Aluminum (Al) is the third most common element in the Earth's crust, where it is present naturally in some 300 different feldspars, silicates, micas, and clays. Aluminum is a metallic element but is not found in nature in its metallic form. Aluminum is usually found in combination with othe...
Aluminum ion bioaccumulation is associated with the formation of β-amyloid peptide, a main microscopic characteristic of Alzheimer’s disease. β-amyloid affects glucose transport and consequently limits glycine synthesis. Glycine is an important amino acid in several body functions and it acts...
The air stable potassium vinyltrifluoroborate 1 was efficiently prepared in one step front vinyhnagnesium chloride and used in palladium cross-coupling reactions with arenediazoniunt salts affording functionalized styrenes.
An efficient heterogeneously palladium catalysed procedure for the vinylation of aryl iodides and bromides is reported. Using common reaction conditions (Pd/C 2 mol %, AcONa·3H2O, NMP or NMP/H2O), good to complete conversions (40–100%) with high selectivities (79–100%) towards the expected vi...
2H-Chromenes were synthesized from salicylaldehyde using potassium vinylic borates in the presence of secondary amines. We synthesized these 2H-chromene derivatives as a part of an ongoing project to develop inhibitors for TGF-β receptors. Potassium vinyl trifluoroborates react with salicylalde...
An initial study of the Suzuki–Miyaura cross-coupling of potassium vinyltrifluoroborate (2) and hindered aryl bromides is presented. Coupling of benzyl 3,5-bis(benzyloxy)-4-bromobenzoate (1) leads to a mixture of the desired styrene derivative, and the reduced product.
The Suzuki–Miyaura cross-coupling of sterically hindered and electron-rich ortho,ortho′-substituted aryl halides with potassium vinyltrifluoroborate utilizing microwave irradiation has been conducted while adjusting solvent ratio, irradiation time, and catalyst loading to find optimal conditio...
A collection of substituted potassium internal vinyltrifluoroborates was prepared and utilized in palladium-catalyzed cross-coupling reactions with aryl and heteroaryl halides. The cross-coupling reactions proceeded readily with Pd(PPh3)4 as a catalyst in toluene/H2O under reflux in the presence...
Cyanidation, a process used for over a century to extract gold from free milling ores, is so effective that it can economically treat low-grade ores (0.5 g/t Au). The concentration of cyanide added to dissolve gold is much higher than the stoichiometric requirement because of various interferenc...
Cuprous cyanide is widely present in electroplating wastewater or metallurgical effluents. In the present study, the destruction of Cu(CN)32− with H2O2 in water under alkaline conditions was investigated. H2O2 oxidized the cyanide from Cu(CN)32− to cyanate with the formation of Cu(CN)2− firstly....
Cyanide has been widely used as a depressant in sulphide mineral flotation. It occasionally activates mineral flotation as well. In addition, cyanide species in the water from gold cyanidation process may be recycled to flotation circuits and have an inadvertent effect on mineral flotation. Ther...
Metal recovery is an attractive strategy for treatment of heavy metal wastewater. Heavy metal cyanide complexes are common pollutants in electroplating or mine industry wastewater, which usually hinder metal recovery due to the high stability of these complexes. A novel electrochemical system wi...
In gold processing plants, the process water contains a considerable amount of weak acid dissociable (WAD) cyanide species. The cyanide-containing water recycled to flotation circuits has a deleterious effect on mineral flotation. Zinc cyanide can be a major constituent of the process water due ...
Batch flotation tests of a lead–zinc sulphide composite ore from the Rosh Pinah Mine have been carried out at pH 8.5 in the presence of copper cyanide complexes. These copper cyanide complexes are often found in the recycled water that is used in the milling and the lead flotation circuits. Flo...
At gold and silver mineral processing plants, cyanide species are always present in the process water recycled to flotation circuits, despite the cyanide destruction process. The effect of cyanide, in particular, cuprous cyanide on gold and silver flotation has not been well understood. In the p...
Herein, a simple and novel colorimetric method for detection of potassium ions (K+) was developed. The colorimetric experiments revealed that upon the addition of K+, the conformation of anti-K+ aptamer in solution changed from random coil structure to compact rigid G-quadruplex one. This compac...
In this work, we studied the feasibility of interaction among gold nanoparticles (AuNPs) and a cationic dye in an aptasensor system for the detection of potassium ions. The presence and absence of potassium in the solution was distinguishable by different colors (between orange and green) appear...
Electroless gold plating solution containing tetrachloroaurate and citrate ions together with urea is suggested that provides deposition of gold nonporous and adherent films ∼0.1 μm in thickness with a total surface area not less than 0.2 m2/l. The nature of gold reduction processes is studied...
Tetrathiafulvalene (TTF) based charge-transfer compounds are ideal as a transducer layer for a solid-contact ion-selective electrode (SC-ISE), because of their excellent ionic conductivity and high capacitance. Since nanomaterials with tailored geometries exhibit unique shape-dependent propertie...
A new kind of imidazole derivative, 4,5-diphenyl-2(E)-styryl-1H-imidazole, has been synthesized. UV–vis absorption and fluorescence spectral studies show the interaction of the imidazole derivative with anatase and rutile phases of nanocrystalline TiO2. Anatase quenches the fluorescence emissio...
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