Method for preparing 2, 2'-(4,4'-distyrylphenyl) phenylene benzobisoxazole competitive product

The invention discloses a method for preparing a 2, 2'-(4,4'-distyrylphenyl) phenylene benzobisoxazole competitive product. The method comprises the steps of condensation reaction, sulfurization reaction, refining, solid-liquid separation and the like. In the refining step of a crude product, the crude product is refined and desulphurized under the effect of 30% NaOH solution, the desulphurization rate is high, the purity of the product OB-1 can reach 99 percent, the yield is high, the quality is good, the color is bright, and the application performance is greatly improved; after the traditional dimethylbenzene is substituted by 30% NaOH solution to be used as the desulphurization washing agent, the production safety coefficient is high, safety in operation is realized, and the cost is low. The method can be used for preparing fluorescent whitening agent OB-1 which is used as an auxiliary material for the materials such as plastics, paint, road line paint and the like.