Category: 1563-38-8

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N-methylcarbamate pesticides and their phenolic degradation products: hydrolytic decay, sequestration and metal complexation studies

We report on the rates of decomposition of a group of N-methylcarbamate (NMC) pesticides (carbaryl, carbofuran and propoxur) under pre-determined tropical field conditions. Rates of decomposition for three NMCs were determined at pH 7.08 and T = 20 C and pH 7.70 and T = 33 C respectively, as follows: carbaryl (78 days and 69 days); carbofuran (143 days and 83 days) and propoxur (116 days and 79 days). Investigation on methods for removal of NMCs and their phenolic decomposition products shows that activated charcoal outperforms zeolite, alumina, diatomaceous earth, cellulose and montmorillonite clay in the removal of both NMCs and phenols from aqueous solution. Furthermore, metal complexation studies on the NMCs and phenols showed that Fe (III) forms a complex with isopropoxyphenol (IPP) within which the Fe:IPP ratio is 1:3, indicative of the formation of a metal chelate complex with the formula Fe(IPP)3.

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Benzofuran – Wikipedia,
Benzofuran | C8H2407O – PubChem

Electric Literature of 1563-38-8, The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature.1563-38-8, Name is 2,2-Dimethyl-2,3-dihydrobenzofuran-7-ol, molecular formula is C10H12O2. In a Patent£¬once mentioned of 1563-38-8

2 – (Benzofuran -7 – oxy) – N’ – substituted aryl/alkyl formylcyanoacetylhydrazone derivative and its preparation method and application (by machine translation)

The present invention provides a compound of formula (I) indicated by the 2 – (benzofuran – 7 – yloxy) – N’ – substituted aryl/alkyl formylcyanoacetylhydrazone derivative and its preparation method and application, in the formula, R is selected from 4 – CN – C6 H4 , 4 – F – C6 H4 , 4 – Cl – C6 H4 , 4 – Br – C6 H4 , 3 – F – C6 H4 , 3 – Br – C6 H4 , 4 – NO2 – C6 H4 , 3 – NO2 – C6 H4 , 2 – Br – C6 H4 , 3 – CH3 – C6 H4 , 4 – CH3 – C6 H4 , 4 – OMe – C6 H4 , 3 – OMe – C6 H4 , 2 – OMe – C6 H4 , Phenyl, isopropyl, cyclohexane, styryl, furyl, thiophene base or naphthyl. The compounds of this invention and its pharmaceutically acceptable salt at a relatively low dosage, human breast cancer cells (MCF – 7), human cervical carcinoma cells (HeLa), human stomach cancer cell (MGC – 803), human lung adenocarcinoma cells (A549), human breast cancer cells (MDA – MB – 231) inhibitory activity, for the anti-tumor drug provides a new selection. (by machine translation)

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Benzofuran – Wikipedia,
Benzofuran | C8H2313O – PubChem

One of the major reasons for studying chemical kinetics is to use measurements of the macroscopic properties of a system, Product Details of 1563-38-8, such as the rate of change in the concentration of reactants or products with time.In a article, mentioned the application of 1563-38-8, Name is 2,2-Dimethyl-2,3-dihydrobenzofuran-7-ol, molecular formula is C10H12O2

Impact of incorporating substituents onto the P-o-anisyl groups of DiPAMP ligand on the rhodium(I)-catalyzed asymmetric hydrogenation of olefins

The introduction of 1,2-bis[(o-anisyl)-(phenyl)phosphino]ethane (DiPAMP) as a P-stereogenic ligand for rhodium(I)-catalyzed hydrogenation by Knowles et al. came after their evaluation of several diphosphines. However, no in-depth study was carried out on incorporating various substituents on its P-o-anisyl groups. In this work, we have prepared a large series of enantiopure and closely related DiPAMP analogues possessing various substituents (MeO, TMS, t-Bu, Ph, fused benzene ring) on the o-anisyl rings. The new ligands were evaluated in rhodium-catalyzed hydrogenation of several model substrates: methyl alpha-acetamidoacrylate, methyl (Z)-alpha-acetamidocinnamate, methyl (Z)-beta-acetamidocrotonate, dimethyl itaconate, and atropic acid. They displayed enhanced activities and increased enantioselectivities, particularly the P-(2,3,4,5-tetra-MeO-C6H)-substituted ligand (4MeBigFUS). Interestingly enough, 88% ee was obtained in the hydrogenation of atropic acid using the Rh-(4MeBigFUS) catalyst under mild conditions (10 bar H2, room temperature) versus 7% ee using Rh-DiPAMP. Conversely, the ligand possessing P-(2,6-di-MeO-C6H3) groups proved to slow down considerably the hydrogenation. X-Ray structures of their corresponding Rh complexes are presented and discussed.

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Benzofuran – Wikipedia,
Benzofuran | C8H2439O – PubChem

Synthetic Route of 1563-38-8, The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature.1563-38-8, Name is 2,2-Dimethyl-2,3-dihydrobenzofuran-7-ol, molecular formula is C10H12O2. In a Article£¬once mentioned of 1563-38-8

Pretreatment of water-based seed coating wastewater by combined coagulation and sponge-iron-catalyzed ozonation technology

Coagulation?sedimentation combined with sponge iron/ozone (CS-SFe/O3) technology was applied to pretreat water-based seed coating wastewater (WSCW) from pesticide manufacturing. Coagulation with polyferric sulfate at a dosage of 1.5 g L?1 and a pH of 8.0 was effective, with color and chemical oxygen demand (COD) removal rates of 96.8 and 83.4%, respectively. SFe/O3 treatment further reduced the organic content in the effluents, especially concerning the degradation of aromatic pollutants, as demonstrated via ultraviolet?visible spectrophotometry (UV?vis), excitation-emission matrix (EEM) fluorescence spectrometry, and gas chromatography-mass spectrometry (GC/MS) analyses. The residual color and COD values of the effluent were 581.0 times and 640.0 mg L?1, respectively, under optimal conditions (ozone concentration of 0.48 mg L?1, SFe dosage of 20.0 g L?1, initial pH of 9.0, and reaction time of 30 min). Organic pollutants were also degraded by the high amounts of HO[rad], which may have been generated via the transformation of ozone into HO[rad] on the SFe’s surface and in the solution. Meanwhile, the biochemical oxygen demand (BOD5)/COD ratio of the WSCW increased, which indicates that the biodegradability improved significantly. The amount of iron leached from SFe particles was 4.5 mg L?1, which shows that the SFe catalyst has good stability. The operating cost of the combined CS-SFe/O3 technology was estimated at approximately 2.79 USD t?1. The results of this study suggest that the application of the combined CS-SFe/O3 technology in WSCW pretreatment can be beneficial for removing suspended solids, degrading recalcitrant pollutants, and enhancing biodegradability for the subsequent bioprocessing treatment.

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Benzofuran – Wikipedia,
Benzofuran | C8H2428O – PubChem

In heterogeneous catalysis, the catalyst is in a different phase from the reactants. Application In Synthesis of 2,2-Dimethyl-2,3-dihydrobenzofuran-7-ol, At least one of the reactants interacts with the solid surface in a physical process called adsorption in such a way. 1563-38-8, name is 2,2-Dimethyl-2,3-dihydrobenzofuran-7-ol. In an article£¬Which mentioned a new discovery about 1563-38-8

Chemical models of cytochrome P450 catalyzed insecticide metabolism. Application to the oxidative metabolism of carbamate insecticides

Cytochrome P450 (CP450) catalyzed oxidative metabolism of carbofuran (1), carbaryl (2), and pirimicarb (3) has been modeled using biomimetic oxidations catalyzed by iron(III) tetraarylporphyrins. Oxidation products of 1 were identified by comparison of HPLC retention times measured under standardized conditions for metabolites synthesized and characterized by 1H and 13C NMR spectroscopy. Comparison of product distributions to in vivo metabolic profiles revealed that the H2O2/meso- tetrakis(pentafluorophenyl)porphyrin iron(III) chloride [Fe(TF20PP)] system mimics the action of insect CP450s against carbofuran. The effectiveness of this system was further demonstrated by the biomimetic oxidation of other carbamate insecticides (2 and 3) monitored by HPLC/electrospray MS. The predictive power of this biomimetic model was compared to that of knowledgebased expert systems. Although similar models were recently applied in pharmaceutical research, the usefulness of this approach has first been demonstrated for the prediction of metabolic profiles of agrochemicals.

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Benzofuran – Wikipedia,
Benzofuran | C8H2375O – PubChem

One of the major reasons for studying chemical kinetics is to use measurements of the macroscopic properties of a system, SDS of cas: 1563-38-8, such as the rate of change in the concentration of reactants or products with time.In a article, mentioned the application of 1563-38-8, Name is 2,2-Dimethyl-2,3-dihydrobenzofuran-7-ol, molecular formula is C10H12O2

Hair analysis for the biomonitoring of pesticide exposure: comparison with blood and urine in a rat model

Urine and plasma have been used to date for the biomonitoring of exposure to pollutants and are still the preferred fluids for this purpose; however, these fluids mainly provide information on the short term and may present a high level of variability regarding pesticide concentrations, especially for nonpersistent compounds. Hair analysis may provide information about chronic exposure that is averaged over several months; therefore, this method has been proposed as an alternative to solely relying on these fluids. Although the possibility of detecting pesticides in hair has been demonstrated over the past few years, the unknown linkage between exposure and pesticides concentration in hair has limited the recognition of this matrix as a relevant tool for assessing human exposure. Based on a rat model in which there was controlled exposure to a mixture of pesticides composed of lindane, beta-hexachlorocyclohexane, beta-endosulfan, p,p?-DDT, p,p?-DDE, dieldrin, pentachlorophenol, diazinon, chlorpyrifos, cyhalothrin, permethrin, cypermethrin, propiconazole, fipronil, oxadiazon, diflufenican, trifluralin, carbofuran, and propoxur, the current work demonstrates the association between exposure intensity and resulting pesticide concentration in hair. We also compared the results obtained from a hair analysis to urine and plasma collected from the same rats. Hair, blood, and urine were collected from rats submitted to 90-day exposure by gavage to the aforementioned mixture of common pesticides at different levels. We observed a linear relationship between exposure intensity and the concentration of pesticides in the rats? hair (RPearson 0.453?0.978, p?SDS of cas: 1563-38-8, If a proposed mechanism predicts the wrong experimental rate law, however, the mechanism must be incorrect.Welcome to check out more blogs about 1563-38-8, in my other articles.

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Benzofuran – Wikipedia,
Benzofuran | C8H2336O – PubChem

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Selective amperometric flow-injection analysis of carbofuran using a molecularly-imprinted polymer and gold-coated-magnetite modified carbon nanotube-paste electrode

Herein, we propose a new approach for selective determination of carbofuran (CBF) in vegetables, based on a simple flow-injection system using a molecularly-imprinted amperometric sensor. The sensor design is based on a carbon-paste electrode decorated with carbon nanotubes and gold-coated magnetite (CNTs-Fe3O4@Au/CPE) coated with a molecularly-imprinted polymer (MIP) for CBF sensing. The MIP was synthesized on the electrode surface by electropolymerization using a supramolecular complex, namely 4-ter-butylcalix [8] arene-CBF (4TB[8]A-CBF), as the template. We used o-phenylenediamine as the functional monomer. Our results demonstrate that incorporation of the MIP coating improves the electrochemical catalytic properties of the electrode, increases its surface area, and increases CBF selectivity by modulating the electrical signal through elution and re-adsorption of CBF. The imprinted sensor (MIP-CNTs-Fe3O4@Au/CPE) was used in a flow-injection analysis (FIA) system. Experimental conditions were investigated in amperometric mode, with the following optimized parameters: phosphate buffer solution (0.1 M, pH 8.0) as the carrier, flow rate 0.5 mL min?1, applied potential +0.50 V. When used in the FIA system, the designed imprinted sensor yields a linear dynamic range for CBF from 0.1 to 100 muM (r2 = 0.998) with a detection limit of 3.8 nM (3Sb), and a quantification limit of 12.7 nM (10Sb). The sensor exhibits acceptable precision (%RSD = 4.8%) and good selectivity toward CBF. We successfully applied the electrode to detect CBF in vegetable samples.

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Benzofuran – Wikipedia,
Benzofuran | C8H2334O – PubChem

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Hydrogen-atom transfer reactions from ortho-alkoxy-substituted phenols:An experimental approach

The role of intramolecular hydrogen bonding (HB) on the bond-dissociation enthalpy (BDE) of the phenolic O-H and on the kinetics of H-atom transfer to peroxyl radicals (kinb) of several 2-alkoxyphenols was experimentally quantified by the EPR equilibration technique and by inhibited autoxidation studies. These compounds can be regarded as useful models for studying the H-atom abstraction from 2-OR phenols, such as many lignans, reduced coenzyme Q and curcumin. The effects of the various substituents on the BDE(O H) of 2-methoxy, 2-methoxy-4-methyl, 2,4-di-methoxyphenols versus phenol were measured in benzene solution as -1.8; -3.7; – 5.4 kcalmol-1, respectively. In the case of polymethoxyphenols, significant deviations from the BDE(OH) values predicted by the additive effects of the substituents were found. The logarithms of the kinh constants in cumene were inversely related to the BDE(O-H) values, obeying a linear Evans-Polanyi plot with the same slope of other substituted phenols and a y-axis intercept slightly smaller than that of 2,6-dimethyl phenols. In the cases of phenols having the 2-OR sub-stituent included in a five-membered condensed ring (i.e, compounds 9-11), 11both conformational isomers in which the OH group points toward or away from the oxygen in position 2 were detected by FTIR spectroscopy and the intramolecular HB strength was thus estimated. The contribution to the BDE(O-H) of the ortho-OR substitu-ent in 9, corrected for intramolecular HB formation, was calculated as -5.6 kcal mol-1. The similar behaviour of cyclic and non-cyclic ortho-alkoxy derivatives clearly showed that the preferred conformation of the OMe group in ortho-methoxyphenoxyl radicals is that in which the methyl group points away from the phenoxyl oxygen, in contrast to the geometries predicted by DFT calculations.

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Benzofuran – Wikipedia,
Benzofuran | C8H2335O – PubChem

Application of 1563-38-8, A catalyst don’t appear in the overall stoichiometry of the reaction it catalyzes, but it must appear in at least one of the elementary reactions in the mechanism for the catalyzed reaction. 1563-38-8, Name is 2,2-Dimethyl-2,3-dihydrobenzofuran-7-ol, molecular formula is C10H12O2. In a Article£¬once mentioned of 1563-38-8

Synthesis of the Cyclopropabenzofuran System of Mycorrhizin A and of Gilmicolin from a Benzofuranol. Crystal Structure of a 5,8-Methanocyclopropanaphto<2,3-b>furan Derivative

The cyclopropabenzofuran derivative (17), which contains the structural features of methyl ethers of mycorrhizin A and gilmicolin save for the C3 side chain, has been synthesized from the benzofuranol (4) trough the benzofuran-4,7-dione (5) and the 7a-methoxy derivative (8).The cyclopropane ring of (17) was introduced by ultraviolet irradiation of a 1-pyrazoline (13) at -78 deg; irradiation at room temperature gave mainly a profoundly rearranged acidic product for which the methanoindenone structure (18) is proposed.The stereochemistry of the penultimate cyclopropane (16) has been established X-ray crystallography.

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Benzofuran – Wikipedia,
Benzofuran | C8H2345O – PubChem

Application of 1563-38-8, Chemistry is the experimental science by definition. We want to make observations to prove hypothesis. For this purpose, we perform experiments in the lab. 1563-38-8, Name is 2,2-Dimethyl-2,3-dihydrobenzofuran-7-ol,introducing its new discovery.

Metal-assembled compounds: Precursors of polymerization catalysts and new materials

Selected results of our recent research on titanium, zirconium, hafnium and magnesium chloride and oxygen-based metal-assembled compounds are summarized from the perspective of these metals acting as catalysts for olefin polymerization. This paper discusses our studies on the isolation of various metal-assembled compounds, the determination of their structures by X-ray crystallography and the relationship of their polynuclear structures to their activity as polymerization catalysts as well as to the field of molecule-functional-based materials. As we demonstrate here, our attempts to prepare new metal-assembled pre-catalysts and to understand the chemistry of formation of these new complexes often led to unexpected reactions, which could be applied to syntheses of well-defined heterogeneous olefin polymerization catalysts.

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Benzofuran – Wikipedia,
Benzofuran | C8H2414O – PubChem