3,5-dihydroxy toluene (DHT) which is widely used in the field of medicine is an anti-inflammatory drug and an important intermediate for organic synthesis. In this paper, in order to find a method that is suitable to industry, p-toluidine is used for the synthesis of DHT. The value and development of the phenolic compounds are described in the first part of this paper, and the value of DHT is described in detail. Various of synthetic methods of DHT are analyzed the advantages and disadvantages. At last, a n...