Tag: M.W:100-200

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 Insights into the mechanistic and synthetic aspects of the Mo/P-catalyzed oxidation of N-heterocycles, published in 2014, which mentions a compound: 1127-45-3, mainly applied to oxidation nitrogen heterocycle phosphomolybdic acid catalyst; nitrogen heterocycle oxide preparation, Safety of 8-Hydroxyquinoline 1-oxide.

A Mo/P catalytic system for an efficient gram-scale oxidation of a variety of nitrogen heterocycles to N-oxides with hydrogen peroxide as terminal oxidant has been investigated. Combined spectroscopic and crystallog. studies point to the tetranuclear Mo4P peroxo complex as one of the active catalytic species present in the solution Based on this finding an optimized catalytic system has been developed. The utility and chemoselectivity of the catalytic system has been demonstrated by the synthesis of over 20 heterocyclic N-oxides.

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Reference:
Quinoxaline – Wikipedia,
Quinoxaline | C8H6N2 | ChemSpider

Recommanded Product: (S)-Propane-1,2-diamine dihydrochloride. The protonation of heteroatoms in aromatic heterocycles can be divided into two categories: lone pairs of electrons are in the aromatic ring conjugated system; and lone pairs of electrons do not participate. Compound: (S)-Propane-1,2-diamine dihydrochloride, is researched, Molecular C3H12Cl2N2, CAS is 19777-66-3, about Enantiomeric impurities in chiral catalysts, auxiliaries, synthons and resolving agents. Part 2. Author is Armstrong, Daniel W.; He, Lingfeng; Yu, Timothy; Lee, Jauh T.; Liu, Yan-song.

The enantiomeric purity of reagents used in asym. synthesis is of fundamental importance when evaluating the selectivity of a reaction and the product purity. In this work, 109 chiral reagents (many recently introduced) are assayed. Approx. 64% of these reagents had moderate to high levels of enantiomeric impurities (i.e. from >0.1% to <16%). The type of chiral reagents assayed and used in enantioselective synthesis include metal-ligand catalysts for allylic substitutions, catalysts for addition of Grignard reagents and other additions, epoxidations and reduction of ketones and aldehydes; Ru-complex auxiliaries for asym. cyclopropanation, as well as amine, diamine, alc., diol, amino alc., carboxylic acid and oxazolidinone auxiliaries; epoxide, lactone, furanone, pyrrolidinone, nitrile, sulfoximine and carboxylic acid synthons (including malic acid, mandelic acid, lactic acid and tartaric acid); and a variety of chiral resolving agents. Accurate, efficient assays for all compounds are given. There is still a lot of research devoted to this compound(SMILES：C[C@H](N)CN.[H]Cl.[H]Cl)Recommanded Product: (S)-Propane-1,2-diamine dihydrochloride, and with the development of science, more effects of this compound(19777-66-3) can be discovered.

Reference:
Quinoxaline – Wikipedia,
Quinoxaline | C8H6N2 | ChemSpider

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.Qi, Zaojuan; Li, Weihe; Niu, Yanning; Benassi, Enrico; Qian, Bo researched the compound: 1-(Bromomethyl)-4-ethylbenzene( cas:57825-30-6 ).Related Products of 57825-30-6.They published the article 《A General Method for the Dibromination of Vicinal sp3 C-H Bonds Exploiting Weak Solvent-Substrate Noncovalent Interactions》 about this compound( cas:57825-30-6 ) in Organic Letters. Keywords: dibromoalkyl benzene preparation; arylethane dibromination. We’ll tell you more about this compound (cas:57825-30-6).

A general procedure of 1,2-dibromination of vicinal sp3 C-H bonds of arylethanes using N-bromosuccinimide as the bromide reagent without an external initiator was established. The modulation of the strength of the intermol. noncovalent interactions between the solvent and arylethane ethanes, quant. evaluated via quantum chem. calculations, allowed to circumvent the fact that arylethane ethane cannot be dibrominated through traditional methods. The mechanism was explored by both experiments and quantum chem. calculations, revealing a radical chain with HAA process.

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Reference:
Quinoxaline – Wikipedia,
Quinoxaline | C8H6N2 | ChemSpider

Electric Literature of F2H8NiO4. The mechanism of aromatic electrophilic substitution of aromatic heterocycles is consistent with that of benzene. Compound: Nickel(ii)fluoridetetrahydrate, is researched, Molecular F2H8NiO4, CAS is 13940-83-5, about Effects of the external magnetic field and chemical combination on Kβ/Kα X-ray intensity ratios of some nickel and cobalt compounds. Author is Porikli, S.; Kurucu, Y..

A systematic study of x-ray intensity ratios of the K-series lines was made on compounds of Ni and Co to examine the influence of chem. state and 0.6 and 1.2 T external magnetic fields on energy-dispersive x-ray fluorescence anal. The samples were excited by 22.69 keV x-rays emitted from a Cd-109 radioisotope source and characteristic K x-rays emitted from the samples were counted by an Si(Li) detector. For B = 0, the present exptl. results were compared with the exptl. and theor. data in literature. The results demonstrate a clear dependence of the Kβ/Kα intensity ratios on the chem. state of the element in the sample and values of external magnetic field.

There is still a lot of research devoted to this compound(SMILES：[H]O[H].[H]O[H].[H]O[H].[H]O[H].[Ni+2].[F-].[F-])Electric Literature of F2H8NiO4, and with the development of science, more effects of this compound(13940-83-5) can be discovered.

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: 8-Hydroxyquinoline 1-oxide, is researched, Molecular C9H7NO2, CAS is 1127-45-3, about A lipase-glucose oxidase system for the efficient oxidation of N-heteroaromatic compounds and tertiary amines.Computed Properties of C9H7NO2.

In this work, a lipase-glucose oxidase system was designed and proven to be an efficient system for the oxidation of N-heteroaromatic compounds and tertiary amines. This dual-enzyme system not only displayed environmental friendliness, but also demonstrated its huge potential in industrial applications.

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Reference:
Quinoxaline – Wikipedia,
Quinoxaline | C8H6N2 | ChemSpider

The chemical properties of alicyclic heterocycles are similar to those of the corresponding chain compounds. Compound: 4-Chloro-6-(1H-imidazol-1-yl)pyrimidine, is researched, Molecular C7H5ClN4, CAS is 114834-02-5, about An electrochemical synthesis of functionalized arylpyrimidines from 4-amino-6-chloropyrimidines and aryl halides, the main research direction is aminochloropyrimidine aryl halide electrochem cross coupling nickel catalyst; biaryl heteroaryl preparation.Recommanded Product: 114834-02-5.

A range of novel 4-amino-6-arylpyrimidines was prepared under mild conditions by an electrochem. reductive cross-coupling between 4-amino-6-chloro-pyrimidines and functionalized aryl halides. The process, which employed a sacrificial iron anode in conjunction with a nickel(II) catalyst, allows the formation of coupling products in moderate to high yields.

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Reference:
Quinoxaline – Wikipedia,
Quinoxaline | C8H6N2 | ChemSpider

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: 19777-66-3, is researched, Molecular C3H12Cl2N2, about Synthesis of a water-soluble chiral NMR shift reagent: (S)-PDTA, the main research direction is alanine transformation chirality retention; PDTA water soluble chiral NMR shift reagent stereoselective preparation; propylenediamine tetraacetic acid stereoselective preparation.Reference of (S)-Propane-1,2-diamine dihydrochloride.

A five-step synthesis of the water-soluble chiral polydentate ligand, (S)-PDTA (I) starting from L-alanine has been worked out, via 5 steps with retention of chirality. The total yield is 50.7% (average of ∼88% for each step), while published methods report 33.4% total yield over four steps.

There is still a lot of research devoted to this compound(SMILES：C[C@H](N)CN.[H]Cl.[H]Cl)Reference of (S)-Propane-1,2-diamine dihydrochloride, and with the development of science, more effects of this compound(19777-66-3) can be discovered.

Reference:
Quinoxaline – Wikipedia,
Quinoxaline | C8H6N2 | ChemSpider

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: 19777-66-3, is researched, Molecular C3H12Cl2N2, about Synthesis of dexrazoxane, the main research direction is dexrazoxane synthesis diaminopropane.Application of 19777-66-3.

Dexrazoxane, a cardiac medicine, was synthesized in 35.7% overall yield starting from racemic 1,2-diaminopropane. The resolution of l,2-diaminopropane with D-(-)-tartaric acid followed by reaction with potassium chloride resulted in (S)-1,2-diaminopropane dihydrochloride, which was further converted into the title compound in two steps. The structure was confirmed with 1H NMR and IR.

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Reference:
Quinoxaline – Wikipedia,
Quinoxaline | C8H6N2 | ChemSpider

The three-dimensional configuration of the ester heterocycle is basically the same as that of the carbocycle. Compound: 1-(Bromomethyl)-4-ethylbenzene(SMILESS: CCC1=CC=C(CBr)C=C1,cas:57825-30-6) is researched.Category: indazoles. The article 《A convergent formal [4+2] cycloaddition of 1,6-diynes and benzyl azides: construction of spiro-polyheterocycles》 in relation to this compound, is published in Organic & Biomolecular Chemistry. Let’s take a look at the latest research on this compound (cas:57825-30-6).

A convergent formal [4+2] cycloaddition reaction for the construction of structurally appealing spiro-tetrahydroquinolines has been developed, in which, a one-pot reaction is established for the in situ generation of two reagents, a cyclic alkyne and an N-aryliminium ion, from the corresponding precursors in the presence of an Au-catalyst and Bronsted acid, resp.

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Reference:
Quinoxaline – Wikipedia,
Quinoxaline | C8H6N2 | ChemSpider

Liu, Yong-Hai; Li, Da-Li; Li, Qin-Hua; Yang, Jun-Fang; Lu, Lu-De published an article about the compound: 1-(Bromomethyl)-4-ethylbenzene( cas:57825-30-6,SMILESS:CCC1=CC=C(CBr)C=C1 ).Formula: C9H11Br. 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:57825-30-6) through the article.

A novel and convenient approach for the preparation of [3R-(3α,4β,5α,6β)]-2-[7-chloro-1-(4-ethylbenzyl)-5-methyl-1H-indol-3-yl]-6-(hydroxymethyl)tetrahydro-2H-pyran-3,4,5-triol starting from 7-chloro-5-methylindole by three steps was developed. The product was achieved in 72% yield.

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Reference:
Quinoxaline – Wikipedia,
Quinoxaline | C8H6N2 | ChemSpider