40 results about "Silver tetrafluoroborate" patented technology

Methods for separating di-olefins from mono-olefins, and olefins from non-olefins such as paraffins, oxygenates and aromatics; are provided. The methods use metal salts which complex both mono-olefins and di-olefins, but which selectively complex di-olefins in the presence of mono-olefins. The metal salts are dissolved or suspended in ionic liquids, which tend to have virtually no vapor pressure. Preferred salts are Group IB salts, more preferably silver and copper salts. A preferred silver salt is silver tetrafluoroborate. A preferred copper salt is silver CuOTf. Preferred ionic liquids are those which form stable solutions, suspensions or dispersions of the metal salts, which do not dissolve unwanted non-olefins, and which do not isomerize the mono- or di-olefins. The equivalents of the metal salt can be adjusted so that di-olefins are selectively adsorbed from mixtures of mono- and di-olefins. Alternatively, both mono- and di-olefins can be adsorbed, and the mono-olefins selectively desorbed. The latter approach can be preferred when non-olefins are also to be separated. The mono- and di-olefin-containing mixture can be in the gas phase or in the liquid phase. The flow of mono- and di-olefin-containing mixture over/through the ionic liquid can be, for example, co-current, counter-current, or staged in stirred tanks, with countercurrent being preferred.

The invention discloses a preparation method of antibacterial polyester fabrics and belongs to the technical field of textile materials. The preparation method comprises the following steps: after sequentially carrying out continuous modification treatment on polyester fabric original samples including clothing, tablecloth and curtains by virtue of a Na2CO3 solution, a mixed solution of alizarin red and sodium cyclamate, a mixed solution of aniline, hydrochloride and ammonium persulfate, a mixed solution of DL-mercaptosuccinic acid and D-penicillamine and a nano-silver solution, putting the treated polyester fabric original samples into a silver tetrafluoroborate aqueous solution, carrying out reaction at room temperature for 30 minutes, washing the product by a great deal of water, and drying at the temperature of 40 DEG C to obtain the antibacterial polyester fabrics. The antibacterial polyester fabrics prepared by the preparation method have the broad-spectrum antibacterial property, are good in antibacterial effect particularly on staphylococcus aureus, bacillus subtilis, Escherichia coli and pseudomonas aeruginosa, are strong in persistence and have the single-strain inhibitory rate reaching 95-99.7 percent after being washed for 30 times.

The invention discloses a preparation method of vinorelbine. The method comprises the following steps: taking anhydrovinblastine as a raw material; performing a bromination reaction to prepare bromide; and then performing separation by alumina column chromatography. The bromide is condensed and cyclized to vinorelbine during a column chromatographic separation process without using silver tetrafluoroborate and tetrahydrofuran, and product purity can be up to 65% (HPLC). The method helps avoid using the expensive silver tetrafluoroborate reagent, shorten process flow, lower raw material cost and reduce environmental pollution; meanwhile, the method also helps solve the disadvantages of unstable product quality, yield and the like in a silver tetrafluoroborate process and has good popularization and application prospect.

Various processes are disclosed for preparing procyanidin oligomers having (4,8)-interflavan linkages. In an improved process, a tetra-O-protected-epicatechin or catechin monomer or oligomer is coupled with a protected, C-4 alkoxy-activated-epicatechin or -catechin monomer in the presence of an acidic clay instead of a Lewis acid. In a second process, a 5,7,3′,4′-tetra-O-protected or preferably penta-O-protected-epicatechin or -catechin monomer or oligomer is reacted with a tetra-O-protected or preferably penta-O-protected-epicatechin or -catechin monomer having a thio activating group at the C-4 position; the coupling is carried out in the presence of silver tetrafluoroborate. In third process, two molecules of a penta-O-protected-epicatechin or -catechin monomer activated with a 2-(benzothiazolyl)thio group at the C-4 position are self-condensed in the presence of silver tetrafluoroborate. An improved two-step process for preparing a C-4 alkoxy activated tetra-O-benzyl-protected, 8-bromo-blocked-epicatechin or -catechin monomer is also provided. The use of naturally-derived and synthetically-prepared procyanidin (4β,8)₄-pentamers to treat cancer is also disclosed.

A production method of high purity silver tetrafluoroborate, capable of producing silver tetrafluoroborate (AgBF₄) at purity higher than the conventional, without using an organic solvent. The production method of the present invention is characterized in that the method comprises the step of: reacting silver fluoride with boron trifluoride in the presence of anhydrous hydrofluoric acid. Boron trifluoride is delivered into a solution obtained by dissolving or suspending silver fluoride in an anhydrous hydrofluoric acid solution.

The invention relates to a preparation method of silver tetrafluoroborate, which comprises the steps of mixing and reacting a fluoboric acid source and silver salt in a reaction medium to obtain the silver tetrafluoroborate, wherein the fluoboric acid source is selected from at least one of tetrafluoroborate and tetrafluoroboric acid; and the reaction medium is a mixed solvent of a first organic solvent and water or water, and the first organic solvent is selected from at least one of diethyl ether, nitromethane and methylbenzene. The preparation method is wide in raw material applicability, the raw materials are low in toxicity and easy to obtain, the problem that the toxicity is too high when silver fluoride and boron trifluoride serve as reaction raw materials is solved, the reaction can be carried out at the room temperature, the reaction condition is mild, the reaction is easy to operate, the needed time is short, the requirement for equipment is low, and the production safety problem is guaranteed.

The invention belongs to the technical field of precious metal preparation, and relates to a method for preparing bis(norbornadiene)rhodium tetrafluoroborate. A red bis(norbornadiene)rhodium tetrafluoroborate solid is obtained by subjecting rhodium trichloride hydrate and norbornadiene serving as raw materials to an ion exchange reaction with silver tetrafluoroborate in an inert gas protection environment and carrying out filter pressing. The preparation method is simple, the yield and the purity of a bis(norbornadiene)rhodium product are improved, and production cost is reduced.

The invention discloses a preparation method of vinorelbine tartrate, which comprises the following steps: 1) preparation of dehydrated vinblastine: taking vinblastine sulfate and vindoline as initialraw materials, and carrying out ferric trichloride catalysis and sodium borohydride reduction to obtain dehydrated vinblastine; 2) preparation of bromo-dehydrated vinblastine: carrying out bromination reaction on dehydrated vinblastine and N-bromo-succinimide to obtain a bromo-dehydrated vinblastine crude product; carrying out column purification on the bromo-dehydrated vinblastine crude productto improve the purity of the bromo-dehydrated vinblastine crude product so as to obtain bromo-dehydrated vinblastine; 3) preparation of vinorelbine: carrying out debromination rearrangement on bromo-dehydrated vinblastine and a silver tetrafluoroborate aqueous solution to obtain a vinorelbine crude product; and recrystallizing the vinorelbine crude product to obtain a vinorelbine pure product; and4) preparation of vinorelbine tartrate: carrying out a salt forming reaction on the pure vinorelbine tartrate and tartaric acid to obtain vinorelbine tartrate. The method has the advantages of simpleoperation, few side reactions, great increase of the purity and the yield, reduction of the production cost, and suitableness for large-scale production.

The invention provides a tricyclohexylphosphine-5-fluorouracil-1-acetic acid mononuclear silver coordination compound, a preparation method and application thereof, and belongs to the technical field of silver compounds. The mononuclear silver coordination compound is prepared by taking 5-fluorouracil-1-yl acetic acid, silver tetrafluoroborate and tricyclohexylphosphine as raw materials and reacting in the presence of triethylamine. According to the invention, one unit cell of the compound contains two same asymmetric structural units, and a central metal silver ion is respectively coordinated with a phosphorus atom in tricyclohexylphosphine and a 5-fluorouracil-1-yl acetic acid anion; researches show that the interaction mode of the mononuclear silver coordination compound and CT-DNA is an electrostatic mode, and the binding constant K of the mononuclear silver coordination compound and calf thymus DNA is 3.03*10<3> L/mol, so that the cytotoxicity is greatly reduced; and an anti-cancer activity experiment shows that the anti-cancer effect of the mononuclear silver coordination compound on MDA-MB-231 and HCT116 is remarkably enhanced compared with that of 5-fluorouracil, and particularly, the effect is better after infrared irradiation.

The invention relates to a silver nanowire and a preparation method and application thereof. The preparation method of the silver nanowire comprises the following steps that silver salt is dissolved in a first solvent, a first mixture is obtained, the silver salt is selected from at least one of silver trifluoromethanesulfonate, silver diethyl dithiocarbamate and succinimide silver salt, and the first solvent is water; a seed crystal, a reducing agent and a dispersing agent are dissolved in a second solvent at the temperature of 48-72 DEG C, a second mixture is obtained, the seed crystal is selected from at least one of tri-silver citrate or silver tetrafluoroborate, and the second solvent is water; and the first mixture and the second mixture are mixed in a dropwise adding manner, the pHis adjusted to 8-8.5, solid-liquid separation is carried out, and the silver nanowire is obtained. By means of the preparation method, the silver nanowire with the good bending resistance and the longlength-diameter ratio can be obtained.

The invention discloses a surface treatment process of an integrated circuit lead frame. The surface treatment process is characterized by mainly comprising the following steps of oil removal, acid activation, copper plating, silver-tin alloy plating, copper protection, surface treatment and post-treatment. The surface treatment process has the advantages that copper tetrafluoroborate is used as main salt of a copper plating solution, silver tetrafluoroborate and stannous fluoroborate serve as main salt of a silver-tin alloy plating solution, the plating solution does not contain cyanide, is simple in component, healthy and friendly to the environment and workers, reasonable in formula and good in solution stability, on the premise that the quality of a plating layer is guaranteed, the current density is large, the electroplating speed is high and can reach 10 m/min, the electroplating efficiency is high, and the obtained integrated circuit lead frame is high in weldability, uniform in thickness, consistent in brightness, suitable for industrial production and cyclic utilization of liquid medicines, and conforms to the concept of green and environment-friendly production.

The invention provides a monovalent silver-catalyzed synthesis method for an azaindole seven-membered ring, belonging to the field of organic synthesis. In a general reaction formula as described in the specification, R1, R2 and R3 are as defined in the claims and the specification. A silver catalyst needed in a reaction is one selected from a group consisting of silver trifluoromethanesulfonate,silver hexafluoroantimonate, silver tetrafluoroborate and silver bis(trifluoromethanesulfonimide). A medium needed in the reaction is toluene. The reaction is carried out at room temperature under thecondition of stirring. The method has the advantages of easy availability of raw materials, simple operation, a wide application scope, good atomic economy, green reaction, and low price.

The invention relates to a preparation method of tetrakis (acetyl nitrile) silver tetrafluoroborate, which comprises the following steps: mixing and dissolving silver nitrate and acetonitrile to prepare a first reaction solution; and mixing the first reaction solution with ammonium fluoroborate for reaction to prepare the tetrakis (acetylacetonitrile) silver tetrafluoroborate. According to the preparation method of tetrakis (acetylacetonitrile) silver tetrafluoroborate provided by the invention, proper silver salt and fluoroborate are selected as raw materials, and acetonitrile, which is one of the reaction raw materials, is directly used as a reaction solvent, so that the tetrakis (acetylacetonitrile) silver tetrafluoroborate prepared by the method has few impurities, and the tetrakis (acetylacetonitrile) silver tetrafluoroborate has excellent storage stability through test verification; deterioration is avoided after long-time storage. Meanwhile, the preparation method also realizes maximization of reaction atom economy, meets the requirements of sustainable development of the modern society, is simple to operate and low in production cost, and has a great industrial application prospect.