Month: April 2022

The preparation of ester heterocycles mostly uses heteroatoms as nucleophilic sites, which are achieved by intramolecular substitution or addition reactions. Compound: 2-Mercapto-5-methylbenzimidazole( cas:27231-36-3 ) is researched.Synthetic Route of C8H8N2S.Raditoiu, Valentin; Wagner, Luminita; Raditoiu, Alina; Ardeleanu, Petrea; Grigoriu, Nicoleta; Tarabasanu-Mihaila, Corneliu published the article 《Heterocyclic dyes with condensed rings derived from 1,3-dihydro-2H-benzimidazole-2-thiones. Benzimidazo[2,1-b]naphtho[2,3-d]thiazole-7,12-diones》 about this compound( cas:27231-36-3 ) in Revista de Chimie (Bucharest, Romania). Keywords: benzimidazonaphthothiazoledione dye preparation chloronaphthoquinone cyclocondensation benzimidazothione. Let’s learn more about this compound (cas:27231-36-3).

Seven new benzimidazo[2,1-b]naphtho[2,3-d]thiazole-7,12-dione dyes have been synthesized by cyclocondensation of 2,3-dichloro-1,4-naphthoquinone with some 1,3-dihydro-2H-benzimidazole-2-thione derivatives The reaction products were purified and characterized by means of elemental anal., UV-VIS, IR, and 1H- and 13C-NMR spectra, and thermal anal. Structure-property relationships in the dyes are discussed with respect to the nature of the substituents in the benzimidazole moieties.

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Reference:
Benzoxazole – Wikipedia,
Benzoxazole | C7H5NO – PubChem

Reference of 1,4,7,10,13-Pentaoxa-16-azacyclooctadecane. 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: 1,4,7,10,13-Pentaoxa-16-azacyclooctadecane, is researched, Molecular C12H25NO5, CAS is 33941-15-0, about Covalently decorated crown ethers on magnetic graphene oxides as bi-functional adsorbents with tailorable ion recognition properties for selective metal ion capture in water. Author is Nisola, Grace M.; Parohinog, Khino J.; Cho, Min Kyung; Burnea, Francis Kirby B.; Lee, Jin Yong; Seo, Jeong Gil; Lee, Seong-Poong; Chung, Wook-Jin.

Metal ions (Mn+) in water are considered as environmental pollutants, as industrial impurities or as potential secondary sources for valuable metals. Increasing generation of complex feed streams has raised the need for more specialized adsorbents that could preferentially capture the target Mn+. While graphene oxide (GO) is an effective adsorbent, its indiscriminate sequestration neg. affects its selectivity. To meet the growing demand for more Mn+-selective materials, GO adsorbents with dual features of ion recognition and magnetic responsiveness were developed. The bi-functional GOs were fabricated by in-situ nucleation of Fe3O4 nanoclusters on GO oxygenous groups and by direct grafting of ethynylbenzene linkers on its backbone, which served as tethering sites for the macrocyclic crown ether (CEs) ligands with tunable Mn+ affinities (i.e. CE@Fe3O4-rGO). As proof-of-concept, 12CE4@Fe3O4-rGO was proven highly selective for Li+ capture, achieving α = 367-14,513 against Na+, K+, Mg2+, Ca2+ in seawater. Its Langmuir-type Li+ adsorption achieved nearly ∼100% 12CE4 utilization (1.03 mmol g-1 CE loading). Its pseudo-second uptake rate demonstrated its rapid Li+ capture. 12CE4@Fe3O4-rGO is water-dispersible, magnetically retrievable, and recyclable with consistent Li+ uptake performance. By replacing the CEs with aza15CE5, aza18CE6 and dibenzo-24CE8, three more types of CE@Fe3O4-rGOs (1.24-1.71 mmol CE g-1) were successfully synthesized with varying affinities towards heavy metals, radionuclides and alkali metal ions. These findings highlight the versatility of the proposed technique in producing a wide selection of CE@Fe3O4-rGOs which can be used for selective Mn+ capture in various application for water decontamination, salts removal, and resource recovery.

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Reference:
Benzoxazole – Wikipedia,
Benzoxazole | C7H5NO – PubChem

The preparation of ester heterocycles mostly uses heteroatoms as nucleophilic sites, which are achieved by intramolecular substitution or addition reactions. Compound: 1-(Furan-2-yl)propan-1-one( cas:3194-15-8 ) is researched.Recommanded Product: 1-(Furan-2-yl)propan-1-one.Guillen, Maria D.; Manzanos, Maria J. published the article 《Smoke and liquid smoke. Study of an aqueous smoke flavouring from the aromatic plant Thymus vulgaris L》 about this compound( cas:3194-15-8 ) in Journal of the Science of Food and Agriculture. Keywords: thyme smoke flavor composition. Let’s learn more about this compound (cas:3194-15-8).

An aqueous smoke flavoring from Thymus vulgaris L was obtained. The qual. and quant. composition of its dichloromethane extract was studied by gas chromatog. and gas chromatog./mass spectrometry. In addition to the common smoke components such as aldehydes, ketones, diketones, esters, acids, furan and pyran derivatives, alkyl aryl ethers, phenol, guaiacol and syringol derivatives, some terpenic compounds were detected. Differences between this aqueous liquid smoke and others from various kinds of wood are due not only to the absence or presence of some compounds but also to the proportions of the different groups of components present in the mixture Some aldehydes, esters, guaiacol and its derivatives and terpenic compounds contribute to the overall odor of this liquid smoke more significantly than the ketones, furan and pyran derivatives, acids, phenol and its derivatives and syringol. The yield in smoke components obtained from the pyrolysis of Thymus vulgaris L at 488°C is of a similar order to that obtained from other woods.

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Reference:
Benzoxazole – Wikipedia,
Benzoxazole | C7H5NO – PubChem

COA of Formula: C8H8N2S. Aromatic compounds can be divided into two categories: single heterocycles and fused heterocycles. Compound: 2-Mercapto-5-methylbenzimidazole, is researched, Molecular C8H8N2S, CAS is 27231-36-3, about New spectrophotometric method for the determination of Hg(II) in fish samples. Author is Martiniano, Lorena Carvalho; Bezerra, Cicero Welligton Brito; Marques, Edmar Pereira; Gouveia de Sousa, Antonio; Fernandes, Ridvan Nunes; Marques, Aldalea Lopes Brandes.

A simple, rapid, sensitive, and selective spectrophotometric method was developed for the determination of mercury at trace levels using 2-mercapto-5-methylbenzimidazole (MMBI). The color product (λmax = 320 nm) is formed in aqueous 0.04 M Britton-Robinson buffer pH 8.0 instantly and its absorbance remains stable for >24 h. Mercury nitrate dihydrate (Hg(NO3)2.2H2O) was used as standard analyte. The average molar absorption coefficient is 2.71 × 104 L/mol.cm. The chelate stoichiometric composition (Hg:MMBI) is 1:1. Considerable excesses of copper, zinc, lead, and cadmium did not interfere in the assay. The method allows determination of mercury in the range of 2 × 10-6 to 4 × 10-5 mol/L with good precision and accuracy; the detection limit was 9.9 × 10-7 mol Hg/L. The method was used for anal. of fish samples and the results were compared with at. absorption spectrometry data. The relative standard deviations for the analyzed samples were 7.2-33% (n = 5), while the Errors were 1.63-11.6.

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Reference:
Benzoxazole – Wikipedia,
Benzoxazole | C7H5NO – PubChem

SDS of cas: 6797-13-3. 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: 2-Ethylbenzo[d]oxazole, is researched, Molecular C9H9NO, CAS is 6797-13-3, about Graphene oxide as a heterogeneous reagent promoted synthesis of 2-substituted 1,3-benzazoles in water. Author is Khalili, Dariush; Banazadeh, Ali Reza.

An efficient chem. method for the synthesis of benzimidazoles, benzothiazoles, and benzoxazoles has been developed through the condensation of various aldehydes with o-phenylenediamine, o-aminothiophenol, and o-aminophenol using graphene oxide (GO) as an oxidant in water. These benzazoles are also prepared through a one-pot oxidation/condensation tandem process by reacting alcs. with 2-amino-(thio)phenol/aniline in the presence of GO in poly(ethylene glycol) as a safe media. Moreover, this carbonaceous material could be readily separated using a simple filtration.

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Reference:
Benzoxazole – Wikipedia,
Benzoxazole | C7H5NO – 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: 2-Mercapto-5-methylbenzimidazole, is researched, Molecular C8H8N2S, CAS is 27231-36-3, about Corrosion inhibition of steel in crude oil storage tanks.Related Products of 27231-36-3.

The corrosion behavior of steel in water from certain oil fields with various organic inhibitors was studied by applying potentiodynamic technique at pH 5.9. The inhibitors which were used include 2-methylbenzimidazole (I), 2-mercaptobenzimidazole (II), 2-mercapto-5-methylbenzimidazole (III), and 2-mercaptothiazole (IV). The inhibiting efficiency of the different additives was evaluated from their anodic and cathodic polarization curves at different temperatures A comparative study of curve fitting procedures using the kinetic thermodn. model and those utilizing well-known adsorption isotherms was undertaken. Three types of isotherms were used, Langmuir, Frumkin and Flory-Huggins isotherm. The kinetic-thermodn. model and Flory-Huggins isotherms are more suitable to fit the data for the four inhibitors, at all applied temperatures From the values of binding constants, K, the order of inhibitor efficiency is: III > IV > II > I. And thus 2-mercapto-5-methylbenzimidazole was the most effective inhibitor. The thermodn. parameters obtained for all the compounds used showed low values of Hads, which indicates that the action of these inhibitors is phys. adsorptive in nature.

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Reference:
Benzoxazole – Wikipedia,
Benzoxazole | C7H5NO – PubChem

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 Expeditious and efficient synthesis of benzoxazoles, benzothiazoles, benzimidazoles catalyzed by Ga(OTf)3 under solvent-free conditions, published in 2011-08-31, which mentions a compound: 6797-13-3, Name is 2-Ethylbenzo[d]oxazole, Molecular C9H9NO, Computed Properties of C9H9NO.

A new and efficient method for the synthesis of benzoxazoles, benzothiazoles, benzimidazoles by cyclocondensation of o-substituted aminoaroms. with ortho esters in the presence of catalytic amounts of Ga(OTf)3 under solvent-free conditions is presented. The remarkable features of this new protocol are high conversion, very short reaction times, cleaner reaction profiles under solvent-free conditions, straightforward procedure, and use of a relatively non-toxic catalyst.

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Reference:
Benzoxazole – Wikipedia,
Benzoxazole | C7H5NO – 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, Article, Chemical Communications (Cambridge, United Kingdom) called Enantioselective aryl-aryl coupling facilitated by chiral binuclear gold complexes, Author is Himmelstrup, Jonas; Buendia, Mikkel B.; Sun, Xing-Wen; Kramer, Soeren, which mentions a compound: 503538-69-0, SMILESS is FC1(F)OC2=CC=C(P(C3=CC=CC=C3)C4=CC=CC=C4)C(C5=C6OC(F)(F)OC6=CC=C5P(C7=CC=CC=C7)C8=CC=CC=C8)=C2O1, Molecular C38H24F4O4P2, Recommanded Product: 503538-69-0.

Herein, we report stoichiometric investigations embodying the first highly enantioselective aryl-aryl coupling facilitated by a gold complex. With up to 91% ee, this is the first demonstration of a transmetalation and C(sp2)-C(sp2) reductive elimination sequence with high enantioselectivity using a gold complex. The results offer a basis for development of enantioselective gold-catalyzed aryl-aryl coupling reactions.

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Reference:
Benzoxazole – Wikipedia,
Benzoxazole | C7H5NO – 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, Polymer Testing called High-density polyethylene as phase-change material: Long-term stability and aging, Author is Weingrill, H. M.; Resch-Fauster, K.; Lucyshyn, T.; Zauner, C., which mentions a compound: 27231-36-3, SMILESS is SC1=NC2=CC(C)=CC=C2N1, Molecular C8H8N2S, Recommanded Product: 27231-36-3.

Bulky high-d. polyethylene (HDPE) specimens containing different stabilization systems are exposed in air for up to 7200 h in the melt state to investigate the HDPE′s applicability as phase change material (PCM). Their thermo-oxidative stability is investigated. The maintenance of the storage capacity (heat of fusion) and the HDPE′s degradation behavior is monitored via Differential Scanning Calorimetry (DSC). Different aging phenomena of the thermo-oxidative exposure are investigated in more detail by means of Fourier-transform IR spectroscopy (FTIR) and polarized light microscopy (PLM). Only a small loss in the storage capacity upon thermo-oxidative exposure is detected. Therefore, HDPE proves to be a candidate material for polymeric PCM.

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Reference:
Benzoxazole – Wikipedia,
Benzoxazole | C7H5NO – PubChem

Jeulin, Severine; Duprat de Paule, Sebastien; Ratovelomanana-Vidal, Virginie; Genet, Jean-Pierre; Champion, Nicolas; Dellis, Philippe published the article 《Difluorphos, an electron-poor diphosphane: A good match between electronic and steric features》. Keywords: benzodioxole diphosphinylbis preparation geometry acidity chiral ligand asym hydrogenation; ketone fluorinated asym hydrogenation; alc beta functionalized asym synthesis; rhodium complex diphosphine IR spectra; diphosphine atropisomeric dihedral angle; diselenide atropisomeric diphosphine NMR spectra.They researched the compound: (R)-5,5′-Bis(diphenylphosphino)-2,2,2′,2′-tetrafluoro-4,4′-bi-1,3-benzodioxole( cas:503538-69-0 ).Synthetic Route of C38H24F4O4P2. 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:503538-69-0) here.

Both enantiomers of difluorphos I were synthesized and their stereoelectronic features were evaluated in theor. and exptl. studies. The unusual π acidity of I explains the excellent results obtained with it in ruthenium-mediated asym. hydrogenation of fluorinated β-functionalized ketones. These results are better than those obtained with other biphenyl-based diphosphines.

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Reference:
Benzoxazole – Wikipedia,
Benzoxazole | C7H5NO – PubChem