44 results about "Caesium fluoride" patented technology

The invention relates to brazing aluminum steel and a cesium and rubidium containing brazing flux thereof and belongs to the field of brazing materials in non-metal materials. The brazing flux comprises, by a mole ratio, 0.01 mol to 0.56 mol of rubidium fluoride (RbF), 0.15 mol to 0.58 mol of cesium fluoride (CsF), 0.001 mol to 0.25 mol of aluminum oxide (Al2O3), 0.001 mol to 0.2 mol of potassium fluoride (KF), 0.002 mol to 0.05 mol of gallium fluoride (GaF3), 0.001 mol to 0.025 mol of lithium fluoride (LiF), 0.001 mol to 0.025 mol of boron fluoride (BF3), and the balance aluminum fluoride (AlF3). According to the brazing aluminum steel and a cesium and rubidium containing brazing flux thereof, brazing technical requirements of aluminum to aluminum, aluminum to copper, and aluminum to steel can be simultaneously met, and the high-activity novel soldering flux is achieved.

The invention discloses a caesium rubidium soldering flux containing gallium oxide, belonging to the brazing material field of non-metallic materials. The caesium rubidium soldering flux containing gallium oxide is characterized in that the caesium rubidium soldering flux containing gallium oxide comprises the following components in proportion in mole number: 0.12-0.5 mole of rubidium fluoride (RbF), 0.12-0.5 mole of cesium fluoride (CsF), 0.001-0.2 mole of aluminium oxide (Al2O3), 0.001-0.02 mole of potassium fluoride (KF), 0.0001-0.02 mole of gallium oxide (Ga2O3), and 0.159-0.479 mole of aluminium fluoride (AlF3). According to the caesium rubidium soldering flux containing the gallium oxide, the requirement on brazing the aluminium-copper, the aluminium-steel and the aluminium-aluminium can be satisfied simultaneously and the caesium rubidium soldering flux containing gallium oxide has high activity.

The invention discloses a self-brazing material for welding an aluminum-copper member. The self-brazing material comprises the following components: 12-15 percent of fluoride (30-80 percent of aluminum fluoride, 5-35 percent of caesium fluoride and the balance of potassium fluoride), 0.01-0.3 percent of hafnium, 0.01-0.8 percent of germanium, 0.05-2 percent of nickel, 0.8-3 percent of copper, 5-17 percent of silicon and the balance of aluminum. The self-brazing material is prepared through the following steps of: smelting and atomizing the raw materials of hafnium, the germanium, the nickel, the copper, the silicon and the aluminum in a vacuum furnace into fine powder; and then uniformly mixing with the fluoride, pressing into a composite ingot, directly extruding the composite ingot into a yarn or pipe, and winding the yarn into a coil or cutting the pipe into a ring to obtain the self-brazing material. The self-brazing material disclosed by the invention has the advantages that trace elements of Ge and Hf are introduced on the basis of the traditional Al-Si-Cu-Ni alloy system brazing material, so that the brazing material smelting temperature is lowered, the burning loss of an aluminum base material during welding is favorably avoided, the strength and plasticity of the brazing material are improved, the mechanical property of a brazing joint is favorably improved, and the improvement of the plasticity of the brazing material can ensure that the production efficiency is increased.

The invention relates to the field of brazing materials, in particular to fluoride brazing flux for copper-aluminum dissimilar metal and a preparation method for the fluoride brazing flux. The fluoride brazing flux consists of cesium fluoride, aluminum trifluorid, potassium fluoride, copper difluoride and assistant. The preparation method comprises the following steps: mixing the cesium fluoride, the aluminum trifluorid, the potassium fluoride, the copper difluoride, zinc difluoride and lithium fluoride powder with zinc powder or ZnAl alloyed powder in proportion, adding a proper amount of deionized water and grinding in a mortar to form paste, and then, drying and grinding.

The invention relates to medium-temperature type anti-corrosion fluoroaluminate soldering flux and a preparation method thereof. The soldering flux takes lithium-settling mother liquor obtained by extracting lithium from Jiangxi lepidolite as a base solution; the base solution is subjected to impurity removal to obtain a solution rich in k, Rb and Cs as a raw material solution; one or more of aluminum fluoride, potassium fluoride, rubidium fluoride and cesium fluoride are dosed and added to prepare mixed type soldering flux; the added metal salts can be extracted from the lepidolite. The lepidolite is rich in rubidium and cesium, so that the production cost of the novel soldering flux is greatly reduced, and the Jiangxi lepidolite realizes resource maximum utilization. The medium-temperature type anti-corrosion fluoroaluminate soldering flux is suitable for welding aluminum alloy and high-magnesium alloy, and has special activity on alloy with high magnesium content.

The invention belongs to the technical field of fine chemicals and related chemistry, and provides an efficient preparation method of a 1-aryl-4-butene compound. The 1-aryl-4-butene compound can be obtained by taking halogen-containing methyl aromatic hydrocarbon and derivatives thereof as raw materials, taking cesium fluoride as an alkali in the presence of a palladium catalyst and a ligand and reacting with allyl boronic acid pinacol ester for 12 hours at the temperature of 80-100 DEG C under the condition of an anhydrous organic solvent. The method has the beneficial effects that the selectivity is high, the reaction conditions are mild, the operation is simple and convenient, the possibility of industrialization is realized, and the 1-aryl-4-butene compound is obtained at a relativelyhigh yield; the 1-aryl-4-butene compound synthesized by the method can be further functionalized to obtain various compounds, and is applied to development and research of natural products, functionalmaterials and fine chemicals.

The invention relates to a method for preparing chlorine fluorine cyclopentene isomeride in the formula (II) (please see the formula in the specification). The chlorine fluorine cyclopentene isomeride is obtained with chlorine fluorine cyclopentene in the formula (I) (please see the formula in the specification) as the raw material in solvent dimethylformamide, dimethyl sulfoxide or sulfolane by conducting an isomerization reaction in catalysts ammonium fluoride, ammonium bifluoride, potassium fluoride, lithium fluoride, sodium fluoride, rubidium fluoride or cesium fluoride. The technological method is little in raw material toxicity and mild in reaction conditions, the reaction is easy to control, the isomeride yield of chlorine fluorine cyclopentene is high, and industrialization is easy.

The invention provides a ferrocenyl-containing arylamine compound and a synthesis method thereof. A trifluoromethanesulfonic acid-2-(trimethylsilyl) phenyl ester compound is used as a benzyne precursor, cesium fluoride is used as an alkali, 18-crown-6-ether is used as a phase transfer catalyst, and a ferrocenyl arylamine structural unit is efficiently constructed through a one-pot reaction under the condition of no additional metal catalyst. The reaction overcomes the defects that a transition metal or noble metal catalyst needs to be added in the conventional reaction, the requirements on a substrate and reaction conditions are harsh and the like, the reaction is simple in substrate synthesis, reagents are easy to obtain, target molecules are obtained simply and quickly with high atom economy, and a brand-new way is provided for developing the ferrocenyl-containing arylamine compound.

The invention provides a synthesis method of 1,1,2-trichloro-3-fluoropropylene, comprising the following step: in the presence of a polyalcohol solvent, carrying out a reaction on 1,1,2,3-tetrachloropropene and an alkali metal fluoride at 90-120 DEG C for 1.0-10h to obtain 1,1,2-trichloro-3-fluoropropylene. The molar ratio of the alkali metal fluoride to 1,1,2,3-tetrachloropropene is (1-5):1, wherein the alkali metal fluoride is sodium fluoride, potassium fluoride or cesium fluoride; and the polyalcohol is glycol, 1,2-propanediol, 1,3-propanediol, 2,3-butanediol, diethylene glycol, triethylene glycol, tetraethylene glycol or glycerol. The synthesis method provided by the invention is mainly applied to preparing 1,1,2-trichloro-3-fluoropropylene.

The invention discloses a preparation method of a 1, 4 enyne compound, which comprises the following steps of in an inert gas atmosphere, adding allyl alcohol, acetylenic acid and a combined catalyst into an organic solvent, and stirring and reacting for 12-24 hours at the temperature of 80-100 DEG C to obtain a reaction solution, wherein the combined catalyst is prepared from organic palladium, villiaumite and cesium fluoride, and the villiaumite is bis (trifluoromethanesulfonimide) salt or bis (trifluoromethanesulfonate), and extracting the reaction solution by using water and ethyl acetate to remove part of the reaction solvent, drying and concentrating an organic phase, and purifying by using a petroleum ether/ethyl acetate developing solvent system through thin layer chromatography to obtain the 1, 4-eneyne compound. The preparation method is simple and convenient to operate, the obtained by-products only comprise water and carbon dioxide, and the method has the advantages of being high in atom economy and environmentally friendly; in addition, the preparation method is low in raw material price and wide in applicable substrate range.

The invention belongs to the field of catalysts, and particularly relates to a modified silicon dioxide mesoporous catalyst and a preparation method thereof. The preparation method comprises the following steps: (1) dissolving cetyl trimethyl ammonium bromide (CTAB) in distilled water, stirring for 30 minutes at room temperature, and then sequentially adding ammonia water and tetraethoxysilane (TEOS) to obtain a post-mixed solution; 2) adding a cesium fluoride solution and a silver nitrate solution into the mixed solution obtained in the step 1); stirring at room temperature; and 3) adding themixture obtained in the step 2) into a reaction kettle containing a polytetrafluoroethylene lining, crystallizing, taking out the sample, carrying out suction filtration, washing and drying, and carrying out high-temperature roasting in a muffle furnace. In the preparation process of the modified silicon dioxide mesoporous catalyst, due to the fact that one-step synthesis is adopted, cesium fluoride and silver oxide directly enter the skeleton structure of the catalyst carrier, and uniform distribution of cesium fluoride and silver oxide components is guaranteed.

The invention discloses a synthesis method and anticancer activity of a 4-amino dihydroquinolinone compound, which belongs to the technical field of organic synthesis and drug discovery. 2-(trimethylsilyl) aryl trifluoromethanesulfonate 1 and a 1-substituted pyrazolidinone compound 2 are used as raw materials and react in an organic solvent in the presence of a catalyst and cesium fluoride to obtain the 4-amino dihydroquinolinone compound 3, and the compound shows remarkable anti-proliferative activity on cancer cells such as REC-1 and Ramos. The synthesis method disclosed by the invention has the advantages of wide substrate range, mild reaction conditions, good functional group tolerance and the like, and the obtained product has potential medicinal value.

The method discloses a gamma-amino acid analogue and a synthesis method thereof. The method comprises the following steps of adding a photosensitizer, alkali and carboxylic acid into a dry reaction tube, adding a solvent and a reaction substrate under the atmosphere of protective gas, reacting under the irradiation of visible light, carrying out acidification quenching treatment on the mixture obtained by the reaction after the reaction of the raw materials is finished, and separating and purifying to obtain a product gamma-amino acid analogue. The photosensitizer comprises Ir[dF(CF3)(ppy)]2(dtbbpy).PF6, Ir(ppy)2(dbbpy).PF6, 4CzIPN, and the alkali is cesium fluoride, cesium carbonate or potassium fluoride; the additive is a molecular sieve; and the reaction substrate is an alkene compound.The gamma-amino acid analogue is efficiently and highly selectively synthesized under the atmosphere of visible light induction and protective gas. According to the scheme, reaction conditions are mild, reaction substrate selectivity is wide, and the reaction substrate selectivity is amplified to the gram-level scale.