3 results about "Deprotonation" patented technology

The present invention relates to a hydrazone-based covalent organic framework material, a preparation method thereof and an application thereof. An electrically neutral hydrazone-based covalent organic framework material (n-COF) is synthesized through a Schiff base reaction, and the transformation of the charge property of the framework material skeleton is realized by adjusting the acidity and alkalinity of the solution. The synthesized electrically neutral framework material has high chemical stability, is protonated under acidic conditions to obtain a positively charged framework material (c-COF), and is deprotonated under alkaline conditions to obtain a negatively charged framework material (a-COF). The hydrazone-based covalent organic framework material of the present invention has the property of adjustable framework charge and has potential application value in the fields of pollutant adsorption and photocatalytic degradation.

The present invention relates to a flame retardant preparation containing A) a cyclic phosphazene according to formula (1), where R is identical or different and in each case represents - C1- to C8-alkyl, preferably methyl, ethyl, propyl or butyl, - C1- to C8-alkoxy, preferably methoxy, ethoxy, propoxy or butoxy, - optionally C5- to C6-cycloalkyl substituted by alkyl, preferably C1-C4-alkyl, - optionally C6- to C20-aryloxy, preferably phenoxy, naphthyloxy, substituted by alkyl, preferably C1-C4-alkyl and / or hydroxy, - optionally C7- to C12-aralkyl, preferably phenyl-C1-C4-alkyl, substituted by alkyl, preferably C1-C4-alkyl, or - an OH group, and k represents 0 or an integer from 1 to 15, preferably a number from 1 to 10, B) a polymer containing structural units containing Brønsted acid groups, wherein the content of structural units containing Brønsted acid groups in component B is at least 50 wt. % and wherein at least some of the Brønsted acidic groups are deprotonated. The invention also relates to a composition containing the flame retardant mixture and a polymer, to use of the flame retardant mixture for reducing the burning drip of polymers in a flame retardant test, to a thermoplastic molding compound produced from the composition, and to molded bodies containing the composition or obtained from the thermoplastic molding compound.

The application discloses a preparation method of 4-chloropyrrolopyrimidine and belongs to the technical field of synthesis of medical intermediates. 7H-pyrrolo[2,3-D]pyrimidine is used as raw material to react with deprotonation base and boron trihalide, then selective oxidation is carried out in the presence of hydrogen peroxide, no purification is carried out, then the reaction is carried out with alkali, 7H-pyrrolo[2,3-D]pyrimidine-3-oxide is generated, finally, the reaction is carried out with phosphorus oxychloride in the presence of lithium chloride, and 4-chloropyrrolopyrimidine is obtained. In the application, 7H-pyrrolo[2,3-D]pyrimidine is used as raw material, boron trihalide is used to protect the pyrrole and the nitrogen atom at the ortho position, the oxidation yield of the target nitrogen atom can be greatly improved, the generation of by-products is reduced, the operation is simple, the overall yield is high, and the application provides a route reference for synthesizing the compounds.