Preparation process of 4,4-dihydroxybiphenyl

Abstract

4,4'-Dihydroxybiphenyl is prepared by decomposing 4,4'-di(2-hydroxy-2-propyl)biphenyl with hydrogen peroxide and an acid catalyst in acetonitrile as a solvent. Especially, this process minimizes the formation of by-products and permits easy purification of the intended product.

What is claimed is: 
     
       1. A process for the preparation of 4,4'-dihydroxybiphenyl, which comprises decomposing 4,4'-di(2-hydroxy-2-propyl)biphenyl at a reaction temperature in a range of from 20° C. to the boiling point of acetonitrile with 2-3 times (in molar ratio) of hydrogen peroxide and 0.005-5 times (in weight ratio) of an acid catalyst in .[.2-3 volumes/weights of.]. acetonitrile as a solvent .Iadd.in an amount of 3-50 times (volume (ml)/weight (g)) based on the 4,4'-di(2-hydroxy-2-propyl)biphenyl.Iaddend.. 
     
     
       2. The process as claimed in claim 1, wherein the 4,4'-di(2-hydroxy-2-propyl)biphenyl and hydrogen peroxide are mixed with the acetonitrile as the solvent and the acid catalyst is added thereafter.