Method for synthesizing light-sensitive material 2,3,4,4'-Tetrahydroxybenzophenone

Abstract

The invention provides a method for synthesizing a light-sensitive material 2,3,4,4'-Tetrahydroxybenzophenone, which comprises the following steps: mixing and putting pyrogallic acid and p-hydroxybenzoic acid in a molar ratio of 1:1.0-1.5 into an enamel reaction pot, adding a composite catalyst accounting for 4 to 6 times of raw materials into the mixture to perform reaction for 2 to 10h at the temperature of between 60 DEG C and 120 DEG C, then cooling and filtering the obtained product, washing the obtained filter cake twice respectively by using alkaline solution and purified water, dissolving the obtained crystals in 20 to 40 percent ethanol for recrystallization, carrying out centrifugal filtration on the crystals, then washing the filtrated crystals by using the purified water, and then carrying out vacuum drying on the crystals at the temperature of between 40 and 50 DEGC to obtain the 2,3,4,4'-Tetrahydroxybenzophenone. According to the method, the pyrogallic acid as the raw material for synthesis is generated through the decarboxylation of a gallic acid (a native compound), thus, the method has the advantages of easy preparation, short synthesis process flow, low production cost and small environmental impact.

Description

technical field [0001] The present invention relates to the field of fine chemical industry, specifically, it provides a method for synthesizing 2,3,4,4'-tetrahydroxybenzophenone from natural product gallic acid derivatives as main raw materials. Background technique [0002] 2,3,4,4'-Tetrahydroxybenzophenone is a derivative of benzene ring acylation after decarboxylation of gallic acid to form pyrogallic acid. It is an important organic intermediate and can be used in the microelectronic integrated circuit industry Photoresists, pharmaceutical intermediates, UV absorbers, resin stabilizers, dyes, etc. It is mainly used in the production of UV positive photolithography with micro-processing line widths of 0.3-0.8um in microelectronics and flat panel displays Glue, in recent years, with the development of the liquid crystal display panel industry, the market demand is strong. [0003] The synthesis of 2,3,4,4'-benzophenone can be obtained through the Friedel-Crafts acylation...

AI Technical Summary

Problems solved by technology

Among them, the resin catalysis method takes a long time to regenerate the resin, the process is complicated, and it is difficult to industrialize large-scale production; although the process of the boron trifluoride ether catalysis method is relatively simple, the residual metal ion content of the product is high, which cannot meet the requirements of the microelectronics industry.