5 results about "Ethyl iodide" patented technology

The application discloses a preparation method of triethyl indium, and relates to the technical field of metal organic source synthesis, wherein a commonly used indium source is mainly trimethyl indium; the trimethyl indium is in a solid state at normal temperature, and is easy to cause the solid indium source to be easy to be hardened and to have excessive residues; when the solid indium source is used in a machine, the concentration output stability is worse than that of a liquid source; the liquid indium source will become an important indium source in the future; the operation method of the triethyl indium in preparation is more complicated; and the purity of the triethyl indium prepared by purification cannot reach a better ideal state. In the application, n-butyllithium and ethyl iodide are reacted under the protection of inert gas, then the reaction product is reacted with indium chloride to generate triethyl indium; the whole operation is simple, raw materials are easy to obtain, and the product has high purity; under the protection of inert gas, the interference of other solution reagents in the preparation process is reduced; therefore, high-quality triethyl indium raw materials can be purified and processed.

The invention discloses a synthesis method of N-ethyl-3-chloro-4-iodo-pyrazole, which comprises the following steps: reacting pyrazole with an acetylation reagent to generate N-acetyl pyrazole; the method comprises the following steps: reacting N-acetylpyrazole with a chlorination reagent in the presence of alkali and an activating agent to generate N-acetyl-3-chloropyrazole; the preparation method comprises the following steps: enabling N-acetyl-3-chloropyrazole to react with an iodination reagent, so as to generate N-acetyl-3-chloro-4-iodinated pyrazole; the preparation method comprises the following steps: enabling N-acetyl-3-chloro-4-iodine pyrazole to react with a reducing agent, so as to generate N-ethyl-3-chloro-4-iodine-pyrazole. By adopting an acetyl protection / reduction innovative strategy, a high-crisis diazotization process and a difficult-to-control iodoethane alkylation reaction are avoided, efficient and high-selectivity synthesis of N-ethyl-3-chloro-4-iodo-pyrazole by taking cheap pyrazole as a raw material is realized, the whole reaction route is simple and safe, the product purity and yield are remarkably improved, and the method is suitable for industrial production. And the method is more suitable for industrial large-scale production.

The invention discloses plant-based hairline cream and a preparation method thereof, and relates to the technical field of cosmetics. When the plant-based hairline cream is prepared, black sesame is cleaned and crushed, and then the crushed black sesame reacts with a sodium hydroxide solution and a hydrochloric acid solution in sequence to obtain black sesame pigment; coating the nanometer perlite powder loaded with the black sesame pigment with ethyl orthosilicate to obtain silicon dioxide coated nanometer perlite powder; the preparation method comprises the following steps: sequentially reacting carboxymethyl cellulose with 2-iodoethane-1-amine and imidazole-4-methyl formate to obtain imidazolium salt cellulose; and finally emulsifying glycerol, sodium hyaluronate, 1, 3-butanediol, vitamin E, sweet almond oil, imidazolium salt cellulose and liquid paraffin, uniformly mixing with the silicon dioxide coated nano perlite powder, and standing to prepare the plant-based hairline cream. The plant-based hairline cream prepared by the invention has excellent makeup holding capacity, moisturizing capacity and antibacterial capacity.

The invention relates to a selective hydrogenation reduction method of a non-conjugated ketene compound, which comprises the following steps: in a nitrogen atmosphere, mixing a ketene compound shown as a formula (I), a hydrogen source, a catalyst, a ligand, a reducing agent and an organic solvent, and stirring at room temperature for 8-24 hours to obtain a reaction solution; and performing column chromatography separation and purification on the reaction liquid to obtain the alkyl ketone compound as shown in the formula (II). According to the method, iodoethane or bromoethane is used as a hydrogen source, and compared with the prior art, the method has the advantages of higher yield, mild reaction conditions, good selectivity, no need of high-pressure hydrogen, no pungent smell and environmental protection.

This invention belongs to the field of fine chemical engineering and organic synthesis technology, and relates to a method for preparing high-purity 1,1-difluoro-2-iodoethylene. The method includes: firstly, in an aprotic organic solvent, under controlled low-temperature conditions, allowing vinylidene fluoride to undergo an addition reaction with iodine monochloride to obtain the intermediate 1-chloro-1,1-difluoro-2-iodoethane; subsequently, the intermediate undergoes a controlled elimination reaction in an alkaline aqueous solution, and the product is immediately removed by reactive distillation, finally purified by distillation to obtain the target product. This invention effectively controls the thermal effect of the addition reaction by introducing a specific solvent, suppressing side reactions such as iodine radical coupling, and eliminating the need for expensive metal catalysts or phase transfer catalysts. The process is simple and safe to operate, with an intermediate separation yield of over 95%, high overall yield, and high product purity, making it suitable for large-scale industrial production.