Synthetic method of tetrafluthrin intermediate

The invention discloses a synthetic method of a tetrafluthrin intermediate, namely a preparation method for recycling 2, 3, 5, 6-tetrafluoro-p-xylylene dimethyl ether (a byproduct for short), and belongs to the technical field of organic synthesis. The method comprises the following steps: reacting by-products in a mixed solution of inorganic strong acid and organic acid, carrying out hydrolysis reaction on the obtained mixture under the action of inorganic alkali, reacting a hydrolysis product with a methylation reagent, and finally separating and purifying to obtain the 2, 3, 5, 6-tetrafluorobenzyl alcohol. According to the method, byproducts are recycled, the cost is reduced, the generation of solid wastes is reduced, and meanwhile, the method has the advantages of cheap and easily available raw materials, mild reaction conditions, simple reaction operation, high synthesis yield, good product quality and the like, and has very high industrial production economic value. 本发明公开了一种四氟醚菊酯中间体的合成方法，2,3,5,6四氟对苯二甲醚(