The invention relates to 4, 4apos; synthesis method of-dihydroxybiphenyl

By hydrogenating and reducing 4,4'-dinitrobiphenyl to 4,4'-diaminobiphenyl, and then synthesizing 4,4'-dihydroxybiphenyl through the hydrolysis of silica-grafted modified multibranched carboxylic acid polymers, the problems of high raw material cost, complex process, and difficult purification in the existing technology are solved, and efficient and environmentally friendly industrial production is realized.

CN121990878APending Publication Date: 2026-05-08QINGDAO UNIV OF SCI & TECH
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Patent Information

Application Number
CN202610031217.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-01-12
Publication Date
2026-05-08

AI Technical Summary

Technical Problem

Existing technologies for synthesizing 4,4'-dihydroxybiphenyl suffer from problems such as high raw material costs or high toxicity, complex process routes, harsh conditions, low selectivity and yield, and difficulty in product purification, making it difficult to achieve large-scale production.

Method used

Using 4,4'-dinitrobiphenyl as a raw material, 4,4'-diaminobiphenyl is generated by hydrogenation reduction, and then hydrolyzed under the action of silica-grafted modified multibranched carboxylic acid polymer to generate 4,4'-dihydroxybiphenyl. This simplifies the process, reduces the risk of environmental pollution, and improves reaction efficiency and selectivity.

Benefits of technology

It significantly shortens reaction time, improves the yield and selectivity of 4,4'-dihydroxybiphenyl, reduces impurity content, simplifies purification steps, is suitable for industrial production, and reduces the risk of environmental pollution.

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Abstract

The invention discloses a synthetic method of 4, 4 '-dihydroxybiphenyl. The method comprises the following steps: mixing 4, 4 '-dinitrobiphenyl, a metal catalyst and an organic solvent, introducing hydrogen, and carrying out hydrogenation reduction reaction to obtain 4, 4'-diaminobiphenyl; the preparation method comprises the following steps: mixing 4, 4 '-diaminobiphenyl and a silicon dioxide grafted modified multi-branched carboxylic acid polymer, carrying out a heating reaction, and removing a solvent from a reaction solution to obtain 4, 4'-dihydroxybiphenyl. 4, 4 '-dinitrobiphenyl is used as a substrate of the reaction, and an intermediate 4, 4'-diaminobiphenyl is obtained after hydrogenation reduction; the target product 4, 4 '-dihydroxybiphenyl is synthesized by taking the silicon dioxide grafted and modified multi-branched carboxylic acid polymer as a hydrolysis reagent, so that the efficiency and selectivity of the reaction for preparing the 4, 4'-dihydroxybiphenyl are effectively improved, the reaction condition is mild, the operation process is simple and convenient, and the method has wide industrial application potential.
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