56results about How to "React green" patented technology

The invention discloses a platinum alloy catalyst, its preparation method and its application in a fuel cell cathode catalyst. The method comprises: 1) preparing a mixed solution of the first reducing agent glucose and the precursor of the first metal component platinum; 2. ) under the condition that the pH value of the mixed solution is 3-10, heating and adding a carbon carrier, and raising the temperature to 80-95°C for reaction; 3) adding the precursor of the second metal component, and reacting; 4) cooling and separating the reaction product; 5) Dissolving the reaction product in water, adding a second reducing agent, heating to 80-95°C, and reacting; 6) cooling and separating the reaction product to obtain a catalyst precursor; 7) calcining to obtain a platinum alloy catalyst. The preparation method of the present invention does not require a large amount of organic solvents, and the reaction conditions are mild. In the aqueous solution, non-toxic and mild glucose is used as the main reducing agent, and a second mild reducing agent is introduced to further coordinate dispersion and reduction to prepare a high-efficiency hydrogen fuel cell. catalyst. It has broad application prospects in the field of fuel cell catalysts.

The invention discloses a method for synthesizing perfluoroalkyl-substituted polycyclic quinazolinone derivatives, which combines the quinazolinone derivatives containing inactive double bonds represented by formula (I), and the quinazolinone derivatives represented by formula (II The sodium perfluoroalkyl sulfinate shown in ) is dissolved in a solvent, and the reaction is carried out under open conditions. Under the irradiation of visible light, the reaction is carried out at room temperature for 3‑24 h. After the reaction is completed, the reaction system is post-treated to obtain the formula ( III) Perfluoroalkyl substituted polycyclic quinazolinone derivatives; the reaction equation is as follows: the present invention uses light as a reaction energy source, and realizes quinazolinone containing inactive double bonds without any additives. The perfluoroalkylation / cyclization reaction of oxazolinones has the advantages of safe process, low cost and simple operation, and provides a green synthesis method of perfluoroalkyl-substituted polycyclic quinazolinone derivatives.

The invention discloses a synthesis method of C-3 alkyl-substituted coumarin derivatives, which combines the coumarin derivatives represented by the formula (I), the coumarin derivatives represented by the formula (II) N ‑alkanoyloxyphthalimide compound, photocatalyst and protonic acid are dissolved in an organic solvent, and reacted at 20‑60°C for 3‑36 h under visible light irradiation. After the reaction, the reaction system After post-processing, the C-3 alkyl-substituted coumarin derivative target product shown in formula (III) is obtained; the reaction formula is as follows: In formula (I) and formula (III), the substituent R 1 Is H, methyl, methoxy, fluorine, chlorine or bromine; in formula (II) and formula (III), substituent R 2 It is C1-C8 linear alkyl or cycloalkyl. The invention realizes the C-3 alkylation of coumarin by using light as the reaction energy, makes the reaction safer, greener, and lower in cost, expands the scope of application of the substrate of the reaction, and enriches the coumarins substituted by C-3 Compound synthesis method.

The invention discloses a synthesis method of a C-3-position difluoromethyl-substituted quinoxalinone derivative. The method comprises the steps of dissolving a quinoxalinone derivative, a bromodifluoromethyl compound, a photocatalyst, an inorganic base and an organic amine in an organic solvent for a reaction for 6-36 hours at the temperature of 20-60 DEG C under the irradiation of visible light;after the reaction is finished, carrying out posttreatment on a reaction system to obtain a target product, namely the C-3-position difluoromethyl-substituted quinoxalinone derivative. According to the method, light is adopted as a reaction energy source to realize C-3 difluoro methylation of quinoxalinone, so that the reaction is safer, environmentally friendly and lower in cost, the applicationrange of reaction substrates is expanded, and synthesis methods of C-3 substituted quinoxalinone compounds are diversified.

The invention discloses a photocatalytic oxidation synthesis method of diphenylmethanol ester. The method is characterized in that diphenylmethanol and carboxylic acid are used as reaction substrates,2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ) and tert-butyl nitrite (TBN) are used as a catalyst, and oxygen is used as an oxidant, in the presence of 3A or 4A molecular sieves, the reaction substrates react in the 1,2-dichloroethane solvent under conditions of room temperature, normal pressure and blue light irradiation, and after the reaction ends, a diphenylmethanol ester compound is obtained by separation treatment. According to the invention, by replacing the traditional heating reaction with light reaction, the energy is saved; and the reaction is environmentally friendly by using oxygen as the oxidant.

The present invention relates to the technical field of drug synthesis, in particular to a method for preparing 2,4,6-triiodoresorcinol, that is, in sulfuric acid methanol solution, using resorcinol as a substrate, potassium iodide as an iodine reagent, and dropping Hydrogen peroxide aqueous solution is added, and the highly active, nascent atomic iodine and resorcinol generated by the oxidation of potassium iodide by hydrogen peroxide react to produce products; the by-products are water and inorganic salts. The method for synthesizing iodophenol of the present invention is an oxidation iodization process, and the highly active iodide iodine chloride generated in the process is immediately generated and consumed by iodine immediately, and the by-products of the reaction are water and potassium sulfate; the reaction is green, efficient, and Safe and controllable.