindrance by the 2 ortho Me groups may prevent abstraction of H from the solvents by the excited species and thus inhibit formation of the 4-hydroxyamino compound Under the above conditions photolysis of 4-nitroquinoline 1-oxide gave only 7% 2,4-dihydroxyquinoline, m. 300°, whereas 3-methyl-4-nitroquinoline 1-oxide gave 30% 3-methyl-2,4-dihydroxyquinoline, m. 264-5°; monoacetate, m. 241-3°. Contrary to the photolysis of 4-nitro derivatives of pyridine, 2-picoline, 3-picoline, and 2,6-lutidine 1-oxides, the presence of O did not affect the formative of these products but the yields of the corresponding 4-hydroxy derivatives were somewhat lower.

Compounds in my other articles are similar to this one(3,5-Dimethyl-4-nitropyridine 1-oxide)Category: isoxazole, you can compare them to see their pros and cons in some ways,such as convenient, effective and so on.

Reference:
Isoxazole – Wikipedia,
Isoxazole | C3H3NO – PubChem

Formula: C5H4ClNO. 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: 2-Chloropyridine 1-oxide, is researched, Molecular C5H4ClNO, CAS is 2402-95-1, about Periselectivity between the [1,4] and [3,3] thermal sigmatropic rearrangements of 2-allyloxypyridine N-oxides. Author is Alker, David; Ollis, W. David; Shahriari-Zavareh, Hooshang.

Thermal rearrangement of 2-allyloxpyridine N-oxides I (R = H, OMe, NO2) yields N-allyloxy-2-pyridones II and 3-allyl-N-hydroxy-2-pyridones III. These transformations are regiospecific and on this basis it is proposed that the reactions involve concerted [1,4] and [3,3] sigmatropic rearrangements. Supporting evidence based on solvent effects, temperature effects, and substituent effects is given.

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Reference:
Isoxazole – Wikipedia,
Isoxazole | C3H3NO – PubChem