Preparation method of 1, 4-dihydroxy-5, 8-dichloroanthraquinone

The invention relates to the technical field of organic synthesis, in particular to a preparation method of 1, 4-dihydroxy-5, 8-dichloroanthraquinone. According to the invention, 1, 4-dihydroxyanthraquinone is adopted as a main reaction raw material, fuming sulfuric acid is adopted as a reaction solvent, boric anhydride is adopted as a catalyst, and chlorine is introduced under the action of a cocatalyst to prepare 1, 4-dihydroxy-5, 8-dichloroanthraquinone; the acidity is improved by adopting boric anhydride, and the reaction activity is improved, the reaction temperature is reduced, byproducts are reduced, and the product purity is improved by adopting a cocatalyst. 本发明涉及有机合成技术领域，具体关于一种1,4-二羟基-5,8-二氯蒽醌的制备方法；本发明采用1,4-二羟基蒽醌为主要反应原料，发烟硫酸为反应溶剂，硼酐为催化剂，在助催化剂作用下通氯气制备1,4-二羟基-5,8-二氯蒽醌；本发明采用硼酐，提高了酸度，本发明采用的助催化剂，提高了反应活性，降低反应温度，减少副产品，提高了产品纯度。