Có 220+ tài liệu thuộc chủ đề "Journal of Chemistry"
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15 To obtain monobromides and 8, 16,18 n-BuLi was added to a solution of the alkene and t -BuOK in THF, followed by trapping with DBTCE. In a further step, to deprotonate monobromides, LDA was added to a solution of monobromide in THF and the solution was treated with DBTCE to give dibromides and 9 16 (Scheme 1).. Synthesis of...
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Abstract: Bacterial infections in medical devices and drug resistance of bacteria can cause chaos in the world due to loss of lives in addition to the cost of device revisions, quarantine, disinfection of infected areas, and patient treatment.. Herein, we examine for the first time the fabrication and characterization of radio frequency (RF) plasma polymerized hydrophilic thin films from linalool...
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Abstract: The M2 protein of the influenza A virus, responsible for flu, is a homotetramer transmembrane protein, forming a transmembrane ion channel, where His 37s act as pH sensors and Trp 41s and Asp 44s act as channel gates.. Upon binding of the inhibitor molecules, decrease in ion channel cross-distances was observed. The first 23 amino acids of the N-terminal...
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doi:10.3906/kim-1808-26 h t t p. Comparative phytochemical investigation was carried out on the ethyl acetate and methanol extracts of the plant. The extracts of the aerial parts of Tanacetum mucroniferum yielded three new sesquiterpene lactones and some known compounds, namely two sesquiterpene lactones, six flavonoids, three coumarins, and one triterpene. of the family Asteraceae is represented in Turkey by 60...
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Preparation of α-hydroxyphenylacetic acid with cyclodextrins as an effective phase-transfer catalyst and its reaction mechanism. Abstract: An effective procedure for the synthesis of α -hydroxyphenylacetic acid with cyclodextrin (CD) catalysts was developed. The phase-transfer catalyst types, catalyst loadings, reaction times, reaction temperatures, and substrate molar ratios were investigated to optimize the reaction conditions. In addition, the factors that affect the...
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Progress in the chemistry of 3-amino-9-ethylcarbazole. Abstract: Generally, 3-amino-9-ethylcarbazole is considered a versatile compound not only for its unique electronic properties but also for its significance as a building block in synthetic, pharmaceutical, and material chemistry. The synthesis, chemical reactivity, and applications of 3-amino-9-ethylcarbazole are described in this review. The presence of the amino group at position 3 exhibits a...
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Environment conditions that allow the protein to stay in its native state are called physiological conditions and the native state corresponds, by definition, to the free energy minimum of the system under those given thermodynamic conditions (e.g., temperature, pressure, solutes, type of solvent and solvent conditions, 1 − 4 and protein concentrations). The energy landscape of a protein is dynamic,...
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1 H NMR (300 MHz, DMSO- d 6 ) (δ , ppm): 7.58 (dd, J 1 = 9, J 2 = 2.5 Hz, 1H), 7.67 (d, J = 8.4 Hz, 2H), 7.68 (d, J = 9 Hz, 1H), 7.93 (d, J = 2.5 Hz, 1H), 8.85 (d, J = 8.4 Hz, 2H). δ, ppm): 7.39 (d, J = 9 Hz,...
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Spectrophotometric methods for the determination of fluoride ion using indole-3-acetic acid interaction with iron(III). Abstract: This study is related to the determination of fluoride ion by the conversion of pink-colored Fe(III) and indole- 3-acetic acid (IAA) into a colorless hexafluoride ferrite complex with the addition of fluoride. The optimum conditions of the complex formation were found to be pH 1.7...
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The soil burial test method, CO 2 evolution analysis, weight loss, mechanical properties, and average molecular weight measurements and analysis of surface morphological changes were performed for biodegradability evaluation of the modified PP fibers. Surface morphology of the blend fibers illustrated that by increasing the soil burial period cracks were formed on the surfaces of fibers. While different testing methods...
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Abstract: A new heterogeneous acid catalyst based on a natural resource, Tunisian clay (Clay-H0.5), has been prepared and characterized by FT-IR, FE-SEM, and powder X-ray diffraction (XRD), as well as chemical composition, cation exchange capacity, specific surface area, and pore volume. This achieved up to 92% isolated yield for only 10 wt.% of the catalyst. Importantly, the Clay-H0.5 catalyst showed...
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When the diisocyanate content was increased, deconvolution results of FTIR-ATR in C =O and N-H regions demonstrated better miscibility of the segments and XRD results showed a significant decrease in the crystallinity of soft segments. Flexible macrochains of polyols have low glass transition temperature (T g ) values and form the soft segments (SS), while hydrogen bonded urethane groups form...
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Boric acid as an efficient and green catalyst for the synthesis of. 2-amino-4,6-diarylnicotinonitrile under microwave irradiation in solvent-free conditions. Abstract: Microwave irradiation has been used to improve the one-pot synthesis of substituted 2-amino-4,6-diarylnicoti- nonitrile in the presence of boric acid as an efficient and green catalyst under solvent-free conditions within 48–60 s. All the analogs that have not been reported...
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Abstract: In this study, conversion of seaweeds into hydrochars was investigated with the aim of obtaining a renewable energy feedstock. Fuel characteristics and chemical properties of the derived hydrochars were determined using the standard fuel analysis and spectroscopic methods. The combustion behavior of seaweeds and hydrochars was examined via nonisothermal thermogravimetric analysis under air atmosphere. The seaweed-derived hydrochar yields were...
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Abstract: In this study, titanium dioxide was synthesized via solution combustion method. Structural properties of the final product were characterized by p-XRD. The synthesized products were compared to the commercial TiO 2 and it was found that the titanium dioxide with the high surface area (63.628 m 2 /g) has been successfully synthesized by solution combustion method with time and...
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Synthesis, kinetic study, and reaction mechanism: nucleophilic substitution reactions of butyl methyl chlorophosphate with substituted anilines and. Abstract: This study demonstrated the kinetics of nucleophilic substitution reactions of butyl methyl chlorophosphate (2) with X-anilines (XC 6 H 4 NH 2 ) and deuterated X-anilines (XC 6 H 4 ND 2 ) in MeCN at C together with the general optimized...
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Investigation of the ideal composition of metal hexacyanocobaltates with high water oxidation catalytic activity. A series of mixed-metal cobalt-iron hexacyanocobaltates has also been studied to determine the ideal composition of a metal hexacyanocobaltate for electrocatalytic water oxidation process. 1 − 4 Water oxidation, the half reaction of water splitting, is considered to be one of the main challenges in this...
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Pore length- and ion concentration-dependent ionic current in cylindrical nanopores: an atomistic molecular dynamics study. The approach is simply based on the detectable temporary blockades in the ionic current as the molecules pass through the nanopores. These signatures of the current have been shown to be a function of nanoparticle and nanopore size and geometry as well as the external...
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Design, synthesis, and evaluation of the antimycobacterial activity of 3-mercapto-1,2,4-triazole–pyrrole hybrids. Abstract: A series of 3-mercapto-1,2,4-triazole–pyrrole hybrids was designed as antimycobacterial agents by employing 5- (4-(1 H -pyrrol-1-yl)phenyl)-4 H -1,2,4-triazole-3-thiol as the scaffold onto which several types of moieties were introduced in the triazole ring at N-4 and N-2 and as substituents of the mercapto function. Investigation of the compounds...
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A fast and convenient analysis method for the determination of cations in pomegranate juices by capillary electrophoresis with contactless conductivity. In this study, a rapid, economic, reliable, and applicable capillary electrophoresis method was proposed with contactless conductivity detection for the quantitative determination of six cations in different pomegranate juices. The correlation between these cation contents of eight different pomegranate juices...