Category: 2402-95-1

Boehner, Ulrich; Zundel, Georg published the article 《Broad single-minimum proton potential and proton polarizability of the hydrogen bonds in trifluoroacetic acid + pyridine N-oxide systems as a function of donor and acceptor properties and environment. Infrared studies》. Keywords: fluoroacetic acid pyridine oxide complexation; proton potential trifluoroacetic acid complex; polarizability proton trifluoroacetic acid complex; hydrogen bond trifluoroacetic acid complex.They researched the compound: 2-Chloropyridine 1-oxide( cas:2402-95-1 ).Formula: C5H4ClNO. 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:2402-95-1) here.

F3CCO2H + pyridine-N-oxide (1:1) system properties were studied in CCl4 and MeCN as functions of the basicity of the N-oxide. In CCl4, acid-base complexes are formed almost completely, whereas in MeCN the degree of complex formation increases with increasing basicity of the N-oxide. In the O-…H+…ON bonds, a single-min. proton potential is present, and if the degree of symmetry of this potential is sufficiently large continua indicate that these H bonds show a large proton polarizability caused by the fluctuating proton. The broad single-min. potential well shifts with increasing basicity of the N-oxide, from the donor to the acceptor. This shift is larger in MeCN solutions than in CCl4 solutions since in the polar solvent the interaction of the H-bond dipole with the reaction field induced by it in the solvent is larger.

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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.Zhao, Wei; Yang, Chunxia; Ding, Yong; Ma, Baochun researched the compound: 2-Chloropyridine 1-oxide( cas:2402-95-1 ).Reference of 2-Chloropyridine 1-oxide.They published the article 《The oxidation of pyridines catalyzed by surfactant-encapsulated polyoxometalate [(C18H37)2(CH3)2N]8[HBW11O39] with the temperature-responsive property of solubility》 about this compound( cas:2402-95-1 ) in New Journal of Chemistry. Keywords: oxidation pyridine catalyzed surfactant encapsulated polyoxometalate solubility. We’ll tell you more about this compound (cas:2402-95-1).

Temperature-responsive characterization of solubility based on a surfactant-encapsulated polyoxometalate ([(C18H37)2(CH3)2N]8[HBW11O39]) in tert-Bu alc. was described and used in catalytic oxidation of pyridines. The catalyst could be recovered and reused several times by controlling the temperature

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Category: isoxazole. The mechanism of aromatic electrophilic substitution of aromatic heterocycles is consistent with that of benzene. Compound: 2-Chloropyridine 1-oxide, is researched, Molecular C5H4ClNO, CAS is 2402-95-1, about New synthesis of ZPT additive. Author is Zhao, Zengguo; Li, Wei; Zhang, Songwei; Hao, Jinku; Wang, Guilin.

2-Pyridinethiol-1-oxide zinc salt (ZPT) was prepared via photochlorination, N-oxidation, mercaptization, and complexation 4 steps. It is a very good additive of antipruritic and antidandruff of shampoo. The new synthetic method reduced the steps and raised the productivity. The total yield reached 70%.

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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 Hydroheteroarylation of Unactivated Alkenes Using N-Methoxyheteroarenium Salts, published in 2017-04-26, which mentions a compound: 2402-95-1, Name is 2-Chloropyridine 1-oxide, Molecular C5H4ClNO, Formula: C5H4ClNO.

We report the first reductive coupling of unactivated alkenes with N-methoxy pyridazinium, imidazolium, quinolinium, and isoquinolinium salts under hydrogen atom transfer (HAT) conditions, and an expanded scope for the coupling of alkenes with N-methoxy pyridinium salts. N-Methoxy pyridazinium, imidazolium, quinolinium, and isoquinolinium salts are accessible in 1-2 steps from the com. arenes or arene N-oxides (25-99%). N-Methoxy imidazolium salts are accessible in three steps from com. amines (50-85%). In total 36 discrete methoxyheteroarenium salts bearing electron-donating, electron-withdrawing, alkyl, aryl, halogen, and haloalkyl substituents were prepared (several in multigram quantities) and coupled with 38 different alkenes. The transformations proceed under neutral conditions at ambient temperature, provide monoalkylation products exclusively, and form a single alkene addition regioisomer. Preparatively useful and complementary site selectivities in the addition of secondary and tertiary radicals to pyridinium salts are documented: harder secondary radicals favor C-2 addition (2->10:1), while softer tertiary radicals favor bond formation to C-4 (4.7->29:1). A diene possessing a 1,2-disubstituted and 2,2-disubstituted alkene undergoes hydropyridylation at the latter exclusively (61%) suggesting useful site selectivities can be obtained in polyene substrates. The methoxypyridinium salts can also be employed in dehydrogenative arylation, borono-Minisci, and tandem arylation processes. Mechanistic studies support the involvement of a radical process.

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The reaction of an aromatic heterocycle with a proton is called a protonation. One of articles about this theory is 《Aromatic fluorine compounds. IX. 2-Fluoropyridines》. Authors are Finger, G. C.; Starr, Laurence D..The article about the compound:2-Chloropyridine 1-oxidecas:2402-95-1,SMILESS:ClC1=CC=CC=[N+]1[O-]).HPLC of Formula: 2402-95-1. Through the article, more information about this compound (cas:2402-95-1) is conveyed.

cf. C.A. 53, 13090c. Anhydrous KF (I) 9 g., 12.3 g. 2-chloro-3-nitropyridine and 30 ml. HCONMe2 (DMF) was heated 6 hrs. at 150°, cooled, the mixture poured onto crushed ice, saturated with NaCl, steam distilled, the distillate extracted with Et2O, dried and distilled to give 8.4 g. 2-fluoro-3-nitropyridine, b10 109-9.5° n25D 1.5278. I (73.3 g.) added to a stirred solution of 100 g. 2-chloro-5-nitropyridine and 300 ml DMF at 120°, cooled and processed as above gave 70.1 g. 2-fluoro-5-nitropyridine b7 86-7°, n25D 1.5243. NaNO2 (13.3 g.) in 65 ml. H2O added dropwise with stirring at -2° to 0° to 28 g. 2-amino-3-bromo-5-nitropyridine in aqueous H2SO4 (25%, 900 ml.), the mixture boiled, filtered and cooled gave 18.3 g. 3-bromo-5-nitropyridine (II), m. 212° (decomposition) (H2O). II (4.1 g.), 4 g. PCl3 and 1 ml. POCl3 stirred and refluxed 3 hrs., the mixture concentrated in vacuo and poured onto crushed ice gave 4.2 g. 3-bromo-2-chloro-5-nitropyridine (III), m. 67.3-8.0° after sublimation at 60-70° 2 mm. A stirred mixture of 3.8 g. III, 15 ml. DMF and 1.8 g. I was heated 1 hr. at 100° cooled, poured onto ice, steam distilled, the distillate extracted with Et2O, dried and evaporated to give 2.5 g. crude 3-bromo-2-fluoro-5-nitropyridine; this repeatedly vacuum sublimed gave 1.78 g. pure product, m. 60-1.5° Peracetic acid (40%, 137 ml.) was added dropwise to a stirred solution of 50 g. 2-chloropyridine (IV) and 66 ml. glacial AcOH at 45° the mixture heated 5 hrs. at 50° and 17 hrs. at 70°, concentrated in vacuo to 150 ml. on a steam-bath, poured onto crushed ice, made strongly alk. with 40% NaOH, extracted with CHCl3 dried with MgSO4 and a small amount Na2CO3, the extract evaporated and diluted with 10 ml. anhydrous Et2O gave 45.8 g. 2-chloropyridine N-oxide (V), m. 69-9.5° (Et2O-EtOH). To a mixture obtained by adding 10 g. V to 15 ml. concentrated H2SO4 was added with stirring at 1-2° over 45 min. a mixture of 15 ml. concentrated H2SO4 and 27 ml. fuming HNO3 (sp. gr. 1.5), the mixture heated over 1 hr. to 90°, stirred 1 hr. at 90° cooled to 10° poured onto stirred ice-H2O, neutralized with Na2CO3, filtered, the yellow precipitate partially air dried, dissolved in hot CHCl3, the aqueous filtrate extracted with CHCl3 and the combined CHCl3 solutions dried and evaporated to give 11.4 g. crude 2-chloro-4-nitropyridine N-oxide (VI) m. 153-3.5° (EtOH-CHCl3.) 2-Chloro-4-nitropyridine (VII) was obtained in 91% yield by Hamana procedure (C.A. 50, 1817a). VII (5 g.), 3.7 g. I and 10 ml. di-Me sulfoxide gave a good halide test after being heated 1 hr. at 160°; the mixture was cooled, poured onto crushed ice, saturated with NaCl, steam distilled The distillate was extracted repeatedly with CHCl3; the combined extracts dried and evaporated gave no residue, but the pot residue from the steam distillation gave a small portion of solid, unidentified, m. 100.5-5.0° after sublimation. VII and di-Me sulfoxide in the absence of I gave no evidence of reaction. Dry HCl was passed 2.25 hrs. into a stirred solution of 20 g. IV in 200 ml. anhydrous Et2O and the Et2O evaporated in vacuo to leave 23.4 g. hygroscopic needles, 2-chloropyridine-HCl m. 101.5-2.0°, decomposing on standing, darkening on exposure to light.

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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: 2-Chloropyridine 1-oxide( cas:2402-95-1 ) is researched.Computed Properties of C5H4ClNO.Das Gracas Carvalho Cito, Antonia Maria; Dantas Lopes, Jose Arimateia; Miller, Joseph; Moran, Paulo J. S. published the article 《Marked changes in relative nucleophilic strength in comparing SN reactions of some heterocyclic and homocyclic aromatic systems》 about this compound( cas:2402-95-1 ) in Journal of Chemical Research, Synopses. Keywords: benzenethiolate substitution chloropyridine oxide dichloropyridazine; substitution chloropyridine oxide dichloropyridazine kinetics; chloropyridine oxide substitution nucleophile kinetics; chloropyridazine substitution benzenethiolate methoxide kinetics; nucleophilicity benzenethiolate methoxide; methoxide substitution chloropyridine oxide dichloropyridazine. Let’s learn more about this compound (cas:2402-95-1).

The kinetics of the nucleophilic substitution reactions of 2- and 4-chloropyridine 1-oxides (I and II, resp.) and 3,6-dichloropyridazine (III) with MeO- and PhS- in MeOH were determined Comparison of the results with those previously reported for 2,4-(O2N)2C6H3R (R = Cl, iodo) (IV and V, resp.), showed a marked change in the relative nucleophilicity of MeO- and PhS- and PhS- in MeOH. At 0° the PhS-/MeO- rate ratios for IV and V were 1.95 × 103 and 1.68 × 104, resp., whereas for I, II and III they were 5.03, 4.87 and 0.538, resp. These results are discussed in terms of retention of the arenide electrons in the heterocyclic ring.

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Reference:
Isoxazole – Wikipedia,
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Sojka, Stanley A.; Dinan, Frank J.; Kolarczyk, Robert published an article about the compound: 2-Chloropyridine 1-oxide( cas:2402-95-1,SMILESS:ClC1=CC=CC=[N+]1[O-] ).Category: isoxazole. 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:2402-95-1) through the article.

13C NMR spectra of substituted pyridine N-oxides were examined and compared to the spectra of the corresponding free pyridine bases. The N-oxide functionality causes significant shielding at the C-2, C-4, and C-6 positions. This shielding was associated with electron d. donation by the N-oxide functionality to these positions. The N-oxide functionality also caused an enhancement of the substituent α-effect for -NMe2, -OMe, and -NO2 groups.

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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 Aqueous biphasic oxidation: a water-soluble polyoxometalate catalyst for selective oxidation of various functional groups with hydrogen peroxide, published in 2004-02-29, which mentions a compound: 2402-95-1, Name is 2-Chloropyridine 1-oxide, Molecular C5H4ClNO, Recommanded Product: 2-Chloropyridine 1-oxide.

A “”sandwich”” type polyoxometalate, Na12[WZn3(H2O)2][(ZnW9O34)2], was used as an oxidation catalyst in aqueous biphasic reaction media to effect oxidation of alcs., diols, pyridine derivatives, amines and aniline derivatives with hydrogen peroxide. The catalyst was shown by 183W NMR to be stable in aqueous solutions in the presence of H2O2 and showed only minimal non-productive decomposition of the oxidant. Secondary alcs. were selectively oxidized to ketones, while primary alcs. tended to be oxidized to the corresponding carboxylic acids, although secondary alcs. were selectively oxidized in the presence of primary alcs. Vicinal diols yielded carbon-carbon bond cleavage products in very high yields. Pyridine derivatives were oxidized to the resp. N-oxides, but strongly electron-withdrawing moieties inhibited the oxidation reaction. Primary amines were oxidized to the oximes, but significantly hydrolyzed in situ. Aniline derivatives were oxidized to the corresponding azoxy or nitro products depending on the substitution pattern in the aromatic ring. Catalyst recovery and recycle was demonstrated.

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Isoxazole – Wikipedia,
Isoxazole | C3H3NO – PubChem

Formula: C5H4ClNO. 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: 2-Chloropyridine 1-oxide, is researched, Molecular C5H4ClNO, CAS is 2402-95-1, about Catalytic Ynamide Oxidation Strategy for the Preparation of α-Functionalized Amides.

A Lewis acid-catalyzed alkyne oxidation strategy has been developed to produce diverse α-functionalized amides from readily and generally available ynamides. An efficient zinc(II)-catalyzed oxidative azidation and thiocyanation has been achieved, providing facile access to synthetically useful α-azido amides and α-thiocyanate amides, resp. This chem. can also be extended to oxidative halogenations by employing the 2-halopyridine N-oxide as both the oxidant and the halogen source, and its mechanistic rationale is also supported by d. functional theory calculations Moreover, NaBARF has been demonstrated to catalyze such an alkyne oxidation effectively, thus further excluding the metal carbene pathway in this cascade reaction.

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Isoxazole – Wikipedia,
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Formula: C5H4ClNO. The fused heterocycle is formed by combining a benzene ring with a single heterocycle, or two or more single heterocycles. Compound: 2-Chloropyridine 1-oxide, is researched, Molecular C5H4ClNO, CAS is 2402-95-1, about Heteroarene Phosphinylalkylation via a Catalytic, Polarity-Reversing Radical Cascade. Author is Buquoi, J. Quentin; Lear, Jeremy M.; Gu, Xin; Nagib, David A..

A polarity-reversing radical cascade strategy for alkene difunctionalization by vicinal C-C and C-P bond formation has been developed. This approach to concurrently adding phosphorus and a heteroarene across an olefin is enabled by photocatalytic generation of electrophilic P-centered radicals. Upon chemoselective addition to an olefin, the resulting nucleophilic C-centered radical selectively combines with electrophilic heteroarenes, such as pyridines. This multicomponent coupling scheme for phosphinylalkylation complements classic two-component methods for hydrophosphinylation of alkenes and C-H phosphinylation of arenes. Included competition and photoquenching experiments provide insight into the selectivity and mechanism of this polarity-reversal pathway.

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