48 results about "Benzylideneacetone" patented technology

The preparation method of plating solution for low ion content (less than 1 wt%) bright zinc-iron alloy by utilizing sulfate system is characterized by that the brightening agent of its formula is mainly formed from benzylideneacetone, polyglycol octylphenyl ether, sodium benzoate, NN-dimethyl aniline and anhydrous ethyl alcohol, and the iron content is the deposit is 0.3-0.85 wt%, and can be regulated by means of regulating ratio of Zn(2+) and Fe(2+) in the plating solution. Said preparation method is simple and reasonable, and the pH value of the plating solution using citric acid as buffer agent is stable, it can be used for surface protection and decoration treatment for plates and strips.

The invention discloses a preparation method of 4,5-difluorophthalic acid, the specific method steps are as follows: S1: Synthesis of 4,5-difluoro-1,2-phthalonitrile: add 4,5 ‑Difluoro‑1,2‑dihalobenzene and polymethylhydrogensiloxane, stirred and dissolved with N,N‑dimethylacetamide, and reacted, cooled after the reaction, and added tri( Dibenzylideneacetone) dipalladium and 1,1'-bis(diphenylphosphino)ferrocene, then slowly add zinc cyanide for reaction, after the reaction is completed, cool down and add water, and use sodium bicarbonate solution under vigorous stirring Adjust the pH to 8, stir for 2 hours and then filter, wash and elute with a mixed solvent of petroleum ether and ethyl acetate to obtain an off-white solid intermediate 4,5-difluoro-1,2-phthalonitrile; S2: Synthesis of 4,5‑difluoro‑1,2‑phthalic acid. The process of the invention is safe, efficient and easy to operate, has low requirements on equipment, low cost of raw materials, and is easy for industrialized production.

The invention discloses an aza eleven-membered ring compound, which has the following general structural formula: The invention also provides a method for preparing the compound. Under the condition of argon, using toluene as a solvent, first tris(diethylene benzylacetone) dipalladium-chloroform adduct and (4,5-bis(diphenylphosphine)-9,9-dimethylxanthene) phosphine ligand coordination, after stirring, the solution turns from red to After it turns yellow, add substrate 1 and substrate 2 to react, and the final product 3 is obtained after the reaction is completed. The invention also discloses the application of the compound and the medicine containing the compound. Its advantages are: the exploration of the compounds with the middle ring structure is further deepened, and it is found that the compounds with the middle ring structure also have pharmaceutical activity, and a preparation method capable of expanding production and large-scale production is provided. The reaction conditions of the method are easy to realize, the reaction time is shortened to the greatest extent, and high yield can be obtained at the same time.